22 results on '"Casey G. Turner"'
Search Results
2. Endothelin A receptor inhibition increases nitric oxide-dependent vasodilation independent of superoxide in non-Hispanic Black young adults
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Casey G. Turner, Matthew J. Hayat, Caroline Grosch, Arshed A. Quyyumi, Jeffrey S. Otis, and Brett J. Wong
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Physiology ,Physiology (medical) - Abstract
Endothelin-1 A receptors (ETARs) have been shown to reduce endothelial function independently and through increased production of superoxide. We show that independent ETAR inhibition increases microvascular endothelial function in non-Hispanic Black young adults. However, administration of a superoxide dismutase mimetic alone and in combination with ETAR inhibition had no effect on microvascular endothelial function suggesting that, in the cutaneous microvasculature, the negative effects of ETAR in non-Hispanic Black young adults are independent of superoxide production.
- Published
- 2023
3. Microvascular endothelial function following cessation of long‐term oral contraceptive pill use: A case report
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Casey G, Turner, Anna E, Stanhewicz, Karen E, Nielsen, and Brett J, Wong
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Nutrition and Dietetics ,Physiology ,Physiology (medical) ,General Medicine - Abstract
What is the main observation in this case? The main observation of this case report is substantial improvement in cutaneous microvascular endothelial function after cessation of long-term use of a fourth-generation oral contraceptive pill. This improvement appears independent of relative changes in the contribution of nitric oxide. What insights does it reveal? Our findings suggest that cessation of long-term, fourth-generation oral contraceptive pill use improves endothelial function within 20 months of cessation.The purpose of this case report was to evaluate in vivo endothelial function and nitric oxide (NO)-dependent vasodilatation before and after the cessation of long-term (11-12 years) fourth-generation oral contraceptive pill (OCP) use in one young, healthy and premenopausal woman. This retrospective analysis includes data from six experimental visits: three visits during months 133-144 of fourth-generation OCP use and three visits 19-22 months after OCP cessation. Endothelium-dependent and NO-dependent vasodilatation were assessed in the cutaneous microvasculature using laser-Doppler flowmetry, a rapid local heating protocol (39°C, 0.1°C/s) and pharmacological perfusion through intradermal microdialysis fibres. The participant had consistent medical history and lifestyle behaviours throughout both hormonal exposures. Data are presented as the mean (SD). Endothelium-dependent vasodilatation was 42 (10)% of site-specific maximal cutaneous vascular conductance (CVC
- Published
- 2022
4. Reply to Letter to the Editor in response to: Microvascular endothelial function following cessation of long‐term oral contraceptive pill use
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Casey G. Turner, Anna E. Stanhewicz, Karen E. Nielsen, and Brett J. Wong
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Nutrition and Dietetics ,Physiology ,Physiology (medical) ,General Medicine - Published
- 2023
5. Metabolic Alterations Differentiating Cardiovascular Maladaptation from Athletic Training in American-Style Football Athletes
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Jason V, Tso, Chang, Liu, Casey G, Turner, Karan, Uppal, Ganesh, Prabakaran, Kiran, Ejaz, Aaron L, Baggish, Dean P, Jones, Arshed A, Quyyumi, and Jonathan H, Kim
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Athletes ,Eicosanoic Acids ,Hypoxanthines ,Lysine ,Stearates ,Football ,Humans ,Physical Therapy, Sports Therapy and Rehabilitation ,Orthopedics and Sports Medicine ,Pulse Wave Analysis ,Arginine ,Ventricular Function, Left - Abstract
