20 results on '"Hopkins LB"'
Search Results
2. Participant Experiences from a Randomized Controlled Trial of Heated Yoga for Depression.
- Author
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Nyer MB, Ding GA, Norton RJ, Nagaswami MV, Tuchman S, Fisher LB, Hopkins LB, Giollabhui NM, Koontz J, Mason AE, Cusin C, Foster S, Yeung A, Jain FA, Sorensen CEC, Streeter C, Miller KK, Fava M, Uebelacker L, and Mischoulon D
- Subjects
- Humans, Male, Female, Middle Aged, Adult, Treatment Outcome, Yoga, Depression therapy
- Abstract
Despite decades of research on yoga and depression, subjective experiences of participants in these studies have rarely been reported, and never in individuals receiving heated yoga for depression. We examined patient-reported qualitative findings from an 8-week randomized controlled trial of heated yoga for depression. Eighty medically healthy participants with moderate-to-severe depression were randomized to 8 weeks of at least twice-weekly heated yoga classes, derived from Bikram yoga, or a waitlist control. Fifty-seven participants received a clinician-administered exit interview at intervention completion/study withdrawal. The exit interview assessed: (1) how participants felt immediately following the heated yoga sessions (acute effects), (2) what they liked or found helpful about heated yoga over the 8-week intervention (positive effects), and (3) what they disliked/did not find helpful over the 8-week intervention (negative effects). Qualitative data were analyzed using thematic analysis. Acute improvements in depressive symptoms (i.e., immediately following yoga) were the most commonly reported (n = 44, 77.2%), followed by overall positive effects on depressive symptoms (i.e., over the course of the 8-week intervention; n = 33, 57.9%), including improvements in sleep (n = 10, 17.5%), energy (n = 13, 22.8%), mood (n = 18, 31.6%), motivation (n = 2, 3.5%), and concentration/decision-making (n = 5, 8.8%). Overall negative effects (i.e., over the course of the 8-week intervention) included dislike of various aspects of the intervention (n = 19, 33.3%), such as instruction (n = 7, 12.3%), difficulty (n = 7, 12.3%), repetitiveness (n = 3, 5.3%), class length (n = 2, 3.5%), and boredom (n = 7, 12.3%). Most participants reported both overall positive and negative effects (n = 37, 64.9%). Of the rest, 19 (33.3%) reported only overall positive effects, and 1 (1.8%) reported only overall negative effects. Most participant experiences were positive. Negative effects were less common and primarily involved dislike of different aspects of the heated yoga. The findings support strong acceptability and subjective improvement in depressive symptoms in depressed individuals.
- Published
- 2024
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3. A Randomized Controlled Trial of Community-Delivered Heated Hatha Yoga for Moderate-to-Severe Depression.
- Author
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Nyer MB, Hopkins LB, Nagaswami M, Norton R, Streeter CC, Hoeppner BB, Sorensen CEC, Uebelacker L, Koontz J, Foster S, Dording C, Giollabhui NM, Yeung A, Fisher LB, Cusin C, Jain FA, Pedrelli P, Ding GA, Mason AE, Cassano P, Mehta DH, Sauder C, Raison CL, Miller KK, Fava M, and Mischoulon D
- Subjects
- Adult, Female, Humans, Male, Depression therapy, Yoga
- Abstract
Objective: To evaluate feasibility, acceptability, and preliminary efficacy of heated yoga to treat moderate-to-severe depression., Design: An 8-week randomized controlled trial (RCT) of heated yoga versus waitlist control was conducted from March 2017 to August 2019., Methods: Participants in the yoga condition were asked to attend heated yoga classes at 2 community heated yoga studios at least twice weekly. We assessed acceptability and feasibility using exit interview and attendance data, respectively. The primary intervention efficacy outcome variable was change in the Inventory of Depressive Symptomatology-Clinician Rated (IDS-CR) score from baseline to post-intervention (week 8)., Results: We randomized 80 participants and included 65 (mean [± SD] age 32.7 [± 11.7] years; 81.5% female) in the analyses (yoga n = 33, waitlist n = 32). The mean IDS-CR score at baseline was 35.6 (± 7.9) for the full sample, 36.9 (± 8.8) for yoga participants, and 34.4 (± 6.7) for waitlist participants. Participants attended an average of 10.3 (± 7.1) total classes over the 8-week intervention period. Yoga participants had a significantly greater pre- to post-intervention reduction in IDS-CR scores than waitlist participants (Cohen d = 1.04, P < .001). More yoga participants (59.3%; n = 16) than waitlist participants (6.3%; n = 2) evidenced larger treatment responses (IDS-CR ≥ 50% decrease in symptoms). Participants rated the heated yoga and its aftereffects positively in exit interviews., Conclusions: Approximately 1 heated yoga session per week (mean of 10.3 classes over 8 weeks) was associated with significantly greater reduction in depression symptoms than a waitlist control. Participants rated heated yoga positively. Taken together, results suggest feasibility, acceptability, and preliminary efficacy for patients with depression and warrant further research using active control conditions., Trial Registration: ClinicalTrials.gov identifier: NCT02607514., (© Copyright 2023 Physicians Postgraduate Press, Inc.)
