127 results on '"Davidson LE"'
Search Results
2. Effects of exercise modality on insulin resistance and functional limitation in older adults: a randomized controlled trial.
- Author
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Davidson LE, Hudson R, Kilpatrick K, Kuk JL, McMillan K, Janiszewski PM, Lee S, Lam M, and Ross R
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- 2009
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3. Whole-body skeletal muscle mass is not related to glucose tolerance or insulin sensitivity in overweight and obese men and women.
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Kuk JL, Kilpatrick K, Davidson LE, Hudson R, and Ross R
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- 2008
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4. Association between dietary fat intake, liver fat, and insulin sensitivity in sedentary, abdominally obese, older men.
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Kuk JL, Davidson LE, Hudson R, Kilpatrick K, Bacskai K, and Ross R
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- 2008
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5. Management of central giant cell granuloma: discussion of two cases.
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Mooney GC, McMahon J, Ward SE, Davidson LE, and North S
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- 2007
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6. The effects of a long wait for children's dental general anaesthesia.
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North S, Davidson LE, Blinkhorn AS, and Mackie IC
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- 2007
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7. Rhabdomyosarcoma of the mandible in a 6-year-old boy.
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Davidson LE, Soldani FA, and North S
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- 2006
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8. Papillon-Lefèvre syndrome: a report of two cases.
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Patel S and Davidson LE
- Abstract
Papillon-Lefèvre syndrome is a rare disease characterized by skin lesions caused by palmar-plantar hyperkeratosis, and severe periodontal destruction involving both the primary and permanent dentitions. It is transmitted as an autosomal recessive condition and consanguinity of parents is evident in about one-third of cases. This paper describes two preschool children who presented at the Paediatric Dentistry Department, Sheffield, UK, with progressively loosening teeth and discomfort during eating. The medical history revealed scaling on the hands and feet, which had been medically diagnosed as eczema. Papillon-Lefèvre syndrome was diagnosed in both cases. [ABSTRACT FROM AUTHOR]
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- 2004
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9. Trends in exodontia under general anaesthesia at a dental teaching hospital
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Grant, SM, Davidson, LE, and Livesey, S
- Published
- 1998
10. Operational Criteria for the Determination of Suicide
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Rosenberg, ML, Davidson, LE, Smith, JC, Berman, AL, Buzbee, H, Gantner, G, Gay, GA, Moore-Lewis, B, Mills, DH, Murray, D, O'Carroll, PW, and Jobes, D
- Abstract
Suicide is an important public health problem for which we have an inadequate public health database. In the United States, decisions about whether deaths are listed as suicides on death certificates are usually made by a coroner or medical examiner. These certification decisions are frequently marked by a lack of consistency and clarity, and laws and procedures for guiding these decisions vary from state to state and even from county to county.Without explicit criteria to aid in this decision making, coroners or medical examiners may be more susceptible to pressures from families or communities not to certify specific deaths as suicide. In addition, coroners or medical examiners may certify similar deaths differently at different times. The degree to which suicides may be underreported or misclassified is unknown. This makes it impossible to estimate accurately the number of deaths by suicide, to identify risk factors, or to plan and evaluate preventive interventions.To remedy these problems, a working group representing coroners, medical examiners, statisticians, and public health agencies developed operational criteria to assist in the determination of suicide. These criteria are based on a definition of suicide as “death arising from an act inflicted upon oneself with the intent to kill oneself.” The purpose of these criteria is to improve the validity and reliability of suicide statistics by: (1) promoting consistent and uniform classifications; (2) making the criteria for decision making in death certification explicit; (3) increasing the amount of information used in decision making; (4) aiding certifiers in exercising their professional judgment; and (5) establishing common standards of practice for the determination of suicide.
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- 1988
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11. Severe hypodontia in an eight-year-old child
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Davidson, LE and Woolass, He
- Published
- 1985
12. Giant pulmonary hamartoma
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Davidson Les, Milton Richard, Ganti Somshekar, and Anikin Vladimir
- Subjects
Surgery ,RD1-811 ,Anesthesiology ,RD78.3-87.3 - Abstract
Abstract Pulmonary hamartomas are usually an incidental finding and range in size from 1 cm to 8 cm in diameter in various series. We report a case of a massive pulmonary hamartoma (size 25.5 × 17.5 × 6.5 cm and weighing 1134 g) in a 61 year old male who presented with a short history of breathlessness. The tumour was arising from the medial border of the right lung and occupying most of the right chest extending in to the anterior mediastinum. The tumour was compressing the right lung and there was no evidence of infiltration into the surrounding structures. It was successfully treated by surgical resection and final histology was pulmonary hamartoma with predominantly adipose and leiomyomatous differentiation.
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- 2006
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13. Sugar-free medicines: a lost opportunity?
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Holmes, A and Davidson, LE
- Published
- 1987
14. Reye's syndrome and analgesic choice in dentistry
- Author
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Holmes, A and Davidson, LE
- Published
- 1989
15. Long-Term Cancer Outcomes Following Bariatric Surgery: A Comparative Analysis of Surgical Procedures.
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Kim J, Ben-Umeh KC, Kelley J, Davidson LE, Hashibe M, Smith K, Richards N, and Adams T
- Abstract
Background/Objectives : Metabolic and bariatric surgery (MBS) is known to reduce cancer risk. However, the association between specific bariatric procedures and cancer incidence is not well-studied. This study examined the association between four different MBS procedures and cancer incidence. Methods : Bariatric surgery registry data were linked with statewide cancer registry data from 1979 to 2018. The study included 27,092 adult subjects (aged ≥ 18 years old at surgery) who underwent MBS (BMI ≥ 30 kg/m
2 at surgery) from 1979 to 2017. Cancer records were linked to MBS patient records, resulting in 1547 cancer cases. Cox proportional hazards regression was used to examine the association between MBS procedure types and cancer incidence. Results : Of all patients, 75% underwent Roux-en-Y gastric bypass (RYGB), 9% adjustable gastric banding (AGB), 10% sleeve gastrectomy (SG), and 6% duodenal switch (BPD-DS). The overall cancer incidence during the follow-up period was 6.4% for RYGB, 4.6% for AGB, 1.6% for SG, and 5.9% for BPD-DS. The mean follow-up duration from surgery to cancer incidence or censoring was 167 months (standard deviation = 121 months). Compared to RYGB, patients who underwent AGB (Hazard Ratio [HR] = 1.26, p = 0.03) and BPD-DS (HR = 1.91, p < 0.01) had a significantly higher hazard of developing cancer, while SG (HR = 1.17, p = 0.33) showed no significant difference. Conclusions : These findings suggest that AGB and BPD-DS may be associated with higher cancer risks compared to RYGB. Additional large population studies are needed to better understand the long-term cancer risks and mechanisms associated with different MBS types.- Published
- 2024
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16. Implementation of a penicillin allergy protocol in open abdominal wall reconstruction: Preoperative optimization program.
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Holland AM, Lorenz WR, Ricker AB, Mead BS, Scarola GT, Davis BR, Kasten KR, Kercher KW, Jaffa R, Davidson LE, Boger MS, Augenstein VA, and Heniford BT
- Abstract
Introduction: Beta-lactam prophylaxis is the first-line preoperative antibiotic in open abdominal wall reconstruction. However, of the 11% patients reporting a penicillin allergy (PA), most receive second-line, non-β-lactam prophylaxis. Previously, abdominal wall reconstruction research from our institution demonstrated increased wound complications, readmissions, and reoperations with non-β-lactam prophylaxis. Therefore, a collaborative quality improvement initiative was developed with the infectious disease service, and a penicillin allergy protocol was instituted that stratified patients' risk of allergic reaction with a goal to increase β-lactam prophylaxis use. The effect of the penicillin allergy protocol on open abdominal wall reconstruction outcomes was prospectively evaluated., Methods: Patients with penicillin allergy undergoing open abdominal wall reconstruction were identified and grouped according to penicillin allergy protocol implementation. Pre-penicillin allergy protocol underwent open abdominal wall reconstruction before January 1, 2020, predominantly receiving non-β-lactam prophylaxis; post-penicillin allergy protocol underwent open abdominal wall reconstruction between January 1, 2020-November 1, 2023, predominantly receiving β-lactam prophylaxis. Incidence of surgical site infection was the primary outcome. Standard and inferential statistical analyses were performed., Results: Of 315 patients with penicillin allergy, 250 underwent open abdominal wall reconstruction pre-penicillin allergy protocol and 65 post-penicillin allergy protocol. Pre- and post-penicillin allergy protocol were similar in allergic reaction severity history, sex, race, age, diabetes, American Society of Anesthesiologists score, hernia defect size, and mesh type (P > .05). Post-penicillin allergy protocol had lower body mass index (33.4 ± 7.9 vs 29.8 ± 5.3 kg/m
2 ; P = .002) and fewer active smokers (12.4% vs 1.5%; P = .019). Expectedly, post-penicillin allergy protocol received more β-lactam prophylaxis (22.8% vs 83.1%; P < .001) and no antibiotic-induced allergic reactions. Post-penicillin allergy protocol had significantly fewer surgical site infections (24.4% vs 3.1%; P < .001), wound breakdown (16.0% vs 3.1%; P = .004), reoperations (19.2% vs 0.0%; P < .001), and readmissions (25.3% vs 9.2%; P = .006) but no statistically significant reduction in recurrence (8.4% vs 1.5%; P = .057)., Conclusions: The penicillin allergy protocol safely increased the number of patients with penicillin allergy undergoing open abdominal wall reconstruction receiving β-lactam prophylaxis and decreased the rate of surgical site infections, wound complications, reoperations, and readmissions. These data supported the systemwide implementation of the penicillin allergy protocol for both general and orthopedic surgery, which has been incorporated into the electronic medical record of 13 hospitals within the system., (Copyright © 2024 Elsevier Inc. All rights reserved.)- Published
- 2024
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17. The Effect of Intranasal Plus Transcranial Photobiomodulation on Neuromuscular Control in Individuals with Repetitive Head Acceleration Events.