Metabolomics identifies molecular products produced in response to numerous stimuli, including both adaptive (includes exercise training) and disease processes. We analyzed a longitudinal cohort of American-style football (ASF) athletes, who reliably acquire maladaptive cardiovascular (CV) phenotypes during competitive training, with high-resolution metabolomics to determine whether metabolomics can discriminate exercise-induced CV adaptations from early CV pathology.Matched discovery ( n = 42) and validation ( n = 40) multicenter cohorts of collegiate freshman ASF athletes were studied with longitudinal echocardiography, applanation tonometry, and high-resolution metabolomics. Liquid chromatography-mass spectrometry identified metabolites that changed ( P0.05, false discovery rate0.2) over the season. Metabolites demonstrating similar changes in both cohorts were further analyzed in linear and mixed-effects models to identify those associated with left ventricular mass, tissue-Doppler myocardial E ' velocity (diastolic function), and arterial function (pulse wave velocity).In both cohorts, 20 common metabolites changed similarly across the season. Metabolites reflective of favorable CV health included an increase in arginine and decreases in hypoxanthine and saturated fatty acids (heptadecanoate, arachidic acid, stearate, and hydroxydecanoate). In contrast, metabolic perturbations of increased lysine and pipecolate, reflective of adverse CV health, were also observed. Adjusting for player position, race, height, and changes in systolic blood pressure, weight, and pulse wave velocity, increased lysine ( β = 0.018, P = 0.02) and pipecolate ( β = 0.018, P = 0.02) were associated with increased left ventricular mass index. In addition, increased lysine ( β = -0.049, P = 0.01) and pipecolate ( β = -0.052, P = 0.008) were also associated with lower E ' (reduced diastolic function).ASF athletes seem to develop metabolomic changes reflective of both favorable CV health and early CV maladaptive phenotypes. Whether metabolomics can discriminate early pathologic CV transformations among athletes is a warranted future research direction.
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- 2022
6. Contribution of sensory nerves to cutaneous reactive hyperaemia in non‐Hispanic Black and White young adults
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Casey G. Turner, Demetria C. Walker, and Brett J. Wong
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Nutrition and Dietetics ,Physiology ,Physiology (medical) ,General Medicine - Published
- 2023
7. Association between race and maladaptive concentric left ventricular hypertrophy in American-style football athletes
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Aaron L. Baggish, Casey G Turner, Craig Clark, Herman A. Taylor, Chang Liu, Jonathan H. Kim, Angelo Galante, Carla R. Gilson, Arshed A. Quyyumi, and Jason Tso
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Population ,Football ,Blood Pressure ,Physical Therapy, Sports Therapy and Rehabilitation ,Family income ,Concentric ,Left ventricular hypertrophy ,Article ,Humans ,Medicine ,Orthopedics and Sports Medicine ,cardiovascular diseases ,Risk factor ,education ,education.field_of_study ,biology ,business.industry ,Athletes ,General Medicine ,biology.organism_classification ,medicine.disease ,United States ,Blood pressure ,Echocardiography ,Hypertrophy, Left Ventricular ,business ,Demography - Abstract
ObjectivesAmerican-style football (ASF) athletes are at risk for the development of concentric left ventricular hypertrophy (C-LVH), an established cardiovascular risk factor in the general population. We sought to address whether black race is associated with acquired C-LVH in collegiate ASF athletes.MethodsCollegiate ASF athletes from two National Collegiate Athletic Association Division-I programmes were recruited as freshmen between 2014 and 2019 and analysed over 3 years. Demographics (neighbourhood family income) and repeated clinical characteristics and echocardiography were recorded longitudinally at multiple timepoints. A mixed-modelling approach was performed to evaluate acquired C-LVH in black versus white athletes controlling for playing position (linemen (LM) and non-linemen (NLM)), family income, body weight and blood pressure.ResultsAt baseline, black athletes (N=124) were more often NLM (72% vs 54%, p=0.005) and had lower median neighbourhood family income ($54 119 vs $63 146, p=0.006) compared with white athletes (N=125). While both black and white LM demonstrated similar increases in C-LVH over time, among NLM acquired C-LVH was more common in black versus white athletes (postseason year-1: N=14/89 (16%) vs N=2/68 (3%); postseason year-2: N=9/50 (18%) vs N=2/32 (6%); postseason year-3: N=8/33 (24%) vs N=1/13 (8%), p=0.005 change over time). In stratified models, black race was associated with acquired C-LVH in NLM (OR: 3.70, 95% CI 1.12 to 12.21, p=0.03) and LM was associated with acquired C-LVH in white athletes (OR: 3.40, 95% CI 1.03 to 11.27, p=0.048).ConclusionsIndependent of family income and changes in weight and blood pressure, black race was associated with acquired C-LVH among collegiate ASF NLM and LM was associated with acquired C-LVH in white athletes.