- Published
- 2023
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4. Thermal decoupling of deuterium and tritium during the inertial confinement fusion shock-convergence phase.
- Author
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Kabadi NV, Simpson R, Adrian PJ, Bose A, Frenje JA, Gatu Johnson M, Lahmann B, Li CK, Parker CE, Séguin FH, Sutcliffe GD, Petrasso RD, Atzeni S, Eriksson J, Forrest C, Fess S, Glebov VY, Janezic R, Mannion OM, Rinderknecht HG, Rosenberg MJ, Stoeckl C, Kagan G, Hoppe M, Luo R, Schoff M, Shuldberg C, Sio HW, Sanchez J, Hopkins LB, Schlossberg D, Hahn K, and Yeamans C
- Abstract
A series of thin glass-shell shock-driven DT gas-filled capsule implosions was conducted at the OMEGA laser facility. These experiments generate conditions relevant to the central plasma during the shock-convergence phase of ablatively driven inertial confinement fusion (ICF) implosions. The spectral temperatures inferred from the DTn and DDn spectra are most consistent with a two-ion-temperature plasma, where the initial apparent temperature ratio, T_{T}/T_{D}, is 1.5. This is an experimental confirmation of the long-standing conjecture that plasma shocks couple energy directly proportional to the species mass in multi-ion plasmas. The apparent temperature ratio trend with equilibration time matches expected thermal equilibration described by hydrodynamic theory. This indicates that deuterium and tritium ions have different energy distributions for the time period surrounding shock convergence in ignition-relevant ICF implosions.
- Published
- 2021
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5. Factor VIII-Fc Activates Natural Killer Cells via Fc-Mediated Interactions With CD16.
- Author
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Lagassé HAD, Hopkins LB, Jankowski W, Jacquemin MG, Sauna ZE, and Golding B
- Subjects
- B-Lymphocytes immunology, Cell Degranulation, GPI-Linked Proteins immunology, Humans, Immune Tolerance, Interferon-gamma immunology, Factor VIII pharmacology, Hemostatics pharmacology, Immunoglobulin Fc Fragments pharmacology, Killer Cells, Natural immunology, Receptors, IgG immunology, Recombinant Fusion Proteins pharmacology
- Abstract
The most challenging complication associated with Factor VIII (FVIII) replacement therapy is the development of neutralizing anti-drug antibodies, or inhibitors, which occur in 23-35% of severe (FVIII level <1%) hemophilia A (HA) patients and are a serious hindrance to effective management of HA. Consequently, strategies that can either prevent anti-FVIII inhibitors from developing or "tolerize" individuals who develop such antibodies represent a clinically important unmet need. One intervention for patients with high-titer inhibitors is immune tolerance induction (ITI) therapy. Although ITI therapy is the only clinically proven strategy to eradicate anti-FVIII inhibitors, mechanisms of inhibitor reduction remain unknown. Factor VIII Fc-fusion (rFVIIIFc) is an enhanced half-life antihemophilic factor used in replacement therapy for HA. Fc-fusion is a successful protein bio-engineering platform technology. In addition to enhancement of plasma half-life via neonatal Fc receptor (FcRn) binding, other Fc-mediated interactions, including engagement with Fc gamma receptors (FcγR), may have immunological consequences. Several case reports and retrospective analyses suggest that rFVIIIFc offers superior outcomes with respect to ITI compared to other FVIII products. Previously we and others demonstrated rFVIIIFc interactions with activating FcγRIIIA/CD16. Here, we investigated if rFVIIIFc activates natural killer (NK) cells via CD16. We demonstrated rFVIIIFc signaling via CD16 independent of Von Willebrand Factor (VWF):FVIII complex formation. We established that rFVIIIFc potently activated NK cells in a CD16-dependent fashion resulting in IFNγ secretion and cytolytic perforin and granzyme B release. We also demonstrated an association between rFVIIIFc-mediated NK cell IFNγ secretion levels and the high-affinity (158V) CD16 genotype. Furthermore, we show that rFVIIIFc-activated CD16
+ NK cells were able to lyse a B-cell clone (BO2C11) bearing an anti-FVIII B-cell receptor in an antibody-dependent cellular cytotoxicity (ADCC) assay. These in vitro findings provide an underlying molecular mechanism that may help explain clinical case reports and retrospective studies suggesting rFVIIIFc may be more effective in tolerizing HA patients with anti-FVIII inhibitors compared to FVIII not linked to Fc. Our in vitro findings suggest a potential use of Fc-fusion proteins acting via NK cells to target antigen-specific B-cells, in the management of unwanted immune responses directed against immunogenic self-antigens or therapeutic protein products., Competing Interests: MJ reports grants from Bayer, Takeda, Pfizer and Sobi, outside the submitted work. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2021 Lagassé, Hopkins, Jankowski, Jacquemin, Sauna and Golding.)- Published
- 2021
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6. A Qualitative Examination of Stay Quit Coach, A Mobile Application for Veteran Smokers With Posttraumatic Stress Disorder.