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Johnson PK, Fino PC, Wilde EA, Hovenden ES, Russell HA, Velez C, Pelo R, Morris AJ, Kreter N, Read EN, Keleher F, Esopenko C, Lindsey HM, Newsome MR, Thayn D, McCabe C, Mullen CM, Davidson LE, Liebel SW, Carr L, and Tate DF
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- Humans, Male, Middle Aged, Adult, Female, Aged, Adolescent, Young Adult, Acceleration, Brain Concussion radiotherapy, Proof of Concept Study, Reaction Time radiation effects, Hand Strength, Postural Balance radiation effects, Low-Level Light Therapy methods
- Abstract
Objective: This proof-of-concept study was to investigate the relationship between photobiomodulation (PBM) and neuromuscular control. Background: The effects of concussion and repetitive head acceleration events (RHAEs) are associated with decreased motor control and balance. Simultaneous intranasal and transcranial PBM (itPBM) is emerging as a possible treatment for cognitive and psychological sequelae of brain injury with evidence of remote effects on other body systems. Methods: In total, 43 (39 male) participants, age 18-69 years (mean, 49.5; SD, 14.45), with a self-reported history of concussive and/or RHAE and complaints of their related effects (e.g., mood dysregulation, impaired cognition, and poor sleep quality), completed baseline and posttreatment motor assessments including clinical reaction time, grip strength, grooved pegboard, and the Mini Balance Evaluation Systems Test (MiniBEST). In the 8-week interim, participants self-administered itPBM treatments by wearing a headset comprising four near-infrared light-emitting diodes (LED) and a near-infrared LED nasal clip. Results: Posttreatment group averages in reaction time, MiniBEST reactive control subscores, and bilateral grip strength significantly improved with effect sizes of g = 0.75, g = 0.63, g = 0.22 (dominant hand), and g = 0.34 (nondominant hand), respectively. Conclusion: This study provides a framework for more robust studies and suggests that itPBM may serve as a noninvasive solution for improved neuromuscular health.
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- 2024
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18. Does Aerobic Exercise Increase Skeletal Muscle Mass in Female and Male Adults?
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Ross R, John E, McGlory C, Davidson LE, and Stotz PJ
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- Adult, Female, Humans, Male, Body Weight, Muscle, Skeletal diagnostic imaging, Muscle, Skeletal physiology, Retrospective Studies, Randomized Controlled Trials as Topic, Dietary Proteins, Exercise physiology
- Abstract
Introduction: It is uncertain whether aerobic exercise in the form of walking contributes to the preservation or increase in total or regional skeletal muscle mass (SMM)., Purpose: This study aimed to determine the effects of aerobic exercise on total and regional (upper body verses leg SMM) in male ( n = 105) and female ( n = 133) adults with overweight and obesity., Methods: A retrospective analysis of data from four randomized controlled trials. Participants included those who completed the given trial (control, n = 63; intervention, n = 175) and with complete magnetic resonance imaging (MRI) measured adipose tissue and SMM pre- and postintervention. Macronutrient intake was assessed for a subsample of participants. Supervised exercise was performed by walking on a treadmill for durations ranging from 12 to 24 wk at intensities between 50% and 75% of V̇O 2peak ., Results: All MRI-measured adipose tissue depots were reduced, and cardiorespiratory fitness was increased by aerobic exercise compared with controls ( P < 0.001). Independent of baseline SMM, aerobic exercise was associated with a small reduction (estimated mean difference ± standard error) in whole-body SMM (-0.310 ± 0.150 kg, P = 0.039) and upper body SMM (-0.273 ± 0.121 kg, P = 0.025) compared with control. No between-group difference was observed for change in leg SMM ( P > 0.10). A negative association was observed between the relative change in body weight and change in total ( R2 = 0.37, P < 0.001), upper body ( R2 = 0.21, P < 0.001), and leg SMM ( R2 = 0.09, P = 0.701). The SMM-to-adipose tissue ratio increased in response to aerobic exercise and was positively associated with weight loss ( P < 0.001). Change in SMM was not associated with dietary protein intake ( P > 0.10)., Conclusions: Aerobic exercise performed while walking preserves, but does not increase, SMM in exercising muscle of adults. SMM not directly targeted by aerobic exercise may not be maintained., (Copyright © 2024 by the American College of Sports Medicine.)
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- 2024
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19. Weight Loss and Physical Activity for Cardiovascular Protection Among Patients With Diabetes.
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Davidson LE
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- Humans, Heart, Exercise, Weight Loss, Cardiovascular System, Diabetes Mellitus epidemiology
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- 2024
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20. Non-Destructive Monitoring of Foliar Fungicide Efficacy with Hyperspectral Sensing in Grapevine.
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Gambhir N, Paul A, Qiu T, Combs DB, Hosseinzadeh S, Underhill A, Jiang Y, Cadle-Davidson LE, and Gold KM
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- Plant Diseases prevention & control, Sulfur, Fungicides, Industrial pharmacology, Bacillus, Benzophenones
- Abstract
Frequent fungicide applications are required to manage grapevine powdery mildew ( Erysiphe necator ). However, this practice is costly and has led to widespread fungicide resistance. A method of monitoring in-field fungicide efficacy could help growers maximize spray-interval length, thereby reducing costs and the rate of fungicide resistance emergence. The goal of this study was to evaluate if hyperspectral sensing in the visible to shortwave infrared range (400 to 2,400 nm) can quantify foliar fungicide efficacy on grape leaves. Commercial formulations of metrafenone, Bacillus mycoides isolate J ( BmJ ), and sulfur were applied on Chardonnay grapevines in vineyard or greenhouse settings. Foliar reflectance was measured with handheld hyperspectral spectroradiometers at multiple days post-application. Fungicide efficacy was estimated as a proxy for fungicide residue and disease control measured with the Blackbird microscopy imaging robot. Treatments could be differentiated from the untreated control with an accuracy of 73.06% for metrafenone, 67.76% for BmJ , and 94.10% for sulfur. The change in spectral reflectance was moderately correlated with the cube root of the area under the disease progress curve for metrafenone- and sulfur-treated samples ( R
2 = 0.38 and 0.36, respectively) and with sulfur residue ( R2 = 0.42). BmJ treatment impacted foliar physiology by enhancing the leaf mass/area and reducing the nitrogen and total phenolic content as estimated from spectral reflectance. The results suggest that hyperspectral sensing can be used to monitor in-situ fungicide efficacy, and the prediction accuracy depends on the fungicide and the time point measured. The ability to monitor in-situ fungicide efficacy could facilitate more strategic fungicide applications and promote sustainable grapevine protection. [Formula: see text] Copyright © 2024 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license., Competing Interests: The author(s) declare no conflict of interest.- Published
- 2024
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21. Physiological assessment of a 16 day, 4385 km ultra-endurance mountain bike race: A case study.
- Author
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Hyldahl RD, Gifford JR, Davidson LE, Hancock CR, Hafen PS, Parcell AC, and Mack GW
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- Male, Humans, Middle Aged, Exercise physiology, Energy Metabolism, Muscle, Skeletal physiology, Bicycling, Physical Endurance physiology
- Abstract
The Tour Divide (TD) is a 4385 km ultra-endurance bicycle race that follows the continental divide from Canada to Mexico. In this case study, we performed a comprehensive molecular and physiological profile before and after the completion of the TD. Assessments were performed 35 days before the start (Pre-TD) and ∼36 h after the finish (Post-TD). Total energy expenditure was assessed during the first 9 days by doubly labelled water (
2 H2 18 O), abdominal and leg tissue volumes via MRI, and graded exercise tests to quantify fitness and substrate preference. Vastus lateralis muscle biopsies were taken to measure mitochondrial function via respirometry, and vascular function was assessed using Doppler ultrasound. The 47-year-old male subject took 16 days 7 h 45 min to complete the route. He rode an average of 16.8 h/day. Neither maximal O2 uptake nor maximal power output changed pre- to post-TD. Measurement of total energy expenditure and dietary recall records suggested maintenance of energy balance, which was supported by the lack of change in body weight. The subject lost both appendicular and trunk fat mass and gained leg lean mass pre- to post-TD. Skeletal muscle mitochondrial and vascular endothelial function decreased pre- to post-TD. Overall, exercise performance was maintained despite reductions in muscle mitochondrial and vascular endothelial function post-TD, suggesting a metabolic reserve in our highly trained athlete., (© 2024 The Authors. Experimental Physiology published by John Wiley & Sons Ltd on behalf of The Physiological Society.)- Published
- 2024
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22. The Effects of a High-Carbohydrate versus a High-Fat Shake on Biomarkers of Metabolism and Glycemic Control When Used to Interrupt a 38-h Fast: A Randomized Crossover Study.