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- 2021
8. Exercise Blood Pressure Changes and Aortic Dilatation in Male Masters Endurance Athletes
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Jason V Tso, Casey G Turner, Chang Liu, Arthur B Miller, Danny J Eapen, Laurence S Sperling, and Jonathan H Kim
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Epidemiology ,Cardiology and Cardiovascular Medicine - Published
- 2022
9. Effect of Oral Contraceptive Phase on Mechanisms of Cutaneous Microvascular Function
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Casey G. Turner, Samantha McHugh‐McGlothin, and Brett J. Wong
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Genetics ,Molecular Biology ,Biochemistry ,Biotechnology - Published
- 2022
10. Inhibition of iNOS augments cutaneous endothelial NO-dependent vasodilation in prehypertensive non-Hispanic Whites and in non-Hispanic Blacks
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Jeffrey S. Otis, Brett J. Wong, Matthew J. Hayat, Casey G Turner, Yesser Sebeh, James T. Miller, and Arshed A. Quyyumi
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Adult ,Male ,medicine.medical_specialty ,Microdialysis ,Adolescent ,Physiology ,Nitric Oxide Synthase Type II ,Vasodilation ,medicine.disease_cause ,Nitric Acid ,White People ,Prehypertension ,Nitric oxide ,Young Adult ,chemistry.chemical_compound ,Downregulation and upregulation ,Physiology (medical) ,Internal medicine ,medicine ,Humans ,Enzyme Inhibitors ,Skin ,biology ,Chemistry ,Microcirculation ,Non-Hispanic whites ,Black or African American ,Nitric oxide synthase ,NG-Nitroarginine Methyl Ester ,Endocrinology ,Case-Control Studies ,biology.protein ,Female ,Endothelium, Vascular ,Cardiology and Cardiovascular Medicine ,Oxidative stress ,Signal Transduction ,Research Article - Abstract
We tested the hypothesis that inducible nitric oxide synthase (iNOS) contributes to reduced nitric oxide (NO)-dependent vasodilation in non-Hispanic Blacks and prehypertensive non-Hispanic Whites. Twenty Black and twenty White participants (10 normotensive, 10 prehypertensive per group; n = 40 total) participated in this study. Participants were instrumented with two microdialysis fibers, and each site was randomized as control (lactated Ringer) or iNOS inhibition (0.1 mM 1400W). Laser-Doppler flow probes and local heaters were used to measure skin blood flow and heat the skin to induce vasodilation, respectively. Each site was heated from 33°C to 39°C (rate: 0.1°C/s). Once a plateau was established, 20 mM nitro-l-arginine methyl ester (l-NAME), a nonspecific NOS inhibitor, was infused at each site to quantify NO-dependent vasodilation. At control sites, %NO-dependent vasodilation was reduced in prehypertensive Whites (47 ± 10%NO) and in both normotensive and prehypertensive Blacks (39 ± 9%NO and 28 ± 5%NO, respectively) relative to normotensive Whites (73 ± 8%NO; P < 0.0001 for all comparisons). Compared with respective control sites, iNOS inhibition increased NO-dependent vasodilation in prehypertensive Whites (68 ± 8%NO) and in both normotensive and prehypertensive Blacks (78 ± 8%NO and 55 ± 6%NO, respectively; P < 0.0001 for all comparisons). We failed to find an effect for normotensive Whites (77 ± 7%NO). After iNOS inhibition, %NO-dependent vasodilation was similar between normotensive Whites, prehypertensive Whites, and normotensive Blacks. Inhibition of iNOS increased NO-dependent vasodilation to a lesser extent in prehypertensive Blacks. These data suggest that iNOS contributes to reduced NO-dependent vasodilation in prehypertension and in Black participants. NEW & NOTEWORTHY Inducible nitric oxide synthase (iNOS) is typically upregulated in conditions of increased oxidative stress and may have detrimental effects on the vasculature. Endothelial nitric oxide (NO), which is cardioprotective, is reduced in prehypertensive non-Hispanic Whites and in non-Hispanic Blacks. We found that inhibition of iNOS can increase endothelial NO-dependent vasodilation in prehypertensive White participants and in both normotensive and prehypertensive Black participants.