- Author
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Herbst E, McCaslin SE, Hassanbeigi Daryani S, Laird KT, Hopkins LB, Pennington D, and Kuhn E
- Subjects
- Adolescent, Adult, Aged, Behavior Therapy methods, Female, Humans, Male, Middle Aged, Patient Compliance, Qualitative Research, Smokers, Smoking epidemiology, Smoking psychology, Surveys and Questionnaires, Veterans statistics & numerical data, Young Adult, Cell Phone statistics & numerical data, Health Behavior, Mobile Applications standards, Smoking therapy, Smoking Cessation methods, Stress Disorders, Post-Traumatic complications, Veterans psychology
- Abstract
Introduction: Smoking is a lethal public health problem that is common in US military veterans, particularly those with posttraumatic stress disorder (PTSD). Mobile applications (apps) to promote smoking cessation are a scalable and low-cost approach that may facilitate treatment engagement., Methods: This qualitative study examined the acceptability, user experience, and perceptions of a smoking cessation app, Stay Quit Coach (SQC), when incorporated into evidence-based smoking cessation treatment. US military veterans with PTSD who smoked at least five cigarettes per day for 15 of the past 30 days and stated an interested in cessation were eligible to participate. Participants' baseline comfort levels with mobile technology was measured using the Perceptions of Mobile Phone Interventions Questionnaire-Patient version (PMPIQ-P). At treatment end, semi-structured qualitative interviews were conducted., Results: Twenty participants were enrolled and 17 (85.0%) participated in the qualitative interview at treatment end. PMPIQ-P scores at baseline ranged from 4.97 to 5.25 (SDs = 0.73-1.04), reflecting moderately high comfort with mobile technology among participants. Qualitative analyses indicated that most participants: (1) endorsed mobile technology as an appealing format for smoking cessation treatment, due to convenience and instantaneous access; and (2) expressed highest perceived helpfulness for interactive app features. Recommendations to improve SQC clustered into four thematic areas: (1) increasing personalization, (2) including more self-tracking features, (3) increasing visual cues, and (4) sharing progress with peers., Conclusions: SQC was perceived as an acceptable and useful tool to support smoking cessation in a sample of veteran smokers with PTSD. Qualitative data provided valuable insights that can inform the continued development of SQC and other apps for smoking cessation., Implications: Given the high lethality associated with cigarette smoking, it is crucial to identify scalable, low-risk strategies to promote smoking cessation, particularly in high-risk populations. Mobile technology is a promising approach that can be used to augment evidence-based smoking cessation treatment. Results of this qualitative study support the use of the SQC mobile app when incorporated into evidence-based smoking cessation treatment for veterans with PTSD and provide future directions for refinement of the SQC app. These findings also highlight the importance of using a patient-centered approach in designing apps intended for a clinical population., (Published by Oxford University Press on behalf of the Society for Research on Nicotine and Tobacco 2019.)
- Published
- 2020
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7. Diagnostic signature of the compressibility of the inertial-confinement-fusion pusher.
- Author
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Meaney KD, Kim YH, Geppert-Kleinrath H, Herrmann HW, Hopkins LB, and Hoffman NM
- Abstract
Carbon shell areal density measurements from many types of inertial confinement fusion implosions at the National Ignition Facility (NIF) demonstrate that the final state of the outside portion of the shell is set primarily by capsule coast time, the coasting period between main laser shut off and peak fusion output. However, the fuel areal density does not correlate with the increasing carbon compression. While two-dimensional (2D) radiation-hydrodynamic simulations successfully capture the carbon compression, energy must be added to the simulated fuel-ice layer to reproduce fuel areal density measurements. The data presented demonstrates that the degradation mechanisms that reduce the compressibility of the fuel do not reduce the compressibility of the ablator.