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Deru LS, Gipson EZ, Hales KE, Bikman BT, Davidson LE, Horne BD, LeCheminant JD, Tucker LA, and Bailey BW
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- Adult, Humans, Female, Male, Cross-Over Studies, Insulin, Glucose, Biomarkers, 3-Hydroxybutyric Acid, Gastric Inhibitory Polypeptide, Glucagon-Like Peptide 1, Transcription Factors, Tremor, Water, Glucagon, Glycemic Control
- Abstract
This study aimed to determine the impact of various fast-interrupting shakes on markers of glycemic control including glucose, β-hydroxybutyrate (BHB), insulin, glucagon, GLP-1, and GIP. Twenty-seven sedentary adults (twelve female, fifteen male) with overweight or obesity completed this study. One condition consisted of a 38-h water-only fast, and the other two conditions repeated this, but the fasts were interrupted at 24 h by either a high carbohydrate/low fat (HC/LF) shake or an isovolumetric and isocaloric low carbohydrate/high fat (LC/HF) shake. The water-only fast resulted in 135.3% more BHB compared to the HC/LF condition ( p < 0.01) and 69.6% more compared to the LC/HF condition ( p < 0.01). The LC/HF condition exhibited a 38.8% higher BHB level than the HC/LF condition ( p < 0.01). The area under the curve for glucose was 14.2% higher in the HC/LF condition than in the water condition ( p < 0.01) and 6.9% higher compared to the LC/HF condition ( p < 0.01), with the LC/HF condition yielding 7.8% more glucose than the water condition ( p < 0.01). At the 25-h mark, insulin and glucose-dependent insulinotropic polypeptide (GIP) were significantly elevated in the HC/LF condition compared to the LC/HF condition ( p < 0.01 and p = 0.02, respectively) and compared to the water condition ( p < 0.01). Furthermore, insulin, GLP-1, and GIP were increased in the LC/HF condition compared to the water condition at 25 h ( p < 0.01, p = 0.015, and p < 0.01, respectively). By the 38-h time point, no differences were observed among the conditions for any of the analyzed hormones. While a LC/HF shake does not mimic a fast completely, it does preserve some of the metabolic changes including elevated BHB and glucagon, and decreased glucose and insulin compared to a HC/LF shake, implying a potential for improved metabolic health.
- Published
- 2024
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23. Antimicrobial Stewardship at Transitions of Care.
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Dumkow LE, Geyer AC, and Davidson LE
- Abstract
Antimicrobial stewardship interventions have historically been siloed in different care settings; recently, a need for stewardship interventions at care transitions has arisen as inappropriate prescribing at care transitions may result in patient harm. There are several care areas that should be considered for optimizing antibiotic prescribing. Interventions can be difficult to implement as they often require the efforts of a multidisciplinary team and are resource intensive. Antimicrobial stewardship programs should prioritize interventions at transitions of care to improve prescribing and patient outcomes., (Copyright © 2023 Elsevier Inc. All rights reserved.)
- Published
- 2023
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24. Time Spent Jogging/Running and Biological Aging in 4458 U.S. Adults: An NHANES Investigation.
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Blackmon CM, Tucker LA, Bailey BW, and Davidson LE
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- Cross-Sectional Studies, Leukocytes physiology, Nutrition Surveys, Humans, Adult, Jogging, Running
- Abstract
Telomere length is a good index of cellular aging. Longer telomeres are predictive of longer life, and healthy lifestyles are associated with longer telomeres. This study explored the relationship between time spent jogging or running each week and leukocyte telomere length (LTL) in 4458 randomly selected U.S. adults. The association was studied using data collected by the National Health and Nutrition Examination Survey (NHANES), and a cross-sectional design. Total weekly jog/run time was calculated from survey responses. From the minute totals, three categories were formed: <10 min/week, 10-74 min/week, and ≥75 min/week. Adults in the third category met the U.S. guidelines. Data were analyzed using one-way ANOVA. Partial correlation was used to adjust for differences in potential mediating factors, including demographic and lifestyle/medical factors. In the total sample, after adjusting for all the potential covariates, mean LTL significantly differed across the three jog/run categories (F = 4.1, p = 0.0272). Specifically, adults who met the guidelines via jogging and/or running had significantly longer telomeres than adults who performed no jogging/running. Adults in the middle category did not differ from the other two categories. A minimum of 75 min of jogging/running weekly is predictive of longer telomeres when compared to adults who do not jog or run regularly.
- Published
- 2023
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25. Long-term cancer outcomes after bariatric surgery.
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Adams TD, Meeks H, Fraser A, Davidson LE, Holmen J, Newman M, Ibele AR, Playdon M, Hardikar S, Richards N, Hunt SC, and Kim J
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- Male, Humans, Female, Retrospective Studies, Obesity complications, Obesity surgery, Weight Loss, Bariatric Surgery adverse effects, Neoplasms epidemiology, Neoplasms etiology
- Abstract
Objective: Obesity is associated with increased cancer risk. Because of the substantial and sustained weight loss following bariatric surgery, postsurgical patients are ideal to study the association of weight loss and cancer., Methods: Retrospectively (1982-2019), 21,837 bariatric surgery patients (surgery, 1982-2018) were matched 1:1 by age, sex, and BMI with a nonsurgical comparison group. Procedures included gastric bypass, gastric banding, sleeve gastrectomy, and duodenal switch. Primary outcomes included cancer incidence and mortality, stratified by obesity- and non-obesity-related cancers, sex, cancer stage, and procedure., Results: Bariatric surgery patients had a 25% lower risk of developing any cancers compared with a nonsurgical comparison group (hazard ratio [HR] 0.75; 95% CI 0.69-0.81; p < 0.001). Cancer incidence was lower among female (HR 0.67; 95% CI 0.62-0.74; p < 0.001) but not male surgery patients, with the HR lower for females than for males (p < 0.001). Female surgery patients had a 41% lower risk for obesity-related cancers (i.e., breast, ovarian, uterine, and colon) compared with nonsurgical females (HR 0.59; 95% CI 0.52-0.66; p < 0.001). Cancer mortality was significantly lower after surgery in females (HR 0.53; 95% CI 0.44-0.64; p < 0.001)., Conclusions: Bariatric surgery was associated with lower all-cancer and obesity-related cancer incidence among female patients. Cancer mortality was significantly lower among females in the surgical group versus the nonsurgical group., (© 2023 The Obesity Society.)
- Published
- 2023
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26. Use of leading practices in US hospital antimicrobial stewardship programs.
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Stenehjem EA, Braun BI, Chitavi SO, Hyun DY, Schmaltz SP, Fakih MG, Neuhauser MM, Davidson LE, Meyer MJ, Tamma PD, Dodds-Ashley ES, and Baker DW
- Subjects
- Humans, Cross-Sectional Studies, Anti-Bacterial Agents therapeutic use, Hospitals, Antimicrobial Stewardship methods, Clostridioides difficile
- Abstract
Objective: To determine the proportion of hospitals that implemented 6 leading practices in their antimicrobial stewardship programs (ASPs). Design: Cross-sectional observational survey., Setting: Acute-care hospitals., Participants: ASP leaders., Methods: Advance letters and electronic questionnaires were initiated February 2020. Primary outcomes were percentage of hospitals that (1) implemented facility-specific treatment guidelines (FSTG); (2) performed interactive prospective audit and feedback (PAF) either face-to-face or by telephone; (3) optimized diagnostic testing; (4) measured antibiotic utilization; (5) measured C. difficile infection (CDI); and (6) measured adherence to FSTGs., Results: Of 948 hospitals invited, 288 (30.4%) completed the questionnaire. Among them, 82 (28.5%) had <99 beds, 162 (56.3%) had 100-399 beds, and 44 (15.2%) had ≥400+ beds. Also, 230 (79.9%) were healthcare system members. Moreover, 161 hospitals (54.8%) reported implementing FSTGs; 214 (72.4%) performed interactive PAF; 105 (34.9%) implemented procedures to optimize diagnostic testing; 235 (79.8%) measured antibiotic utilization; 258 (88.2%) measured CDI; and 110 (37.1%) measured FSTG adherence. Small hospitals performed less interactive PAF (61.0%; P = .0018). Small and nonsystem hospitals were less likely to optimize diagnostic testing: 25.2% (P = .030) and 21.0% (P = .0077), respectively. Small hospitals were less likely to measure antibiotic utilization (67.8%; P = .0010) and CDI (80.3%; P = .0038). Nonsystem hospitals were less likely to implement FSTGs (34.3%; P < .001)., Conclusions: Significant variation exists in the adoption of ASP leading practices. A minority of hospitals have taken action to optimize diagnostic testing and measure adherence to FSTGs. Additional efforts are needed to expand adoption of leading practices across all acute-care hospitals with the greatest need in smaller hospitals.
- Published
- 2023
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27. Relationship between Sitting Time and Insulin Resistance in 6931 U.S. Adults: The Mediating Role of Abdominal Adiposity.