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- 2021
11. Hypertension and Ventricular-Arterial Uncoupling in Collegiate American Football Athletes
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Jason V. Tso, Casey G. Turner, Chang Liu, Syed Ahmad, Abbas Ali, Steve Selvaraj, Angelo Galante, Carla R. Gilson, Craig Clark, B. Robinson Williams, Arshed A. Quyyumi, Aaron L. Baggish, and Jonathan H. Kim
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Athletes ,Systole ,Hypertension ,Football ,Humans ,Blood Pressure ,Stroke Volume ,Cardiology and Cardiovascular Medicine ,Ventricular Function, Left - Abstract
Background Ventricular–arterial (VA) coupling is defined as the ratio between arterial elastance (EA) and left ventricular elastance (ELV). VA uncoupling, as occurs in hypertensive heart disease, is associated with adverse outcomes. This study sought to determine the relationship between American football (AF)–associated hypertension and VA uncoupling. Methods and Results This was a multicenter, longitudinal, and repeated measures observational study of collegiate AF athletes across 3 years of AF participation. Of 200 freshman athletes initially enrolled, 142 (67 Black [47%]/75 White [53%], 58 linemen [41%]/84 nonlinemen [59%]) were prospectively studied with echocardiography and applanation tonometry. Primary echocardiographic VA coupling outcome measures were EA/ELV and ΔEA/ELV, with increased EA/ELV indicating VA uncoupling. Adjusting for race and player position, AF athletes demonstrated increased EA/ELV (mean [95% CI]Δ, 0.10 [0.04–0.15]; P =0.001) and systolic blood pressure (SBP) (mean [95% CI]Δ, 11.4 [8.3–14.5] mm Hg, P P P =0.02), lower E′ (β=−0.010, P =0.03), and worse global longitudinal strain (β=0.036, P P =0.02) and worsened global longitudinal strain (Δglobal longitudinal strain, β=0.045, P Conclusions VA uncoupling is associated with pathologically increased SBP and subclinical impairments in left ventricular systolic function in collegiate AF athletes, indicating a key mechanism underlying maladaptive cardiovascular phenotypes observed in this population. Future studies analyzing whether targeted clinical interventions improve VA coupling and health outcomes are warranted.