- Published
- 2020
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8. Improvement in therapist skills over sessions in brief motivational interventions predicts client language and alcohol use outcomes.
- Author
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Borsari B, Hopkins LB, Manuel JK, Apodaca TR, Mastroleo NR, Jackson KM, Magill M, Norona JC, and Carey KB
- Subjects
- Adolescent, Adult, Female, Humans, Male, Randomized Controlled Trials as Topic, Young Adult, Alcohol Drinking in College, Alcoholism therapy, Clinical Competence statistics & numerical data, Health Personnel education, Mandatory Programs statistics & numerical data, Motivational Interviewing statistics & numerical data, Outcome and Process Assessment, Health Care statistics & numerical data
- Abstract
Brief motivational interventions (BMIs) are widely used and efficacious interventions that address alcohol misuse in mandated college students. Consistent with motivational interviewing (MI; Miller & Rollnick, 2013) theory, within-therapist improvements in MI-consistent (MICO) skills over time-that is, as a therapist gains skill through repeated practice-may be associated with concurrent increases in client change language and subsequent changes in behavior. This study examined how therapist skill changed over time and whether within-therapist improvement in MICO skills impacted in-session client change language and subsequent alcohol-related outcomes. BMI sessions ( N = 228) from 2 randomized clinical trials that had led to significant reductions in alcohol use and alcohol-related problems in mandated student drinkers were coded using the Motivational Interviewing Skills Code 2.0 (Miller, Moyers, Ernst, & Amrhein, 2003). In both studies, the BMI consisted of a single 45- to 60-min session. Analyses examined session-by-session changes in therapist MICO skills, client change language, and alcohol use outcomes. Therapist MICO skills improved over time, and there were significant increases in client change language and decreases in client discussion of topics other than personal alcohol use. Among relatively heavy-drinking clients, those treated by a more experienced therapist demonstrated greater reductions in alcohol use; however, this association was not mediated by client change language. Increased experience conducting BMIs improved therapist MICO skills over time, which in turn increased the focus on personal alcohol use during the session. However, it remains unclear how client language predicts behavior change following a BMI. (PsycINFO Database Record (c) 2019 APA, all rights reserved).
- Published
- 2019
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9. Community-Delivered Heated Hatha Yoga as a Treatment for Depressive Symptoms: An Uncontrolled Pilot Study.
- Author
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Nyer M, Hopkins LB, Farabaugh A, Nauphal M, Parkin S, McKee MM, Miller KK, Streeter C, Uebelacker LA, Fava M, Alpert JE, Pedrelli P, and Mischoulon D
- Subjects
- Adult, Depression therapy, Female, Humans, Male, Middle Aged, Personality Inventory, Pilot Projects, Treatment Outcome, Young Adult, Depressive Disorder, Major therapy, Hot Temperature therapeutic use, Yoga
- Abstract
Objectives: There are no known studies of concurrent exposure to high temperature and yoga for the treatment of depression. This study explored acceptability and feasibility of heated (Bikram) yoga as a treatment for individuals with depressive symptoms. Design: An 8-week, open-label pilot study of heated yoga for depressive symptoms. Subjects: 28 medically healthy adults (71.4% female, mean age 36 [standard deviation 13.57]) with at least mild depressive symptoms (Hamilton Rating Scale for Depression [HRSD-17] score ≥10) who attended at least one yoga class and subsequent assessment visit. Intervention: Participants were asked to attend at least twice weekly community held Bikram Yoga classes. Assessments were performed at screening and weeks 1, 3, 5, and 8. Hypotheses were tested using a modified-intent-to-treat approach, including participants who attended at least one yoga class and subsequent assessment visit ( N = 28). Results: Almost half of our subjects completed the 8-week intervention, and close to a third attended three quarters or more of the prescribed 16 classes over 8 weeks. Multilevel modeling revealed significant improvements over time in both clinician-rated HRSD-17 ( p = 0.003; d
GLMM = 1.43) and self-reported Beck Depression Inventory (BDI; p < 0.001, dGLMM = 1.31) depressive symptoms, as well as the four secondary outcomes: hopelessness ( p = 0.024, dGLMM = 0.57), anxiety ( p < 0.001, dGLMM = 0.78), cognitive/physical functioning ( p < 0.001, dGLMM = 1.34), and quality of life ( p = 0.007, dGLMM = 1.29). Of 23 participants with data through week 3 or later, 12 (52.2%) were treatment responders (≥50% reduction in HRSD-17 score), and 13 (56.5%) attained remission (HRSD score ≤7). More frequent attendance was significantly associated with improvement in self-rated depression symptoms, hopelessness, and quality of life. Conclusions: The acceptability and feasibility of heated yoga in this particular sample with this protocol warrants further attention. The heated yoga was associated with reduced depressive symptoms, and other improved related mental health symptoms, including anxiety, hopelessness, and quality of life.- Published
- 2019
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10. Implementation of the foil-on-hohlraum technique for the magnetic recoil spectrometer for time-resolved neutron measurements at the National Ignition Facility.