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Parker KM, Tucker LA, Bailey BW, and Davidson LE
- Subjects
- Adult, Humans, Nutrition Surveys, Adiposity, Cross-Sectional Studies, Sitting Position, Obesity, Abdominal, Body Mass Index, Waist Circumference, Insulin Resistance
- Abstract
This cross-sectional investigation examined the relationship between sitting time and insulin resistance in 6931 U.S. adults. The mediating effects of several covariates were evaluated. Self-reported sitting time, measured in minutes per day, was the exposure variable. Insulin resistance (IR), indexed using the natural log of the homeostatic model assessment of insulin resistance (L-HOMA-IR), was the outcome variable. This study used data collected from the 2011-2018 National Health and Nutrition Examination Survey (NHANES). Results showed a strong, positive, dose-response association between sitting time and insulin resistance after adjusting for age, sex, race, and year of assessment ( F = 12.6, p < 0.0001). Across the sitting time tertiles (low, moderate, and high), the L-HOMA-IR means (±SE) each differed from each other (0.37 ± 0.008, 0.40 ± 0.012, and 0.43 ± 0.012). Further controlling for cigarette smoking and physical activity did not alter the significance of the relationship. Adding body mass index (BMI) to the demographic covariates weakened the relationship, but it remained significant. However, the association was no longer significant after adjusting for the demographic covariates and waist circumference ( F = 1.1, p = 0.3349). None of the L-HOMA-IR means (±SE) differed from each other (0.40 ± 0.007, 0.41 ± 0.009, and 0.41 ± 0.008). Overall, waist circumference was a powerful mediating variable between sitting time and insulin resistance. Apparently, time spent sitting is a powerful predictor of IR. However, much of the association between sitting time and IR is a function of differences in waist size. As a strong measure of abdominal adiposity and a significant predictor of multiple metabolic diseases, managing waist size is a health practice to consider when insulin resistance is a concern., Competing Interests: The authors declare no conflicts of interest., (Copyright © 2023 Kayla M. Parker et al.)
- Published
- 2023
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28. The Effects of Exercise on Appetite-Regulating Hormone Concentrations over a 36-h Fast in Healthy Young Adults: A Randomized Crossover Study.
- Author
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Deru LS, Chamberlain CJ, Lance GR, Gipson EZ, Bikman BT, Davidson LE, Tucker LA, Coleman JL, and Bailey BW
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- Male, Female, Humans, Young Adult, Cross-Over Studies, Hunger physiology, Glucagon-Like Peptide 1, Peptide YY, Appetite physiology, Ghrelin
- Abstract
Hunger and satiety are controlled by several physiological mechanisms, including pancreatic and gastrointestinal hormones. While the influence of exercise and fasting have been described individually, in relation to these hormones, there is a paucity of work showing the effects of the two modalities (fasting and exercise) combined. Twenty healthy adults (11 males, 9 females) completed both conditions of this study, each consisting of a 36-h water-only fast. One of the fasts began with treadmill exercise, and the differences between the conditions on various appetite hormones were measured every 12 h. The difference in the area under the curve between conditions for ghrelin was 211.8 ± 73.1 pg/mL (F = 8.40, p < 0.0105), and, for GLP-1, it was -1867.9 ± 850.4 pg/mL (F = 4.82, p < 0.0422). No significant differences were noted for areas under the curve between conditions for leptin, PP, PYY, insulin, or GIP. Initiating a fast with exercise lowers ghrelin concentrations and elevates GLP-1 concentrations. Given that ghrelin elicits feelings of hunger and GLP-1 signals feelings of satiety, adding exercise to the beginning of a fast may reduce some of the biological drive of hunger, which could make fasting more tolerable, leading to better adherence and more significant health outcomes.
- Published
- 2023
- Full Text
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29. A multimodal intervention to decrease inappropriate outpatient antibiotic prescribing for upper respiratory tract infections in a large integrated healthcare system.
- Author
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Davidson LE, Gentry EM, Priem JS, Kowalkowski M, and Spencer MD
- Subjects
- Adult, Humans, Child, Outpatients, Anti-Bacterial Agents therapeutic use, Inappropriate Prescribing prevention & control, Practice Patterns, Physicians', Internal Medicine, Respiratory Tract Infections drug therapy, Delivery of Health Care, Integrated
- Abstract
Objective: To evaluate the effectiveness of Carolinas Healthcare Outpatient Antimicrobial Stewardship Empowerment Network (CHOSEN), a multicomponent outpatient stewardship program to reduce inappropriate antibiotic prescribing for upper respiratory infections by 20% over 2 years., Design: Before-and-after interrupted time series of antibiotics prescribed between 2 periods: April 2016-October 2017 and May 2018-March 2020., Setting: The study included 162 primary-care practices within a large healthcare system in the greater Charlotte, North Carolina region., Participants: Adult and pediatric patients with encounters for upper respiratory infections for which an antibiotic is inappropriate., Methods: Patient and provider educational materials, along with a web-based provider prescribing dashboard aimed at reducing inappropriate antibiotic prescribing were developed and distributed. Monthly antibiotic prescribing rates were calculated as the number of eligible encounters with an antibiotic prescribed divided by the total number of eligible encounters. A segmented regression analysis compared monthly antibiotic prescribing rates before versus after CHOSEN implementation, while also accounting for practice type and seasonal trends in prescribing., Results: Overall, 286,580 antibiotics were prescribed during 704,248 preintervention encounters and 277,177 during 832,200 intervention encounters. Significant reductions in inappropriate prescribing rates were observed in all outpatient specialties: family medicine (relative difference before and after the intervention, -20.4%), internal medicine (-19.5%), pediatric medicine (-17.2%), and urgent care (-16.6%)., Conclusions: A robust multimodal intervention that combined a provider prescribing dashboard with a targeted education campaign demonstrated significant decreases in inappropriate outpatient antibiotic prescribing for upper respiratory tract infections in a large integrated ambulatory network.
- Published
- 2023
- Full Text
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30. Long-term all-cause and cause-specific mortality for four bariatric surgery procedures.
- Author
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Adams TD, Meeks H, Fraser A, Davidson LE, Holmen J, Newman M, Ibele AR, Richards N, Hunt SC, and Kim J
- Subjects
- Male, Female, Humans, Adolescent, Young Adult, Adult, Retrospective Studies, Cause of Death, Bariatric Surgery, Cardiovascular Diseases, Diabetes Mellitus
- Abstract
Objective: This retrospective study incorporated long-term mortality results after different bariatric surgery procedures and for multiple age at surgery groups., Methods: Participants with bariatric surgery (surgery) and without (non-surgery) were matched (1:1) for age, sex, BMI, and surgery date with a driver license application/renewal date. Mortality rates were compared by Cox regression, stratified by sex, surgery type, and age at surgery., Results: Participants included 21,837 matched surgery and non-surgery pairs. Follow-up was up to 40 years (mean [SD], 13.2 [9.5] years). All-cause mortality was 16% lower in surgery compared with non-surgery groups (hazard ratio, 0.84; 95% CI: 0.79-0.90; p < 0.001). Significantly lower mortality after bariatric surgery was observed for both females and males. Mortality after surgery versus non-surgery decreased significantly by 29%, 43%, and 72% for cardiovascular disease, cancer, and diabetes, respectively. The hazard ratio for suicide was 2.4 times higher in surgery compared with non-surgery participants (95% CI: 1.57-3.68; p < 0.001), primarily in participants with ages at surgery between 18 and 34 years., Conclusions: Reduced all-cause mortality was durable for multiple decades, for multiple bariatric surgical procedures, for females and males, and for greater than age 34 years at surgery. Rate of death from suicide was significantly higher in surgery versus non-surgery participants only in the youngest age at surgery participants., (© 2023 The Obesity Society.)
- Published
- 2023
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31. A Comprehensive Characterization of Ecological and Epidemiological Factors Driving Perennation of Podosphaera macularis Chasmothecia on Hop ( Humulus lupulus ).
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Weldon WA, Marks ME, Gevens AJ, D'Arcangelo KN, Quesada-Ocampo LM, Parry S, Gent DH, Cadle-Davidson LE, and Gadoury DM
- Subjects
- Ascomycota pathogenicity, Humulus microbiology, Plant Diseases microbiology
- Abstract
Hop powdery mildew, caused by the ascomycete fungus Podosphaera macularis , is a consistent threat to sustainable hop production. The pathogen utilizes two reproductive strategies for overwintering and perennation: (i) asexual vegetative hyphae on dormant buds that emerge the following season as infected shoots; and (ii) sexual ascocarps (chasmothecia), which are discharged during spring rain events. We demonstrate that P. macularis chasmothecia, in the absence of any asexual P. macularis growth forms, are a viable overwintering source capable of causing early season infection two to three orders of magnitude greater than that reported for perennation via asexual growth. Two epidemiological models were defined that describe (i) temperature-driven maturation of P. macularis chasmothecia; and (ii) ascosporic discharge in response to duration of leaf wetness and prevailing temperatures. P. macularis ascospores were confirmed to be infectious at temperatures ranging from 5 to 20°C. The organism's chasmothecia were also found to adhere tightly to the host tissue on which they formed, suggesting that these structures likely overwinter wherever hop tissue senesces within a hop yard. These observations suggest that existing early season disease management practices are especially crucial to controlling hop powdery mildew in the presence of P. macularis chasmothecia. Furthermore, these insights provide a baseline for the validation of weather-driven models describing maturation and release of P. macularis ascospores, models that can eventually be incorporated into hop disease management programs.
- Published
- 2021
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32. The Effects of Exercise on β-Hydroxybutyrate Concentrations over a 36-h Fast: A Randomized Crossover Study.