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- 2022
12. Endothelium‐Independent, but Not Endothelium‐Dependent, Human Microvascular Vasodilation Differs Between Young, Healthy Females and Males
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Casey G Turner, Anna E. Stanhewicz, and Brett J. Wong
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medicine.medical_specialty ,Endothelium ,business.industry ,Vasodilation ,Endothelium dependent ,Biochemistry ,medicine.anatomical_structure ,Endocrinology ,Internal medicine ,Genetics ,Medicine ,business ,Molecular Biology ,Biotechnology - Published
- 2021
13. Independent and Cumulative Effects of Superoxide and iNOS on Cutaneous NO‐Dependent Vasodilation in Normotensive Non‐Hispanic Blacks and Whites
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Casey G Turner, Brett J. Wong, and James A. Miller
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medicine.medical_specialty ,Superoxide ,business.industry ,Cumulative effects ,Vasodilation ,Biochemistry ,chemistry.chemical_compound ,Endocrinology ,chemistry ,Internal medicine ,Genetics ,medicine ,business ,Molecular Biology ,Biotechnology - Published
- 2021
14. Berry-Derived Polyphenols in Cardiovascular Pathologies: Mechanisms of Disease and the Role of Diet and Sex
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Rami Najjar, Rafaela G. Feresin, Casey G Turner, and Brett J. Wong
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0301 basic medicine ,sex differences ,berries ,heart failure ,Inflammation ,lcsh:TX341-641 ,Disease ,Berry ,Review ,030204 cardiovascular system & hematology ,Bioinformatics ,medicine.disease_cause ,sex hormones ,Pathogenesis ,03 medical and health sciences ,0302 clinical medicine ,cardiovascular disease ,medicine ,Humans ,Pathological ,polyphenols ,remodeling ,Sex Characteristics ,Nutrition and Dietetics ,business.industry ,apoptosis ,food and beverages ,Biological sex ,Diet ,Gastrointestinal Microbiome ,Oxidative Stress ,030104 developmental biology ,Receptors, Estrogen ,Polyphenol ,Cardiovascular Diseases ,inflammation ,Fruit ,Linear Models ,medicine.symptom ,business ,lcsh:Nutrition. Foods and food supply ,Oxidative stress ,Food Science - Abstract
Cardiovascular disease (CVD) prevalence, pathogenesis, and manifestation is differentially influenced by biological sex. Berry polyphenols target several signaling pathways pertinent to CVD development, including inflammation, oxidative stress, and cardiac and vascular remodeling, and there are innate differences in these pathways that also vary by sex. There is limited research systematically investigating sex differences in berry polyphenol effects on these pathways, but there are fundamental findings at this time that suggest a sex-specific effect. This review will detail mechanisms within these pathological pathways, how they differ by sex, and how they may be individually targeted by berry polyphenols in a sex-specific manner. Because of the substantial polyphenolic profile of berries, berry consumption represents a promising interventional tool in the treatment and prevention of CVD in both sexes, but the mechanisms in which they function within each sex may vary.
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- 2021
15. A Hidden Threat: Anomalous Aortic Origins of the Coronary Arteries in Athletes
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Casey G Turner, Jason Tso, and Jonathan H. Kim
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medicine.medical_specialty ,biology ,Athletes ,business.industry ,030204 cardiovascular system & hematology ,Surgical correction ,medicine.disease ,biology.organism_classification ,Article ,Sudden cardiac death ,Coronary arteries ,03 medical and health sciences ,0302 clinical medicine ,medicine.anatomical_structure ,Left coronary artery ,Right coronary artery ,medicine.artery ,Epidemiology ,medicine ,030212 general & internal medicine ,Cardiology and Cardiovascular Medicine ,Intensive care medicine ,business ,Cardiac imaging - Abstract
PURPOSE OF REVIEW: Anomalous aortic origins of the coronary arteries (AAOCA) are a primary cause of sudden cardiac death in athletes. This review will detail the epidemiology, pathophysiology, and risk stratification of AAOCA, while also highlighting return-to-play considerations for athletes. RECENT FINDINGS: Sport pre-participation cardiovascular screening methods lack sensitivity and specificity in the identification of AAOCA. For the symptomatic athlete, clinicians must maintain a heightened clinical suspicion for AAOCA in order to proceed with appropriate cardiac imaging and functional assessments. Anomalous origin of the left coronary artery with an interarterial course is considered high-risk and requires sport restriction until surgical correction. In contrast, risks associated with anomalous origin of the right coronary artery are controversial, thus management and sports eligibility decisions may incorporate principles of shared-decision making. SUMMARY: Management options for athletes with AAOCA are complex, requiring a comprehensive clinical evaluation. While advances in multimodality cardiovascular imaging and physiologic functional assessments have improved AAOCA risk stratification, best practice treatment strategies for some AAOCA subtypes remain uncertain. As such, clinical management and sport eligibility decisions require an individualized approach. Future prospective data will guide optimization of treatment strategies for athletes with AAOCA.