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Parker CE, Frenje JA, Johnson MG, Schlossberg DJ, Reynolds HG, Hopkins LB, Bionta R, Casey DT, Felker SJ, Hilsabeck TJ, Kilkenny JD, Li CK, Mackinnon AJ, Robey H, Schoff ME, Séguin FH, Wink CW, and Petrasso RD
- Abstract
The next-generation Magnetic Recoil Spectrometer, called MRSt, will provide time-resolved measurements of the deuterium-tritium-neutron spectrum from inertial confinement fusion implosions at the National Ignition Facility. These measurements will provide critical information about the time evolution of the fuel assembly, hot-spot formation, and nuclear burn. The absolute neutron spectrum in the energy range of 12-16 MeV will be measured with high accuracy (∼5%), unprecedented energy resolution (∼100 keV) and, for the first time ever, time resolution (∼20 ps). Crucial to the design of the system is a CD conversion foil for the production of recoil deuterons positioned as close to the implosion as possible. The foil-on-hohlraum technique has been demonstrated by placing a 1-mm-diameter, 40- μ m-thick CD foil on the hohlraum diagnostic band along the line-of-sight of the current time-integrated MRS system, which measured the recoil deuterons. In addition to providing validation of the foil-on-hohlraum technique for the MRSt design, substantial improvement of the MRS energy resolution has been demonstrated.
- Published
- 2018
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11. Does exercise aid smoking cessation through reductions in anxiety sensitivity and dysphoria?
- Author
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Zvolensky MJ, Rosenfield D, Garey L, Kauffman BY, Langdon KJ, Powers MB, Otto MW, Davis ML, Marcus BH, Church TS, Frierson GM, Hopkins LB, Paulus DJ, Baird SO, and Smits JAJ
- Subjects
- Adult, Female, Humans, Male, Anxiety psychology, Exercise physiology, Smoking Cessation psychology
- Abstract
Objective: Research shows that high anxiety sensitivity (AS) and dysphoria are related to poor smoking cessation outcomes. Engaging in exercise may contribute to improvement in smoking cessation outcomes through reductions in AS and dysphoria. In the current study, we examined whether exercise can aid smoking cessation through reductions in AS and dysphoria., Method: Participants were sedentary and low activity adult daily smokers (N = 136) with elevated AS who participated in a randomized controlled trial comparing smoking cessation treatment (ST) plus an exercise intervention (ST + EX) to ST plus wellness education (ST + CTRL). Self-reported smoking status was assessed in-person weekly from baseline through week 16 (end of-treatment; EOT), at week 22 (4 months postquit day), and at week 30 (6 months postquit day), and verified biochemically., Results: Results indicated that both AS and dysphoria at 6-month follow-up were significantly lower in the ST + EX group compared to the ST + CTRL group (controlling for baseline levels). Moreover, reductions in AS and dysphoria emerged as independent mechanisms of action explaining success in quitting., Conclusions: These novel findings offer clinically significant evidence suggesting that vigorous-intensity exercise can effectively engage affective constructs in the context of smoking cessation. (PsycINFO Database Record, ((c) 2018 APA, all rights reserved).)
- Published
- 2018
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12. Mechanisms of action during a dissonance-based intervention through 14-month follow-up: The roles of body shame and body surveillance.
- Author
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Kilpela LS, Schaumberg KE, Hopkins LB, and Becker CB
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- Adolescent, Adult, Female, Follow-Up Studies, Humans, Young Adult, Body Image psychology, Cognitive Dissonance, Feeding and Eating Disorders psychology, Shame
- Abstract
Objectification theory posits that internalization of societal perspectives about the female body leads to increased body surveillance, which can result in body-related shame and subsequent eating disorder (ED) behaviors. Preliminary research indicates that these associations may be complex in nature. This study examined temporal relations among body surveillance, body shame, and eating disorder symptoms in the context of a dissonance-based body image intervention and through 14-month follow-up. College women (N=285) completed assessments at baseline, post-intervention, and at 8-week, 8-month, and 14-month follow-up. Cross-lag panel analyses revealed that changes in body surveillance significantly mediated the association between body shame and ED symptoms over time. Alternatively, body shame did not change over time and was not a significant mediator of associations between body surveillance and ED symptoms longitudinally. Results indicate that the ameliorative effects of dissonance-based interventions may be due to reductions in body surveillance, rather than decreased body shame., (Copyright © 2017 Elsevier Ltd. All rights reserved.)