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Deru LS, Bikman BT, Davidson LE, Tucker LA, Fellingham G, Bartholomew CL, Yuan HL, and Bailey BW
- Subjects
- Adult, Cross-Over Studies, Female, Humans, Hunger, Male, Surveys and Questionnaires, Young Adult, 3-Hydroxybutyric Acid metabolism, Exercise physiology, Fasting physiology
- Abstract
Purpose: This study assessed β-hydroxybutyrate (BHB) concentration during a short-term fast and the degree to which an initial bout of exercise influences the rate of ketogenesis., Methods: Twenty subjects (11 male, 9 female) completed two 36-h fasts, with one protocol requiring the subject to complete a treadmill exercise session at the beginning of the fast. BHB levels were assessed via portable meter every 2 h, along with mood and hunger ratings. Venipuncture was performed every 12 h., Results: The mean (SD) areas under the curve for BHB concentration were 19.19 (2.59) mmol·L-1 (nonexercised) and 27.49 (2.59) mmol·L-1 (exercised), yielding a difference of 8.30 mmol·L-1 between conditions (95% posterior probability interval (PPI), 1.94 to 14.82 mmol·L-1; posterior probability (PP) = 0.99). The mean (SD) times to BHB concentration of 0.5 mmol·L-1 were 21.07 (2.95) h (nonexercised) and 17.5 (1.69) h (exercised), a 3.57-h difference (95% PPI, -2.11 to 10.87 h; PP = 0.89). The differences in area under the curve between conditions were 5.07 μU·mL-1 (95% PPI, -21.64 to 36.18 μU·mL-1; PP = 0.67) for insulin, 97.13 pg·mL-1 (95% PPI, 34.08 to 354.21 pg·mL-1; PP = 0.98) for glucagon, and 20.83 (95% PPI, 4.70 to 24.22; PP = 0.99) for the insulin/glucagon ratio., Conclusions: Completing aerobic exercise at the beginning of a fast accelerates the production of BHB throughout the fast without altering subjective feelings of hunger, thirst, stomach discomfort, or mood. Insulin and the insulin/glucagon ratio experience a marked reduction within the first 12 h of fasting and was not altered with exercise. Thus, exercising at the beginning of a fast may improve the metabolic outcomes of fasting., (Copyright © 2021 by the American College of Sports Medicine.)
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- 2021
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33. Milk-Fat Intake and Differences in Abdominal Adiposity and BMI: Evidence Based on 13,544 Randomly-Selected Adults.
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Wilkinson KR, Tucker LA, Davidson LE, and Bailey BW
- Subjects
- Adult, Animals, Cross-Sectional Studies, Female, Humans, Male, Middle Aged, Nutrition Surveys, Waist Circumference, Body Mass Index, Diet statistics & numerical data, Dietary Fats, Milk, Obesity, Abdominal epidemiology
- Abstract
The primary purpose of this investigation was to evaluate the relationship between milk-fat intake and obesity, particularly abdominal obesity, in 13,544 U.S. adults. A lesser objective was to measure the degree to which the association was influenced by multiple potential confounding variables. This cross-sectional study used data from the 2011-2016 National Health and Nutrition Examination Survey (NHANES). Quantity of milk-fat regularly consumed was the exposure variable. Sagittal abdominal diameter (SAD), a measure of abdominal obesity, and body mass index (BMI) were the outcome variables. Sagittal abdominal diameter is a strong predictor of visceral abdominal fat, when measured by computed tomography, and has been shown to predict cardiometabolic disorders better than BMI. After controlling for age, race, gender, physical activity, leisure computer use and gaming, alcohol habits, and cigarette use, significantly lower BMIs were associated with consistent non-fat and full-fat milk consumption (F = 4.1, p = 0.0063). A significantly lower SAD was associated only with regular consumption of non-fat milk (F = 5.0, p = 0.0019). No significant differences were detected between the other milk-fat groups or milk abstainers. In this nationally representative sample, only 19.6% of adults regularly consumed low-fat milk. In conclusion, consistent non-fat milk intake was predictive of lower levels of abdominal adiposity compared to consumption of higher levels of milk-fat.
- Published
- 2021
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34. Associations of Visceral, Subcutaneous, Epicardial, and Liver Fat with Metabolic Disorders up to 14 Years After Weight Loss Surgery.
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Hunt SC, Davidson LE, Adams TD, Ranson L, McKinlay RD, Simper SC, and Litwin SE
- Subjects
- Adult, Female, Follow-Up Studies, Gastric Bypass adverse effects, Gastric Bypass statistics & numerical data, Humans, Intra-Abdominal Fat diagnostic imaging, Intra-Abdominal Fat metabolism, Lipid Metabolism physiology, Liver diagnostic imaging, Liver metabolism, Male, Metabolic Diseases diagnosis, Metabolic Diseases epidemiology, Metabolic Diseases metabolism, Middle Aged, Obesity, Morbid diagnosis, Obesity, Morbid epidemiology, Pericardium diagnostic imaging, Pericardium metabolism, Prospective Studies, Risk Factors, Subcutaneous Fat diagnostic imaging, Subcutaneous Fat metabolism, Tomography, X-Ray Computed, Treatment Outcome, Weight Loss physiology, Adiposity physiology, Bariatric Surgery adverse effects, Bariatric Surgery statistics & numerical data, Metabolic Diseases etiology, Obesity, Morbid surgery
- Abstract
Background: Bariatric surgery leads to long-term remission and reduced incidence of diabetes, hypertension, and dyslipidemia. Short-term studies suggest reduction in specific fat depots may be more predictive of health improvement than reduced body mass index (BMI). Visceral, subcutaneous, epicardial, and liver fat, measured 11 years after bariatric surgery, were associated with long-term remission and incidence of diabetes, dyslipidemia, and hypertension. Methods: Fat depots an average of 11 (maximum 14) years after surgery were quantified by noncontrast computed tomography in subjects who did ( N = 261; 86% gastric bypass) or did not ( N = 243) have bariatric surgery. Multiple regression related fat depots to disease endpoints with and without adjustment for change in BMI and surgical status. Results: Visceral fat was 42% lower, subcutaneous fat 20% lower, epicardial fat 30% lower, and liver-to-spleen density ratio 9% higher at follow-up in the bariatric surgery group compared with the nonsurgery group (all P < 0.01). Higher visceral fat at follow-up exam was significantly associated with reduced remission and increased incidence of diabetes, hypertension, and dyslipidemia. Subcutaneous fat was not associated with disease. The liver-to-spleen ratio was associated with the remission and incidence of hypertriglyceridemia and not with other fat depots. Epicardial fat was related to incidence of elevated low-density lipoprotein cholesterol and low high-density lipoprotein cholesterol. Conclusions: Whether or not a patient shows greater long-term diabetes, dyslipidemia, or hypertension remission or incidence after bariatric surgery appears dependent on the amount of fat within specific fat depots measured at follow-up. Furthermore, associations of the three disease endpoints with different fat depots suggest varied fat depot pathology.
- Published
- 2021
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35. Skin and Soft Tissue Infections in Patients with Diabetes Mellitus.
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Polk C, Sampson MM, Roshdy D, and Davidson LE
- Subjects
- Anti-Bacterial Agents therapeutic use, Debridement methods, Diabetes Mellitus therapy, Diabetic Foot epidemiology, Diabetic Foot therapy, Drug Resistance, Bacterial, Gangrene epidemiology, Humans, Osteomyelitis epidemiology, Skin Diseases, Infectious diagnosis, Skin Diseases, Infectious therapy, Soft Tissue Infections diagnosis, Soft Tissue Infections therapy, Diabetes Mellitus epidemiology, Skin Diseases, Infectious epidemiology, Soft Tissue Infections epidemiology
- Abstract
Skin and soft tissue infections are common in diabetics. Diabetic foot infection usually results from disruption of the skin barrier, trauma, pressure, or ischemic wounds. These wounds may become secondarily infected or lead to development of adjacent soft tissue or deeper bone infection. Clinical assessment and diagnosis of these conditions using a multidisciplinary management approach, including careful attention to antibiotic selection, lead to the best outcomes in patient care., Competing Interests: Disclosure C. Polk has received research funding from Merck, United States., (Copyright © 2020 Elsevier Inc. All rights reserved.)
- Published
- 2021
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36. Transcriptome-Derived Amplicon Sequencing Markers Elucidate the U.S. Podosphaera macularis Population Structure Across Feral and Commercial Plantings of Humulus lupulus .
