Bill I. Campbell's research while affiliated with University of South Florida and other places

Publications (26)

Article
Full-text available
The combination of resistance exercise and creatine supplementation has been shown to decrease body fat percentage in adults ≥ 50 years of age. However, the effect on adults < 50 years of age is currently unknown. To address this limitation, we systematically reviewed the literature and performed several meta-analyses comparing studies that include...
Article
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Position Statement: The International Society of Sports Nutrition (ISSN) presents this position based on a critical examination of literature surrounding the effects of essential amino acid (EAA) supplementation on skeletal muscle maintenance and performance. This position stand is intended to provide a scientific foundation to athletes, dietitians...
Poster
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Caffeine is a typical active ingredient within multi-ingredient fat loss supplements due to its thermogenic properties. However, there has been a rise in popularity of "non-stimulant" or caffeine-free fat loss supplements in an attempt to circumvent caffeine-induced central nervous system stimulation while still stimulating an increase in resting e...
Preprint
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Adiposity is associated with adverse health conditions such as obesity, cardiovascular disease and type 2 diabetes. The combination of resistance exercise and creatine supplementation has been shown to decrease body fat % in adults ≥ 50 years of age. However, the effects in adults < 50 years of age is unknown. To address this limitation, we systema...
Article
Full-text available
Bodybuilding is a sport where coaches commonly recommend a variety of nutrition and exercise protocols, supplements, and, sometimes, performance-enhancing drugs (PEDs). The present study sought to gain an understanding of the common decisions and rationales employed by bodybuilding coaches. Focusing on coaches of the more muscular divisions in the...
Article
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Based on a comprehensive review and critical analysis of the literature regarding the nutritional concerns of female athletes, conducted by experts in the field and selected members of the International Society of Sports Nutrition (ISSN), the following conclusions represent the official Position of the Society: 1. Female athletes have unique and un...
Article
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Position Statement: The International Society of Sports Nutrition (ISSN) bases the following position stand on a critical analysis of the literature regarding the effects of energy drink (ED) or energy shot (ES) consumption on acute exercise performance, metabolism, and cognition, along with synergistic exercise-related performance outcomes and tra...
Article
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The purpose of this study was to examine the effects of intermittent versus continuous energy restriction on body composition, resting metabolic rate, and eating behaviors in resistance-trained females. Thirty-eight resistance-trained females (mean ± standard deviation age: 22.3±4.2 years) were randomized to receive either six weeks of a continuous...
Article
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This position stand aims to provide an evidence-based summary of the energy and nutritional demands of tactical athletes to promote optimal health and performance while keeping in mind the unique challenges faced due to work schedules, job demands, and austere environments. After a critical analysis of the literature, the following nutritional guid...
Article
Lewis, MH, Siedler, MR, Lamadrid, P, Ford, S, Smith, T, SanFilippo, G, Waddell, B, Trexler, ET, Buckner, S, and Campbell, BI. Sex differences may exist for performance fatigue but not recovery after single-joint upper-body and lower-body resistance exercise. J Strength Cond Res XX(X): 000-000, 2022-This study evaluated sex differences in performanc...
Article
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Practical blood flow restriction (PBFR) training has been used as a training technique to induce muscular strength and hypertrophy gains while utilizing lighter loads [≤ 40% one repetition maximum (1RM)]. It is unclear if PBFR can be incorporated into traditional training programs to alleviate some exposure to heavy loads. Objective: Compare the im...
Article
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Based on a comprehensive review and critical analysis of the literature regarding the effects of sodium bicarbonate supplementation on exercise performance, conducted by experts in the field and selected members of the International Society of Sports Nutrition (ISSN), the following conclusions represent the official Position of the Society: 1. Sup...
Article
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Abstract Background The purpose of this study was to compare a flexible vs. rigid diet on weight loss and subsequent weight regain in resistance-trained (RT) participants in a randomized, parallel group design. Methods Twenty-three males and females (25.6 ± 6.1 yrs; 170 ± 8.1 cm; 75.4 ± 10.3 kg) completed the 20-week intervention (consisting of a 1...