- Published
- 2017
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13. Identifying attendance patterns in a smoking cessation treatment and their relationships with quit success.
- Author
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Jacquart J, Papini S, Davis ML, Rosenfield D, Powers MB, Frierson GM, Hopkins LB, Baird SO, Marcus BH, Church TS, Otto MW, Zvolensky MJ, and Smits JAJ
- Subjects
- Adult, Exercise Therapy, Female, Humans, Male, Middle Aged, Patient Dropouts statistics & numerical data, Smoking therapy, Substance-Related Disorders therapy, Treatment Outcome, Patient Acceptance of Health Care statistics & numerical data, Smoking Cessation statistics & numerical data
- Abstract
Background: While important for substance use outcomes, knowledge about treatment attendance patterns, and their relation with clinical outcomes is limited. We examined the association between attendance patterns and smoking outcomes in a randomized, controlled smoking cessation intervention trial., Methods: In addition to standard smoking cessation treatment, participants were randomized to 15 weeks of an exercise intervention (n=72) or an education control condition (n=64). Latent class growth analysis (LCGA) tested whether intervention attendance would be better modeled as qualitatively distinct attendance patterns rather than as a single mean pattern. Multivariate generalized linear mixed modeling (GLMM) was used to evaluate associations between the attendance patterns and abstinence at the end of treatment and at 6-month follow-up., Results: The LCGA solution with three patterns characterized by high probability of attendance throughout (Completers, 46.3%), gradual decreasing probability of attendance (Titrators, 23.5%), and high probability of dropout within the first few weeks (Droppers, 30.1%) provided the best fit. The GLMM analysis indicated an interaction of attendance pattern by treatment condition, such that titration was associated with lower probability of quit success for those in the control condition. Probability of quit success was not significantly different between Titrators and Completers in the exercise condition., Conclusions: These findings underscore the importance of examining how treatment efficacy may vary as a function of attendance patterns. Importantly, treatment discontinuation is not necessarily indicative of poorer abstinence outcome., (Copyright © 2017 Elsevier B.V. All rights reserved.)
- Published
- 2017
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14. Performance of laser sintered Ti-6Al-4V implants with bone-inspired porosity and micro/nanoscale surface roughness in the rabbit femur.
- Author
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Cohen DJ, Cheng A, Sahingur K, Clohessy RM, Hopkins LB, Boyan BD, and Schwartz Z
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- Alloys, Animals, Male, Materials Testing, Rabbits, Surface Properties, Titanium radiation effects, X-Ray Microtomography methods, Femur surgery, Lasers, Nanostructures chemistry, Osseointegration physiology, Porosity, Prosthesis Design methods, Titanium chemistry
- Abstract
Long term success of bone-interfacing implants remains a challenge in compromised patients and in areas of low bone quality. While surface roughness at the micro/nanoscale can promote osteogenesis, macro-scale porosity is important for promoting mechanical stability of the implant over time. Currently, machining techniques permit pores to be placed throughout the implant, but the pores are generally uniform in dimension. The advent of laser sintering provides a way to design and manufacture implants with specific porosity and variable dimensions at high resolution. This approach enables production of metal implants that mimic complex geometries found in biology. In this study, we used a rabbit femur model to compare osseointegration of laser sintered solid and porous implants. Ti-6Al-4V implants were laser sintered in a clinically relevant size and shape. One set of implants had a novel porosity based on human trabecular bone; both sets had grit-blasted/acid-etched surfaces. After characterization, implants were inserted transaxially into rabbit femora; mechanical testing, micro-computed tomography (microCT) and histomorphometry were conducted 10 weeks post-operatively. There were no differences in pull-out strength or bone-to-implant contact. However, both microCT and histomorphometry showed significantly higher new bone volume for porous compared to solid implants. Bone growth was observed into porous implant pores, especially near apical portions of the implant interfacing with cortical bone. These results show that laser sintered Ti-6Al-4V implants with micro/nanoscale surface roughness and trabecular bone-inspired porosity promote bone growth and may be used as a superior alternative to solid implants for bone-interfacing implants.
- Published
- 2017
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15. Heated hatha yoga to target cortisol reactivity to stress and affective eating in women at risk for obesity-related illnesses: A randomized controlled trial.