- Published
- 2020
16. Female Sex Hormone Effects on the Vasculature: Considering the Validity of Restricting Study Inclusion to Low-Hormone Phases
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Anna E. Stanhewicz, Brett J. Wong, and Casey G Turner
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medicine.drug_class ,Female sex hormones ,Physiology ,media_common.quotation_subject ,Estrogen receptor ,030204 cardiovascular system & hematology ,lcsh:Physiology ,vascular function ,External validity ,03 medical and health sciences ,0302 clinical medicine ,Physiology (medical) ,experimental practices ,estrogen ,external validity ,Medicine ,female sex hormones ,Menstrual cycle ,media_common ,030219 obstetrics & reproductive medicine ,lcsh:QP1-981 ,business.industry ,Female sex ,Estrogen ,Perspective ,business ,Vascular function ,Hormone ,estrogen receptor - Abstract
Many studies of vascular function limit the testing of premenopausal female participants to periods when female sex hormones, either endogenous or exogenous, are at their lowest concentration. This practice, when not part of the specific research question, may limit data surrounding the predominant physiological state of premenopausal females and pose a threat to external validity. In this Perspective, we briefly review the literature on the effect of female sex hormones on vascular function and discuss when limiting experimental testing to a certain phase of the menstrual cycle (MC) or oral contraceptive (OC) use may be appropriate. The goal of this Perspective is to open a dialog that may enhance data validity and the overall understanding of vascular function in premenopausal females.
- Published
- 2020
17. Sensory nerve-mediated and nitric oxide-dependent cutaneous vasodilation in normotensive and prehypertensive non-Hispanic blacks and whites
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Arshed A. Quyyumi, Casey G Turner, Jeffrey S. Otis, Yesser Sebeh, Matthew J. Hayat, Demetria C Walker, Brett J. Wong, and James T. Miller
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Adult ,Male ,medicine.medical_specialty ,Georgia ,Endothelium ,Adolescent ,Sensory Receptor Cells ,Physiology ,Microdialysis ,Vasodilator Agents ,Vasodilation ,Sensory system ,Blood Pressure ,Administration, Cutaneous ,Nitric Oxide ,Prehypertension ,White People ,Nitric oxide ,chemistry.chemical_compound ,Young Adult ,Physiology (medical) ,Internal medicine ,medicine ,Humans ,Anesthetics, Local ,Enzyme Inhibitors ,Skin ,business.industry ,Endothelial Cells ,Race Factors ,Black or African American ,medicine.anatomical_structure ,Blood pressure ,Endocrinology ,chemistry ,Case-Control Studies ,Blood Vessels ,Axon reflex ,Female ,Nitric Oxide Synthase ,Cardiology and Cardiovascular Medicine ,business ,Sensory nerve ,Research Article - Abstract
The purpose of this study was to investigate the effect of race and subclinical elevations in blood pressure (i.e., prehypertension) on cutaneous sensory nerve-mediated and nitric oxide (NO)-dependent vasodilation. We recruited participants who self-identified as either non-Hispanic black (n = 16) or non-Hispanic white (n = 16). Within each group, participants were subdivided as either normotensive (n = 8 per group) or prehypertensive (n = 8 per group). Each participant was instrumented with four intradermal microdialysis fibers: 1) control (lactated Ringer’s), 2) 5% lidocaine (sensory nerve inhibition), 3) 20 mM N(ω)-nitro-l-arginine methyl ester (l-NAME) (NO synthase inhibition), and 4) lidocaine + l-NAME. Skin blood flow was assessed via laser-Doppler flowmetry, and each site underwent local heating from 33°C to 39°C. At the plateau, 20 mM l-NAME were infused at control and lidocaine sites to quantify NO-dependent vasodilation. Maximal vasodilation was induced via 54 mM sodium nitroprusside and local heating to 43°C. Data are means ± SD. Sensory nerve-mediated cutaneous vasodilation was reduced in prehypertensive non-Hispanic white (34 ± 7%) and both non-Hispanic black groups (normotensive, 20 ± 9%, prehypertensive, 24 ± 15%) relative to normotensive non-Hispanic whites (54 ± 12%). NO-dependent vasodilation was also reduced in prehypertensive non-Hispanic white (41 ± 7%) and both non-Hispanic black groups (normotensive, 44 ± 7%, prehypertensive, 19 ± 