Article
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Following critical evaluation of the available literature to date, The International Society of Sports Nutrition (ISSN) position regarding caffeine intake is as follows: 1. Supplementation with caffeine has been shown to acutely enhance various aspects of exercise performance in many but not all studies. Small to moderate benefits of caffeine use...
Article
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The microorganisms in the gastrointestinal tract play a significant role in nutrient uptake, vitamin synthesis, energy harvest, inflammatory modulation, and host immune response, collectively contributing to human health. Important factors such as age, birth method, antibiotic use, and diet have been established as formative factors that shape the...
Article
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The purpose of this case-series was to evaluate the physiological, psychological and performance-related changes that occur during the postcompetition period. Participants included three male (34.3 ± 6.8 years, 181.6 ± 8.9 cm) and four female (29.3 ± 4.9 years, 161.4 ± 6.0 cm) natural physique athletes. Body composition (fat mass (FM) and fat-free...
Article
Full-text available
There is a lack of research into how lean, resistance trained (RT) individuals respond to intermittent energy restricted diets. Therefore, we investigated body composition changes in RT-individuals during continuous energy restriction or intermittent restriction. A total of 27 males and females (25 ± 6.1 years; 169 ± 9.4 cm; 80 ± 15.6 kg) were rand...
Article
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Vitamin D and calcium supplementation have been posited to improve body composition and different formulations of calcium may impact bioavailability. However, data are lacking regarding the combinatorial effects of exercise, diet, and calcium and/or vitamin D supplementation on body composition changes in post-menopausal women. Herein, 128 post-men...
Article
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Physique competitors focus on optimizing body composition through maximizing muscle mass and loss of body fat. Competitors frequently experiment with various methodologies purported to improve body composition, but often, there is a lack of evidence on their efficacy. Emerging evidence suggests that intermittent energy restriction (IER) methodologi...
Article
Full-text available
Position statement: The International Society of Sports Nutrition (ISSN) provides an objective and critical review of the mechanisms and use of probiotic supplementation to optimize the health, performance, and recovery of athletes. Based on the current available literature, the conclusions of the ISSN are as follows: Probiotics are live microorgan...
Article
Full-text available
In this Position Statement, the International Society of Sports Nutrition (ISSN) provides an objective and critical review of the literature pertinent to nutritional considerations for training and racing in single-stage ultra-marathon. Recommendations for Training. i) Ultra-marathon runners should aim to meet the caloric demands of training by fol...
Conference Paper
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Effects of MusclePharm Assault BlackTM on lower extremity spinal excitability and postactivation potentiation: A pilot study Brian Wallace*, Haley Bergstrom, Kelly Wallace Department of Kinesiology and Health Promotion, University of Kentucky, Lexington, KY 40506, USA Email: brian.wallace@uky.edu; brian.wallace@northern.edu Background: Caffeine h...

Citations

... Specifically, within volleyball, the primary supplements investigated among this population are caffeine, 28 creatine, 29 and β hydroxy β methylbutyrate (HMB). 30 Caffeine, a widely consumed psychoactive substance, 31 has long dominated sports supplement research. 31 Its efficacy in enhancing vertical jump height among soccer, 32 basketball, 33 has been well-established. ...
... (Wolinsky and Driskell, 2004) Ergojenik ajan olarak kreatin kaslarda daha fazla kreatin fosfatın depolanmasını ve anında enerji üretimi için kapasiteyi artırmaya yarar (Kreider et al., 1998). Kreatinin günümüzde vücut geliştirmecilerde en yaygın kullanılan ergojenik yardımcılarda birinci sırada olduğu söylenebilir (Rukstela et al., 2023). Kreatin uzun zamandır bilinen ve oldukça popüler bir supplement olmasına rağmen bu bölümde ele alınmasının sebebi son dönemde ki farklı bakış açılarını kanıtlarıyla ortaya koymaktır. ...