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Weldon WA, Knaus BJ, Grünwald NJ, Havill JS, Block MH, Gent DH, Cadle-Davidson LE, and Gadoury DM
- Subjects
- New England, Northwestern United States, Plant Diseases, Transcriptome, United Kingdom, Ascomycota genetics, Humulus
- Abstract
Obligately biotrophic plant pathogens pose challenges in population genetic studies due to their genomic complexities and elaborate culturing requirements with limited biomass. Hop powdery mildew ( Podosphaera macularis ) is an obligately biotrophic ascomycete that threatens sustainable hop production. P. macularis populations of the Pacific Northwest (PNW) United States differ from those of the Midwest and Northeastern United States, lacking one of two mating types needed for sexual recombination and harboring two strains that are differentially aggressive on the cultivar Cascade and able to overcome the Humulus lupulus R -gene R6 ( V6 ), respectively. To develop a high-throughput marker platform for tracking the flow of genotypes across the United States and internationally, we used an existing transcriptome of diverse P. macularis isolates to design a multiplex of 54 amplicon sequencing markers, validated across a panel of 391 U.S. samples and 123 international samples. The results suggest that P. macularis from U.S. commercial hop yards form one population closely related to P. macularis of the United Kingdom, while P. macularis from U.S. feral hop locations grouped with P. macularis of Eastern Europe. Included in this multiplex was a marker that successfully tracked V6 -virulence in 65 of 66 samples with a confirmed V6 -phenotype. A new qPCR assay for high-throughput genotyping of P. macularis mating type generated the highest resolution distribution map of P. macularis mating type to date. Together, these genotyping strategies enable the high-throughput and inexpensive tracking of pathogen spread among geographical regions from single-colony samples and provide a roadmap to develop markers for other obligate biotrophs.
- Published
- 2021
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37. Mediators of suicidality 12 years after bariatric surgery relative to a nonsurgery comparison group.
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Mabey JG, Kolotkin RL, Crosby RD, Crowell SE, Hunt SC, and Davidson LE
- Subjects
- Humans, Quality of Life, Surveys and Questionnaires, Bariatric Surgery, Obesity, Morbid surgery, Suicide
- Abstract
Background: Individuals undergoing bariatric surgery report higher levels of suicidality than the general population, but it is unknown what mediates this phenomenon or how this compares with individuals with severe obesity not receiving surgery., Objectives: We evaluated suicidality in 131 individuals 12 years post surgery compared with 205 individuals with severe obesity who did not undergo surgery. Changes in health-related quality of life (HRQOL) and metabolic health were assessed as mediators of suicidality., Setting: University., Methods: Suicidality was assessed with the Suicide Behaviors Questionnaire-Revised at 12 years. Metabolic health and HRQOL (Short Form-36 [SF-36] Mental Component Summary score, Physical Component Summary score, and Impact of Weight on Quality of Life-Lite) were assessed at baseline and 2 and 6 years. The effects of bariatric surgery on suicidality at 12 years were assessed through univariate and multivariate sequential moderated mediation models, with changes in metabolic health and HRQOL from 0-2 years and 2-6 years as mediators., Results: Suicidality was higher in the surgery group versus the nonsurgery group (estimate [est.] = .708, SE = .292, P < .05). Only the indirect pathways at 2 years after surgery for SF-36 Mental Component Summary in the univariate models (est. = -.172, SE = .080, P < .05) and for SF-36 Physical Component Summary in the multivariate model (est. = .593, SE = .281, P < .05) were significant., Conclusion: Individuals undergoing bariatric surgery reported higher levels of suicidality at 12 years, which was mediated by less improvement in the mental and physical components of HRQOL in the first 2 years after surgery, suggesting the need for additional clinical monitoring., (Copyright © 2020 American Society for Bariatric Surgery. Published by Elsevier Inc. All rights reserved.)
- Published
- 2021
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38. Gut microbiota differs a decade after bariatric surgery relative to a nonsurgical comparison group.
- Author
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Mabey JG, Chaston JM, Castro DG, Adams TD, Hunt SC, and Davidson LE
- Subjects
- Humans, Obesity, Bariatric Surgery, Diabetes Mellitus, Type 2, Gastrointestinal Microbiome, Obesity, Morbid surgery
- Abstract
Background: Few studies have assessed differences in the gut microbiota composition after bariatric surgery in the long term or whether differences are correlated with remission of type 2 diabetes., Objectives: This observational study assessed differences in the gut microbiota between individuals at up to 13 years after surgery and a comparison group of individuals with severe obesity. The relationship between type 2 diabetes remission and the gut microbiota was also assessed., Setting: University., Methods: Stool samples were collected from individuals completing bariatric surgery (surgery group; n = 16) and individuals with severe obesity that did not receive surgery (nonsurgery group; n = 19) as part of the 12-year follow-up in the Utah Obesity Study. Metabolic health data were collected at baseline and the follow-up examination. The gut microbiota was quantified by sequencing the V4 region of the 16 S rRNA gene. Significant differences in microbiota composition with surgery and other covariates were determined by Unifrac distance analysis and permutational multivariate analysis of variance. Significant differences in the relative abundance of individual bacterial taxa were assessed using analysis of composition of microbiomes software., Results: The surgery group had higher relative abundances of Verrucomicrobiaceae (5.7 ± 1.3% versus 1.1 ± .3%) and Streptococcaceae (6.3 ± 1.0% versus 3.2 ± .8%), but lower relative abundances of Bacteroidaceae (8.8 ± 1.8% versus 18.6 ± 2.3%) 10.6 years after surgery. In a small subset of 8 individuals, a higher relative abundance of Akkermansia muciniphila was correlated with type 2 diabetes remission., Conclusions: Differences in the gut microbiota are evident a decade after bariatric surgery compared with individuals with severe obesity that did not undergo surgery. The observed long-term differences are consistent with previous findings., (Copyright © 2020 American Society for Bariatric Surgery. Published by Elsevier Inc. All rights reserved.)
- Published
- 2020
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39. Ketones Elicit Distinct Alterations in Adipose Mitochondrial Bioenergetics.
- Author
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Walton CM, Jacobsen SM, Dallon BW, Saito ER, Bennett SLH, Davidson LE, Thomson DM, Hyldahl RD, and Bikman BT
- Subjects
- 3-Hydroxybutyric Acid pharmacology, 3T3-L1 Cells, Adenosine Triphosphate metabolism, Adipocytes drug effects, Adipocytes metabolism, Adult, Animals, Cells, Cultured, Energy Metabolism drug effects, Female, Gene Expression Profiling, Gene Expression Regulation drug effects, Gene Regulatory Networks drug effects, Humans, Male, Mice, Mitochondria drug effects, Rats, Subcutaneous Fat drug effects, 3-Hydroxybutyric Acid administration & dosage, Adipocytes cytology, Mitochondria metabolism, Subcutaneous Fat metabolism
- Abstract
Objective: The rampant growth of obesity worldwide has stimulated explosive research into human metabolism. Energy expenditure has been shown to be altered by diets differing in macronutrient composition, with low-carbohydrate, ketogenic diets eliciting a significant increase over other interventions. The central aim of this study was to explore the effects of the ketone β-hydroxybutyrate (βHB) on mitochondrial bioenergetics in adipose tissue., Methods: We employed three distinct systems-namely, cell, rodent, and human models. Following exposure to elevated βHB, we obtained adipose tissue to quantify mitochondrial function., Results: In every model, βHB robustly increased mitochondrial respiration, including an increase of roughly 91% in cultured adipocytes, 113% in rodent subcutaneous adipose tissue (SAT), and 128% in human SAT. However, this occurred without a commensurate increase in adipose ATP production. Furthermore, in cultured adipocytes and rodent adipose, we quantified and observed an increase in the gene expression involved in mitochondrial biogenesis and uncoupling status following βHB exposure., Conclusions: In conclusion, βHB increases mitochondrial respiration, but not ATP production, in mammalian adipocytes, indicating altered mitochondrial coupling. These findings may partly explain the increased metabolic rate evident in states of elevated ketones, and may facilitate the development of novel anti-obesity interventions.
- Published
- 2020
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40. A case study exploring associations between popular media attention of scientific research and scientific citations.
- Author
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Anderson PS, Odom AR, Gray HM, Jones JB, Christensen WF, Hollingshead T, Hadfield JG, Evans-Pickett A, Frost M, Wilson C, Davidson LE, and Seeley MK
- Subjects
- Bibliometrics, Humans, Journal Impact Factor, Peer Review trends, Research trends, Social Media trends, Communications Media trends, Information Dissemination methods, Publications trends
- Abstract
The association between mention of scientific research in popular media (e.g., the mainstream media or social media platforms) and scientific impact (e.g., citations) has yet to be fully explored. The purpose of this study was to clarify this relationship, while accounting for some other factors that likely influence scientific impact (e.g., the reputations of the scientists conducting the research and academic journal in which the research was published). To accomplish this purpose, approximately 800 peer-reviewed articles describing original research were evaluated for scientific impact, popular media attention, and reputations of the scientists/authors and publication venue. A structural equation model was produced describing the relationship between non-scientific impact (popular media) and scientific impact (citations), while accounting for author/scientist and journal reputation. The resulting model revealed a strong association between the amount of popular media attention given to a scientific research project and corresponding publication and the number of times that publication is cited in peer-reviewed scientific literature. These results indicate that (1) peer-reviewed scientific publications receiving more attention in non-scientific media are more likely to be cited than scientific publications receiving less popular media attention, and (2) the non-scientific media is associated with the scientific agenda. These results may inform scientists who increasingly use popular media to inform the general public and scientists concerning their scientific work. These results might also inform administrators of higher education and research funding mechanisms, who base decisions partly on scientific impact., Competing Interests: The authors declare that no competing interests exist.
- Published
- 2020
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41. Longitudinal Changes in Cardiac Structure and Function in Severe Obesity: 11-Year Follow-Up in the Utah Obesity Study.