7%) relative to normotensive non-Hispanic whites (60 ± 11%). The decrease in NO-dependent vasodilation in prehypertensive non-Hispanic blacks was further reduced relative to all other groups. These data suggest subclinical increases in blood pressure adversely affect sensory-mediated and NO-dependent vasodilation in both non-Hispanic blacks and whites. NEW & NOTEWORTHY Overt hypertension is known to reduce cutaneous sensory nerve-mediated and nitric oxide (NO)-dependent vasodilation, but the effect of subclinical increases in blood pressure (i.e., prehypertension) is unknown. The combined effect of race and prehypertension is also unknown. In this study, we found that prehypertension reduces cutaneous sensory nerve-mediated and NO-dependent vasodilation in both non-Hispanic white and black populations, with the greatest reductions observed in prehypertensive non-Hispanic blacks. Listen to this article's corresponding podcast at https://ajpheart.podbean.com/e/race-blood-pressure-and-microvascular-function/.
- Published
- 2020
18. Cutaneous sensory nerve‐mediated microvascular vasodilation in normotensive and prehypertensive non‐Hispanic Blacks and Whites
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Casey G Turner, Jeffrey S. Otis, Matthew J. Hayat, Brett J. Wong, James T. Miller, and Arshed A. Quyyumi
- Subjects
Adult ,Male ,Nitroprusside ,Microdialysis ,medicine.medical_specialty ,skin ,Adolescent ,Sensory Receptor Cells ,Physiology ,Vasodilator Agents ,Black People ,Blood Pressure ,Vasodilation ,030204 cardiovascular system & hematology ,White People ,Prehypertension ,lcsh:Physiology ,Nitric oxide ,Young Adult ,03 medical and health sciences ,No bioavailability ,chemistry.chemical_compound ,0302 clinical medicine ,nitric oxide ,Physiology (medical) ,Internal medicine ,medicine ,Humans ,human ,Enzyme Inhibitors ,Original Research ,Subclinical infection ,lcsh:QP1-981 ,business.industry ,United States ,Cutaneous sensory nerve ,NG-Nitroarginine Methyl Ester ,Endocrinology ,chemistry ,Hypertension ,Microvessels ,Female ,Sodium nitroprusside ,business ,030217 neurology & neurosurgery ,medicine.drug - Abstract
Relative to non‐Hispanic Whites, non‐Hispanic Blacks are disproportionately affected by elevated blood pressure (BP). It is unknown whether race or subclinical increases in BP affect the ability of cutaneous sensory nerves to induce cutaneous microvascular vasodilation. Sixteen participants who self‐identified as non‐Hispanic Black (n = 8) or non‐Hispanic White (n = 8) were subgrouped as normotensive or prehypertensive. Participants were instrumented with three intradermal microdialysis fibers: (a) control, (b) 1 μM sodium nitroprusside (SNP), an exogenous nitric oxide (NO) donor, and (c) 20 mM NG‐nitro‐l‐arginine methyl ester (L‐NAME), a non‐selective NO synthase inhibitor. A slow local heating protocol (33–40°C, 0.1°C/min) was used to assess the onset of cutaneous sensory nerve‐mediated vasodilation (temperature threshold) and skin blood flow was measured using laser‐Doppler flowmetry. At control sites, the temperature threshold occurred at a higher temperature in non‐Hispanic Blacks (normotensive: 37.2 ± 0.6°C, prehypertensive: 38.9 ± 0.5°C) compared to non‐Hispanic Whites (normotensive: 35.2 ± 0.8°C, prehypertensive: 35.2 ± 0.9°C). L‐NAME shifted the temperature threshold higher in non‐Hispanic Whites (normotensive: 37.8 ± 0.7°C, prehypertensive: 38.2 ± 0.8°C), but there was no observed effect in non‐Hispanic Blacks. SNP did not affect temperature threshold in non‐Hispanic Whites, but shifted the temperature threshold lower in non‐Hispanic Blacks (normotensive: 34.6 ± 1.2°C, prehypertensive: 34.8 ± 1.1°C). SNP mitigated differences in temperature threshold across all groups. There was no effect found for BP status in either the non‐Hispanic Black or non‐Hispanic White groups. These data suggest that reduced NO bioavailability affects the ability of cutaneous sensory nerves to induce microvascular vasodilation in young, otherwise healthy non‐Hispanic Blacks., Cutaneous sensory nerve activation is shifted to a higher temperature threshold in non‐Hispanic Blacks relative to non‐Hispanic Whites. Administration of exogenous nitric oxide via nitroprusside lowered the temperature threshold in non‐Hispanic Blacks but not in non‐Hispanic Whites.