- Author
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Hopkins LB, Medina JL, Baird SO, Rosenfield D, Powers MB, and Smits JA
- Subjects
- Adult, Bulimia physiopathology, Bulimia psychology, Female, Hot Temperature, Humans, Middle Aged, Obesity psychology, Risk Factors, Saliva chemistry, Stress, Psychological physiopathology, Stress, Psychological psychology, Treatment Outcome, Bulimia therapy, Hydrocortisone analysis, Obesity prevention & control, Stress, Psychological therapy, Yoga
- Abstract
Objective: Cortisol reactivity to stress is associated with affective eating, an important behavioral risk factor for obesity and related metabolic diseases. Yoga practice is related to decreases in stress and cortisol levels, thus emerging as a potential targeted complementary intervention for affective eating. This randomized controlled trial examined the efficacy of a heated, hatha yoga intervention for reducing cortisol reactivity to stress and affective eating., Method: Females (N = 52; ages 25-46 years; 75% White) at risk for obesity and related illnesses were randomly assigned to 8 weeks of Bikram Yoga practice or to waitlist control. Cortisol reactivity to a laboratory stress induction were measured at Weeks 0 (pretreatment) and 9 (posttreatment). Self-reported binge eating frequency and coping motives for eating were assessed at Weeks 0, 3, 6, and 9., Results: Among participants with elevated cortisol reactivity at pretreatment ("high reactors"), those randomized to the yoga condition evidenced greater pre- to posttreatment reductions in cortisol reactivity (p = .042, d = .85), but there were not significant condition differences for the "low reactors" (p = .178, d = .53). Yoga participants reported greater decreases in binge eating frequency (p = .040, d = .62) and eating to cope with negative affect (p = .038, d = .54)., Conclusions: This study provides preliminary support for the efficacy of heated hatha yoga for treating physiological stress reactivity and affective eating among women at risk for obesity-related illnesses. (PsycINFO Database Record, ((c) 2016 APA, all rights reserved).)
- Published
- 2016
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16. The Efficacy of Vigorous-Intensity Exercise as an Aid to Smoking Cessation in Adults With High Anxiety Sensitivity: A Randomized Controlled Trial.
- Author
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Smits JA, Zvolensky MJ, Davis ML, Rosenfield D, Marcus BH, Church TS, Powers MB, Frierson GM, Otto MW, Hopkins LB, Brown RA, and Baird SO
- Subjects
- Adult, Breath Tests, Cognitive Behavioral Therapy methods, Combined Modality Therapy, Female, Follow-Up Studies, Humans, Male, Middle Aged, Tobacco Use Cessation Devices, Anxiety therapy, Exercise Therapy methods, Outcome Assessment, Health Care, Sedentary Behavior, Smoking Cessation methods
- Abstract
Objectives: High anxiety sensitivity predicts poor smoking cessation outcomes. Aerobic exercise reduces anxiety sensitivity and aspects of the risk conferred by anxiety sensitivity. In the current study, we examined whether exercise can aid smoking cessation in adults with high anxiety sensitivity., Methods: Participants were sedentary and low-activity adult daily smokers (n = 136) with elevated prescreen anxiety sensitivity. Participants received 15 weeks of standard smoking cessation treatment (ST; cognitive behavioral therapy plus nicotine replacement therapy). In addition, participants were simultaneously randomized to 15 weeks of either an exercise intervention (ST + EX; n = 72) or a wellness education control condition (ST + CTRL; n = 64). Self-reported smoking abstinence was assessed weekly during the intervention, at the end of treatment (10 weeks after the target quit date), and at 4 and 6 months after the target quit date. Abstinence was verified by expired carbon monoxide readings and saliva cotinine., Results: Results indicated that point prevalence abstinence (PPA) and prolonged abstinence (PA) rates were significantly higher for ST + EX than for ST + CTRL at each of the major end points among persons with high anxiety sensitivity (PPA: b = -0.91, standard error [SE] = 0.393, t(1171) = -2.33, p = .020; PA: b = -0.98, SE = 0.346, t(132) = -2.84, p = .005), but not among those with low anxiety sensitivity (PPA: b = -0.23, SE = 0.218, t(1171) = -1.06, p = .29; PA: b = -0.31, SE = 0.306, t(132) = -1.01, p = .32)., Conclusions: The present results suggest that exercise facilitates the odds of quit success for smokers with high levels of anxiety sensitivity and therefore may be a useful therapeutic tactic for this high-risk segment of the smoking population., Trial Registration: ClinicalTrials.gov, NCT01065506.
- Published
- 2016
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17. Distress Tolerance as a Predictor of Adherence to a Yoga Intervention: Moderating Roles of BMI and Body Image.