- Author
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Litwin SE, Adams TD, Davidson LE, McKinlay R, Simper SC, Ranson L, and Hunt SC
- Subjects
- Adult, Body Mass Index, Female, Heart Failure epidemiology, Heart Failure physiopathology, Humans, Hypertrophy, Left Ventricular diagnostic imaging, Hypertrophy, Left Ventricular epidemiology, Longitudinal Studies, Male, Middle Aged, Obesity diagnosis, Obesity epidemiology, Risk Assessment, Risk Factors, Severity of Illness Index, Time Factors, Utah epidemiology, Ventricular Dysfunction, Left epidemiology, Ventricular Dysfunction, Left physiopathology, Hypertrophy, Left Ventricular physiopathology, Obesity physiopathology, Ventricular Function, Left, Ventricular Remodeling
- Abstract
Background Progressive cardiac remodeling and worsening myocardial function over time have been proposed as potential mediators of heart failure in obesity. Methods and Results We serially assessed cardiac structure and function in 254 subjects participating in a longitudinal study of obesity. Demographic, clinical, laboratory, and echocardiographic features were determined at baseline and 2-, 6-, and 11-year follow-up. We measured body mass index (BMI) exposure as the area under the curve of the BMI at each of the 4 visits. At enrollment, mean age of the subjects was 47 years, 79% were women, mean BMI was 44 kg/m
2 , 26% had diabetes mellitus, 48% had hypertension, and 53% had hyperlipidemia. Between baseline and 11 years, BMI increased by 1.1 and 0.3 kg/m2 in men and women, respectively. There were modest increases in left ventricular (LV) end-diastolic volume, LV mass, and left atrial volume, and significant decreases in early/late mitral diastolic flow velocity ratio and E wave deceleration time. However, there were no significant changes in LV ejection fraction or ratio of early mitral diastolic flow velocity/early mitral annular velocity, whereas right ventricular fractional area change increased. Significant predictors of the change in LV mass were male sex, baseline BMI, BMI area under the curve, and change in LV stroke volume, but not smoking, hypertension, or diabetes mellitus. Conclusions In long-standing, persistent severe obesity, there was evidence of cardiac remodeling over a period of 11 years, but no clear worsening of systolic or diastolic function. Measures of remodeling were most strongly related to BMI. The observed changes might predispose to heart failure with preserved ejection fraction, but are not classic for an evolving dilated cardiomyopathy.- Published
- 2020
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42. Strength Training and Insulin Resistance: The Mediating Role of Body Composition.
- Author
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Niemann MJ, Tucker LA, Bailey BW, and Davidson LE
- Subjects
- Adult, Aged, Aged, 80 and over, Cross-Sectional Studies, Female, Humans, Male, Middle Aged, Nutrition Surveys, Resistance Training, Waist Circumference physiology, Young Adult, Blood Glucose, Body Composition physiology, Body Mass Index, Insulin Resistance physiology
- Abstract
The main objective of the present study was to assess the association between participation in strength training and insulin resistance. Another goal was to assess the influence of several potential confounding variables on the strength training and insulin resistance relationship. Lastly, the influence of waist circumference, fat-free mass (kg), body fat percentage, and the fat-free mass index on the association between strength training and insulin resistance was assessed. This cross-sectional study included 6,561 randomly selected men and women in the U.S. Data were collected using the precise protocol established by NHANES. HOMA-IR was used as the outcome variable to index insulin resistance. Both time spent strength training and frequency of strength training bouts were used as exposure variables. There was not a statistically significant relationship between strength training and insulin resistance in women. However, before and after controlling for 11 potential confounding variables, men who reported no strength training had significantly higher levels of HOMA-IR compared to men who reported moderate or high levels of strength training ( F = 9.87, P < 0.0001). Odds ratios were also assessed. Men reporting no strength training had 2.42 times the odds of having insulin resistance compared to men reporting moderate levels of strength training (95% CI: 1.19-4.93). Similarly, men reporting no strength training had 2.50 times the odds of having insulin resistance compared to men reporting high levels of strength training (95% CI: 1.25-5.00). In conclusion, there was a strong relationship between strength training and insulin resistance in U.S. men, but not in U.S. women. Differences in waist circumference, fat-free mass (kg), body fat percentage, and the fat-free mass index, as well as demographic and lifestyle measures, do not appear to mediate the relationship. The present study was not a clinical trial., Competing Interests: The authors declare that there are no conflicts of interest regarding publication of this paper., (Copyright © 2020 McKayla J. Niemann et al.)
- Published
- 2020
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43. Does Bariatric Surgery Increase or Reduce Colorectal Cancer Risk-Is the Jury Still Out?
- Author
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Davidson LE and Adams TD
- Subjects
- Humans, Obesity complications, Obesity epidemiology, Bariatric Surgery, Colorectal Neoplasms epidemiology, Colorectal Neoplasms prevention & control, Colorectal Neoplasms surgery
- Published
- 2020
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44. Bugs and Drugs: Collaboration Between Infection Prevention and Antibiotic Stewardship.
- Author
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Gentry EM, Kester S, Fischer K, Davidson LE, and Passaretti CL
- Subjects
- Anti-Bacterial Agents therapeutic use, Antimicrobial Stewardship organization & administration, Bacteriuria prevention & control, Clostridium Infections prevention & control, Cross Infection microbiology, Humans, Public Health methods, Public Health standards, Surgical Wound Infection prevention & control, Anti-Bacterial Agents administration & dosage, Antimicrobial Stewardship methods, Cross Infection prevention & control, Drug Resistance, Multiple, Bacterial, Intersectoral Collaboration
- Abstract
Overall goals of antibiotic stewardship and infection prevention programs are to improve patient safety as it pertains to risk of infection or multidrug-resistant organism (MDRO) acquisition. Although the focus of day-to-day activities may differ, the themes of surveillance, education, clinician engagement, and multidisciplinary interactions are prevalent in both programs. Synergistic work between programs has yielded benefits in prevention of MDROs, surgical site infections, Clostridioides difficile infection, and reducing inappropriate testing and treatment for asymptomatic bacteriuria. Collaboration between programs can help maximize resources and minimize redundant work to keep issues related to bugs and drugs at bay., Competing Interests: Financial Disclosures All authors have nothing to disclose., (Published by Elsevier Inc.)
- Published
- 2020
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45. Physical Activity Patterns Among Individuals Before and Soon After Bariatric Surgery.
- Author
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Ouellette KA, Mabey JG, Eisenman PA, Shaw JM, Brusseau TA, Hatfield DL, Ford CN, and Davidson LE
- Subjects
- Accelerometry, Adult, Aged, Female, Humans, Life Style, Male, Middle Aged, Obesity, Morbid rehabilitation, Postoperative Period, Sedentary Behavior, Self Report, Utah epidemiology, Walking, Weight Loss physiology, Young Adult, Bariatric Surgery rehabilitation, Bariatric Surgery statistics & numerical data, Exercise physiology, Obesity, Morbid epidemiology, Obesity, Morbid surgery
- Abstract
Purpose: Post-operative changes in moderate-to-vigorous physical activity (MVPA) may contribute to improved weight loss and long-term weight maintenance of individuals after bariatric surgery. Patients experience minimal changes in MVPA > 6 months after surgery, but no studies have investigated early changes in physical activity after surgery. This study aims to assess MVPA changes during the rapid weight loss phase through self-reporting and objective measures., Methods: Physical activity patterns were assessed as minutes per day spent doing MVPA. A walking cadence of ≥ 100 steps per minute defined MVPA. Individuals completing gastric bypass (N = 7) and sleeve gastrectomy (N = 17) procedures (21 females, 3 males, age 42.2 ± 12.6 years, body mass 121.8 ± 24.8 kg, BMI 44.0 ± 6.5) completed office visits at 12 ± 6 days pre- and 35 ± 10 days post-operative. Each wore an ActiGraph GT3X tri-axial accelerometer at the hip for 7 days before and again for 7 days 30.6 ± 10 days after surgery. Assessments also included a subjective question about their anticipated and perceived post-operative MVPA (scale of - 3 to 3 with 3 being much more physically active and - 3 being much less)., Results: Participants did not change their minutes per day of MVPA significantly (pre-operative 1.5 ± 2.1; post-operative 2.6 ± 5.6, NS). Participants predicted their post-operative physical activity level would increase (2.8 ± 0.4). The self-reported activity level on the same scale after surgery was significantly less than predicted (1.9 ± 1.0, p < 0.05) but still suggested that participants thought they were more physically active., Conclusion: Consistent with reports > 6 months after surgery, MVPA did not increase in the early post-operative period, despite patient expectations. The early post-operative period may be a time for behavioral intervention.
- Published
- 2020
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46. Establishing an Antimicrobial Stewardship Collaborative Across a Large, Diverse Health Care System.