- Published
- 2020
19. THE ASSOCIATION BETWEEN INCREASED BLOOD PRESSURE RESPONSE TO EXERCISE AND AORTIC DILATATION IN MALE MASTER ENDURANCE ATHLETES
- Author
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Adam Jamnik, Jason Tso, Danny J. Eapen, Arthur S. Miller, Casey G Turner, Laurence S. Sperling, and Jonathan H. Kim
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Aortic dilatation ,medicine.medical_specialty ,Blood pressure ,biology ,business.industry ,Athletes ,Internal medicine ,Cardiology ,Medicine ,Cardiology and Cardiovascular Medicine ,business ,biology.organism_classification - Published
- 2021
20. THE ASSOCIATION BETWEEN RACE AND ACQUIRED LEFT VENTRICULAR HYPERTROPHY IN AMERICAN-STYLE FOOTBALL ATHLETES
- Author
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Craig Clark, Arshed A. Quyyumi, Casey G Turner, Jason Tso, Chang Liu, Angelo Galante, Aaron L. Baggish, Carla Gilson, Jonathan H. Kim, and Herman A. Taylor
- Subjects
biology ,business.industry ,Athletes ,Football ,biology.organism_classification ,Left ventricular hypertrophy ,medicine.disease ,Style (sociolinguistics) ,Race (biology) ,Medicine ,Cardiology and Cardiovascular Medicine ,business ,Association (psychology) ,Clinical psychology - Published
- 2021
21. HYPERTENSION AND IMPAIRED LEFT VENTRICULAR SYSTOLIC FUNCTION PREDICT VENTRICULAR-ARTERIAL UNCOUPLING IN AMERICAN-STYLE FOOTBALL ATHLETES
- Author
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Aaron L. Baggish, Chang Liu, Craig Clark, Casey G Turner, Carla Gilson, Jason Tso, Steve Selvaraj, Syed Ahmad, Byron Williams, Jonathan H. Kim, Angelo Galante, Arshed A. Quyyumi, and Abbas Ali
- Subjects
medicine.medical_specialty ,biology ,Athletes ,business.industry ,Internal medicine ,Cardiology ,medicine ,Systolic function ,Football ,Cardiology and Cardiovascular Medicine ,biology.organism_classification ,business - Published
- 2021
22. Effect of Physical Activity on Oxidative Stress and Endothelial‐Dependent Cutaneous Microvascular Function in Non‐Hispanic Blacks: A Pilot Study
- Author
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Casey G Turner, James T. Miller, and Brett J. Wong
- Subjects
medicine.medical_specialty ,business.industry ,Physical activity ,medicine.disease_cause ,Biochemistry ,Endocrinology ,Internal medicine ,Genetics ,medicine ,business ,Molecular Biology ,Oxidative stress ,Function (biology) ,Biotechnology - Published
- 2020
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