- Author
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Baird SO, Hopkins LB, Medina JL, Rosenfield D, Powers MB, and Smits JA
- Subjects
- Adult, Body Mass Index, Female, Humans, Meditation psychology, Obesity psychology, Obesity therapy, Overweight psychology, Overweight therapy, Self Report, Body Image psychology, Patient Compliance psychology, Stress, Psychological psychology, Yoga psychology
- Abstract
This study tested whether distress tolerance, body image, and body mass index (BMI) predicted adherence to a yoga intervention. Participants were 27 women who participated in a yoga intervention as part of a randomized controlled trial. Attendance and distress tolerance were assessed weekly, and body image and BMI were measured at baseline. Multilevel modeling revealed a three-way interaction of distress tolerance, BMI, and body image (p < .001). For participants with few body image concerns, distress tolerance was positively associated with adherence regardless of BMI (p = .009). However, for those with poor body image, increases in distress tolerance were associated with increases in adherence among overweight participants (p < .001) but lower adherence among obese participants (p = .007). Distress tolerance may be implicated in adherence to a yoga intervention, although its effects may be dependent on body image concerns, BMI, and their interaction. Research and clinical implications are discussed., (© The Author(s) 2015.)
- Published
- 2016
- Full Text
- View/download PDF
18. Multibeam Stimulated Raman Scattering in Inertial Confinement Fusion Conditions.
- Author
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Michel P, Divol L, Dewald EL, Milovich JL, Hohenberger M, Jones OS, Hopkins LB, Berger RL, Kruer WL, and Moody JD
- Abstract
Stimulated Raman scattering from multiple laser beams arranged in a cone sharing a common daughter wave is investigated for inertial confinement fusion (ICF) conditions in a inhomogeneous plasma. It is found that the shared electron plasma wave (EPW) process, where the lasers collectively drive the same EPW, can lead to an absolute instability when the electron density reaches a matching condition dependent on the cone angle of the laser beams. This mechanism could explain recent experimental observations of hot electrons at early times in ICF experiments, at densities well below quarter critical when two plasmon decay is not expected to occur.
- Published
- 2015
- Full Text
- View/download PDF
19. Social anxiety and associations with eating psychopathology: Mediating effects of fears of evaluation.
- Author
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Menatti AR, DeBoer LB, Weeks JW, and Heimberg RG
- Subjects
- Adult, Body Mass Index, Feeding and Eating Disorders complications, Female, Humans, Phobic Disorders complications, Students psychology, Young Adult, Body Image psychology, Fear psychology, Feeding and Eating Disorders psychology, Phobic Disorders psychology, Social Behavior
- Abstract
Recent work suggests unique relations among features of social anxiety disorder and eating disorder pathology. Thus, it may be important to determine specific facets of social anxiety that account for the relation between it and eating disorders. Given the similarities in social-evaluative concerns in both sets of symptoms, we hypothesized that fears of both positive and negative evaluation would each independently account for the relationship between social anxiety symptoms and eating pathology among college females (N=167). Results were partially supportive of hypotheses. Fear of negative evaluation independently accounted for a significant portion of the relationship between social anxiety and each domain of eating pathology that was tested, which included Drive for Thinness, Body Dissatisfaction, and Bulimic Symptoms. Body mass index appeared to play a moderating role on the relationship between fear of negative evaluation and body dissatisfaction, but not drive for thinness or bulimia symptoms. Clinical implications including diagnostic and treatment considerations will be discussed., (Copyright © 2015 Elsevier Ltd. All rights reserved.)
- Published
- 2015
- Full Text
- View/download PDF
20. Inner space and outer space identity in contemporary females.
- Author
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Hopkins LB
- Subjects
- Adolescent, Adult, Age Factors, Awareness, Body Image, Cognition, Ego, Female, Gender Identity, Humans, Psychoanalytic Theory, Psychosexual Development, Women psychology
- Abstract
Historically, attempts to achieve experimental confirmation of hypotheses in psychoanalytic theory have been very limited. As Nelson (1976) has pointed out, the psychoanalytic literature is abundantly filled with articles and symposia dealing with the inherent difficulties of psychoanalytic research. This study represents an attempt to translate an area of analytic theory into an experimental paradigm and to use the paradigm in a test of the validity of the theory. The theory being tested in Erikson's (1968) theory of identity formation in females. The findings lead to a suggestion that Erikson's theory is in need of modification as a description of contemporary women. The study is discussed here in the context of Erikson's theory and the analytic writings on the female inner space.
- Published
- 1980
- Full Text
- View/download PDF
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