... At low altitude, sex differences, including the influence of sex hormones on carbohydrate and lipid metabolism, are associated with distinct body fat distribution and energy substrate utilization patterns in women and men. Women store more lipids and have higher whole-body insulin sensitivity than men, and women tend to oxidize more lipids than men (Sims et al., 2023;Varlamov et al., 2014). Furthermore, women's resting metabolism and energy intake may vary across the menstrual cycle (Benton et al., 2020;Rogan and Black, 2023;Sims et al., 2023;Wohlgemuth et al., 2021). ...
... Isso se deve ao aumento no recrutamento das fibras musculares de contração rápida nesse tipo de atividade, que são especializadas no metabolismo glicolítico, e ao aumento dos níveis de epinefrina no sangue, que eleva a taxa de quebra do glicogênio muscular aumentando a disponibilidade de substrato para a glicólise e a produção de lactato. (Powers & Howley, 2017 (Jagim et al., 2023). ...
... The potentially RMRsparing effects of exercise-based deficits in overweight, obese, and untrained populations should be considered, though these may not carry over to lean, trained populations. Finally, the utility of intermittent periods of increased EB as a means of attenuating decreases in RMR during a longerterm weight loss intervention deserves further research in both overweight and obese [169][170][171] and trained populations [172][173][174]. ...
... This ubiquity has inspired over a century of sports and exercise research focused on quantifying the rate of metabolic energy expenditure (Ṁ) during running (1)(2)(3)(4)(5)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(20)(21)(22)(23)23,24,(24)(25)(26)26,27,(27)(28)(29)(30)32,(35)(36)(37)(38)(39)(41)(42)(43)(44)(45)47,(49)(50)(51)56,58,60,(65)(66)(67)73,74,76,77,79,80). Precise Ṁ estimates are needed to optimize distance running performance (48) and nutritional interventions (33). Furthermore, safety recommendations for operating in extreme environments are contingent on the validity of these estimates, given the potential severity of hot and cold injuries (63,64). ...
... INTRODUCTION also reports that do not confirm this positive influence of NaH-CO 3 [22,23]. This may be due to the large diversity of the organism's individual response to this agent and supplementation protocols [20,24], or related to digestive system problems that can appear in some people [18,25]. Due to lower tolerance, some athletes choose lower doses (~0.2 g · kg −1 BM ) and lengthening the time between NaHCO 3 intake and exercise starting (~180 min), which may also have an ergogenic benefit [16,20,26]. ...
... Moreover, the increase in dietary restraint associated with weight loss in response to physical activity may be influenced by a greater increase in flexible dietary restraint compared to rigid dietary restraint as demonstrated in this study. In contrast, Conlin et al. concluded that both flexible and rigid restraint can be effective for weight loss in response to resistance exercise training [25]. Westenhoefer et al. reported that flexible restraint was associated with greater weight loss and rigid restraint was associated with less weight loss in response to 6 months of a commercial weight loss program [26]. ...
... Coffee and tea are common beverages for contemporary o ce workers. After intense work, such beverages may improve the subjective concentration of the human body, thereby improving work e ciency [11]. Different beverage intake habits affect the body's excitement level, which is closely related to sleep. ...
... But, antibiotics, anthelmintic use, stress, smoking, age, type of birth, pathophysiological conditions, and genetics can also drive microbial composition and function (Diener et al., 2022). Likewise, compelling evidence shows that exercise alters the function and structure of the gut ecosystem (Scheiman et al., 2019;Mohr et al., 2020;Barton et al., 2021;Morita et al., 2023). Endurance exercise has been studied as a significant long-term modifier of the intestinal microbiome composition and function in animal and human studies (Clarke et al., 2014;Barton et al., 2018;Scheiman et al., 2019;Plancade et al., 2019;Mach et al., 2021;Mach et al., 2022). ...