- Author
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Logan AY, Williamson JE, Reinke EK, Jarrett SW, Boger MS, and Davidson LE
- Subjects
- Anti-Bacterial Agents therapeutic use, Drug Utilization, Humans, Inservice Training, Leadership, Anti-Bacterial Agents administration & dosage, Antimicrobial Stewardship organization & administration, Delivery of Health Care organization & administration, Pharmacists organization & administration
- Abstract
Alarming trends in antibiotic resistance sparked a National Action Plan endorsing antimicrobial stewardship programs (ASPs) in health care facilities. Atrium Health consists of 28 acute care facilities with varying levels of ASP maturity. The organization sought to establish an ASP collaborative across a diverse network by uniting local resources with a central advisory team., Methods: In fall 2015 each facility chose a pharmacist, a physician, and an administrative ASP champion. Broad-spectrum antibiotic use was tracked monthly using days of therapy (DOT) per 1,000 patient-days as a standard metric. A gap analysis survey of Centers for Disease Control and Prevention (CDC) core elements for ASPs was conducted to stratify facilities into one of three tiers, with Tier 1 having the most comprehensive ASP. Baseline antibiotic usage data were collected, and DOT reduction goals were set for each facility. Site visits were conducted in winter 2016, and a post-visit summary outlining major goals was provided. Pharmacists held monthly facility meetings to assess progress and a bimonthly virtual meeting for sharing best practices networkwide. In addition, curriculum for an ASP symposium was developed based on identified educational needs., Results: Almost all hospitals (25/28) fully implemented the CDC core elements for ASPs within the first year of establishing the systemwide collaborative. Most facilities (78.6%) achieved their DOT reduction goal ranging from 1%-2.5% to 5%-10%., Conclusion: Despite many challenges, building a unified ASP collaborative across a diverse system enabled many hospitals to adopt best practices and improve antimicrobial use., (Copyright © 2019 The Joint Commission. Published by Elsevier Inc. All rights reserved.)
- Published
- 2019
- Full Text
- View/download PDF
47. Fitness versus adiposity in cardiovascular disease risk.
- Author
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Davidson LE, Hunt SC, and Adams TD
- Subjects
- Humans, Risk Factors, Body Composition, Cardiovascular Diseases physiopathology, Obesity physiopathology, Physical Fitness
- Abstract
Obesity and low cardiorespiratory fitness are both established predictors of cardiovascular disease morbidity and mortality. Whether the protective effects of fitness outweigh the deleterious effects of obesity, however, remains a topic of debate. To extend knowledge of the relative influence of fitness and fatness on cardiovascular disease outcomes, however, attention must be paid to measurement quality. Eliminating inherent bias of self-report and including the highest quality assessments of cardiorespiratory fitness and fatness simultaneously are imperative for head-to-head comparisons. Studies must move beyond body mass index and total body fat percentage to differentiate the heterogenous effects of various adipose tissue depots on cardiovascular risk. Imaging techniques that measure visceral adiposity and other risk-laden ectopic adipose depots while also quantifying cardioprotective adipose depots such as lower body subcutaneous fat and even non-adipose tissues such as skeletal muscle may further illuminate the influence of body composition on cardiovascular health. This review underscores key studies within a large body of literature that provide the foundation for the fit-vs.-fat debate in the context of cardiovascular disease risk, and identifies important considerations for future research.
- Published
- 2019
- Full Text
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48. 12-year trajectory of health-related quality of life in gastric bypass patients versus comparison groups.
- Author
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Kolotkin RL, Kim J, Davidson LE, Crosby RD, Hunt SC, and Adams TD
- Subjects
- Adult, Body Weight, Female, Health Surveys, Humans, Male, Middle Aged, Prospective Studies, Gastric Bypass statistics & numerical data, Obesity, Morbid epidemiology, Obesity, Morbid psychology, Obesity, Morbid therapy, Quality of Life psychology
- Abstract
Background: Few prospective studies compare long-term health-related quality of life (HRQOL) outcomes between bariatric surgery patients and individuals with severe obesity who do not undergo bariatric surgery., Objectives: This 12-year, prospective study evaluated the trajectory and durability of HRQOL changes in gastric bypass patients (surgery group; n = 418) and compared these changes to 2 nonsurgical groups. The nonsurgery group 1 (n = 417) sought but did not have surgery; nonsurgery group 2 (n = 321) had severe obesity but did not seek surgery., Setting: Bariatric surgery center., Methods: Weight-related (impact of weight on quality of life-lite [IWQOL-Lite]) and general (short-form health survey-36 [SF-36]) HRQOL questionnaires were administered at baseline and 2, 6, and 12 years postsurgery., Results: At 12 years, the surgery group showed greatly improved weight-related HRQOL (IWQOL-Lite) and physical HRQOL (physical component summary of short-form health survey-36) from baseline, and differences between the surgery group and both nonsurgery groups were significant for IWQOL-Lite and physical component summary. IWQOL-Lite and physical component summary scores peaked at 2 years, followed by declines from 2 to 6 and 6 to 12 years. Small improvements in mental/psychosocial aspects of HRQOL (mental component summary of short-form health survey-36) seen in the surgery group at 2 years were not maintained at either 6 or 12 years., Conclusions: Gastric bypass patients demonstrated significantly higher weight-related and physical HRQOL at 12 years compared with their very low baseline scores, with the trajectory peaking at 2 years. Despite declining HRQOL between 2 and 12 years, the magnitude of improvement supports the clinical relevance of bariatric surgery for enhancing patients' quality of life., (Copyright © 2018 American Society for Bariatric Surgery. Published by Elsevier Inc. All rights reserved.)
- Published
- 2018
- Full Text
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49. Brain reactivity to visual food stimuli after moderate-intensity exercise in children.
- Author
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Masterson TD, Kirwan CB, Davidson LE, Larson MJ, Keller KL, Fearnbach SN, Evans A, and LeCheminant JD
- Subjects
- Brain Mapping, Child, Cross-Over Studies, Feeding Behavior physiology, Female, Humans, Magnetic Resonance Imaging, Male, Brain diagnostic imaging, Brain physiology, Exercise physiology, Food, Pattern Recognition, Visual physiology
- Abstract
Exercise may play a role in moderating eating behaviors. The purpose of this study was to examine the effect of an acute bout of exercise on neural responses to visual food stimuli in children ages 8-11 years. We hypothesized that acute exercise would result in reduced activity in reward areas of the brain. Using a randomized cross-over design, 26 healthy weight children completed two separate laboratory conditions (exercise; sedentary). During the exercise condition, each participant completed a 30-min bout of exercise at moderate-intensity (~ 67% HR maximum) on a motor-driven treadmill. During the sedentary session, participants sat continuously for 30 min. Neural responses to high- and low-calorie pictures of food were determined immediately following each condition using functional magnetic resonance imaging. There was a significant exercise condition*stimulus-type (high- vs. low-calorie pictures) interaction in the left hippocampus and right medial temporal lobe (p < 0.05). Main effects of exercise condition were observed in the left posterior central gyrus (reduced activation after exercise) (p < 0.05) and the right anterior insula (greater activation after exercise) (p < 0.05). The left hippocampus, right medial temporal lobe, left posterior central gyrus, and right anterior insula appear to be activated by visual food stimuli differently following an acute bout of exercise compared to a non-exercise sedentary session in 8-11 year-old children. Specifically, an acute bout of exercise results in greater activation to high-calorie and reduced activation to low-calorie pictures of food in both the left hippocampus and right medial temporal lobe. This study shows that response to external food cues can be altered by exercise and understanding this mechanism will inform the development of future interventions aimed at altering energy intake in children.
- Published
- 2018
- Full Text
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50. Fat-Free Mass and Skeletal Muscle Mass Five Years After Bariatric Surgery.
- Author
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Davidson LE, Yu W, Goodpaster BH, DeLany JP, Widen E, Lemos T, Strain GW, Pomp A, Courcoulas AP, Lin S, Janumala I, Thornton JC, and Gallagher D
- Subjects
- Adiposity physiology, Adult, Bariatric Surgery methods, Biliopancreatic Diversion rehabilitation, Cohort Studies, Female, Gastrectomy methods, Gastrectomy rehabilitation, Gastric Bypass methods, Gastric Bypass rehabilitation, Humans, Longitudinal Studies, Magnetic Resonance Imaging, Male, Middle Aged, Obesity, Morbid rehabilitation, Weight Loss physiology, Whole Body Imaging, Bariatric Surgery rehabilitation, Body Composition physiology, Muscle, Skeletal pathology, Obesity, Morbid metabolism, Obesity, Morbid surgery
- Abstract
Objective: This study investigated changes in fat-free mass (FFM) and skeletal muscle 5 years after surgery in participants from the Longitudinal Assessment of Bariatric Surgery-2 trial., Methods: A three-compartment model assessed FFM, and whole-body magnetic resonance imaging (MRI) quantified skeletal muscle mass prior to surgery (T0) and 1 year (T1), 2 years (T2), and 5 years (T5) postoperatively in 93 patients (85% female; 68% Caucasian; age 44.2 ± 11.6 years) who underwent gastric bypass (RYGB), sleeve gastrectomy, or adjustable gastric band. Repeated-measures mixed models were used to analyze the data., Results: Significant weight loss occurred across all surgical groups in females from T0 to T1. FFM loss from T0 to T1 was greater after RYGB (mean ± SE: -6.9 ± 0.6 kg) than adjustable gastric band (-3.5 ± 1.4 kg; P < 0.05). Females with RYGB continued to lose FFM (-3.3 ± 0.7 kg; P < 0.001) from T1 to T5. A subset of males and females with RYGB and MRI-measured skeletal muscle showed similar initial FFM loss while maintaining FFM and skeletal muscle from T1 to T5., Conclusions: Between 1 and 5 years following common bariatric procedures, FFM and skeletal muscle are maintained or decrease minimally. The changes observed in FFM and muscle during the follow-up phase may be consistent with aging., (© 2018 The Obesity Society.)
- Published
- 2018
- Full Text
- View/download PDF
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