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Prevalence of iron-deficient but non-anemic university athletes in Japan: an observational cohort study. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-11-29 Takahiro Nabeyama,Yosuke Suzuki,Hiroaki Saito,Kana Yamamoto,Michiko Sakane,Yoichiro Sasaki,Haruka Shindo,Morihito Takita,Masahiro Kami
BACKGROUND Iron deficiency (ID) and iron deficiency anemia (IDA) are long-standing health problems in athletes, affecting both performance and health. ID prevalence in young athletes remains high and a matter of concern. ID and IDA can lead to fatigue, reduced endurance, and decreased oxygen transport, potentially compromising athletic performance. We hypothesized that ID would still be a major health
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Different perspectives on women's health, nutrition and endurance exercise. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-11-29 Nisha Charkoudian,Jason K W Lee,Gabrielle E W Giersch,Loretta DiPietro,Nina Stachenfeld
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Supplementation with food-derived oligopeptides promotes lipid metabolism in young male cyclists: a randomized controlled crossover trial. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Aina Jin,Zhaobo Kan,Qiushi Tan,Jing Shao,Qi Han,Yashan Chang,Nan An,Muqing Yi
BACKGROUND Accumulation of body fat and dyslipidemia are associated with the development of obesity and cardiometabolic diseases. Moreover, the degree to which lipids can be metabolized has been cited as a determinant of cardiometabolic health and prolonged endurance capacity. In the backdrop of increasing obesity and cardiometabolic diseases, lipid metabolism and its modulation by physical activity
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Weight cutting in female UFC fighters. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Cassandra Evans,Charles Stull,Gabriel Sanders,Anthony Ricci,Duncan French,Jose Antonio,Corey A Peacock
BACKGROUND It is common practice for fight sport athletes to use a variety of weight manipulation strategies to compete in desired weight classes. Although numerous studies have highlighted rapid weight loss (RWL) strategies and the magnitude of weight loss, few have focused specifically on weight loss in female fighters. The purpose of this study was to provide descriptive information on professional
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Competitive season effects on polyunsaturated fatty acid content in erythrocyte membranes of female football players. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Nere Peña,Javier Amézaga,Gerard Marrugat,Alba Landaluce,Toscana Viar,Julen Arce,Jon Larruskain,Josean Lekue,Carla Ferreri,José María Ordovás,Itziar Tueros
BACKGROUND An optimal and correctly balanced metabolic status is essential to improve sports performance in athletes. Recent advances in omic tools, such as the lipid profile of the mature erythrocyte membranes (LPMEM), allow to have a comprehensive vision of the nutritional and metabolic status of these individuals to provide personalized recommendations for nutrients, specifically, the essential
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Body fat of competitive volleyball players: a systematic review with meta-analysis. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Piotr Matłosz,Bojan Makivic,Robert Csapo,Patria Hume,Benedikt Mitter,Alejandro Martínez-Rodríguez,Pascal Bauer
BACKGROUND Reference values of body fat for competitive volleyball players are lacking, making it difficult to interpret measurement results. This review systematically summarized published data on the relative body fat of volleyball players and calculated potential differences between sex, measurement method, and competitive level. METHODS The protocol followed the Preferred Reported Items for Systematic
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Collagen peptides supplementation improves function, pain, and physical and mental outcomes in active adults. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Shiloah A Kviatkovsky,Robert C Hickner,Hannah E Cabre,Stephanie D Small,Michael J Ormsbee
INTRODUCTION Chronic pain affects 19% of adults in the United States, with increasing prevalence in active and aging populations. Pain can limit physical activity and activities of daily living (ADLs), resulting in declined mental and social health. Nutritional interventions for pain currently target inflammation or joint health, but few influence both. Collagen, the most abundant protein in the human
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Effects of pre-sleep protein supplementation on plasma markers of muscle damage and inflammatory cytokines resulting from sprint interval training in trained swimmers. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Cairong Wu,Jie Deng,Chengli Gao
BACKGROUND Pre-sleep protein has been shown to improve muscle recovery overnight following exercise-induced muscle damage. Whether such an approach affects recovery from sprint interval training (SIT) has yet to be elucidated. This study examined the effects of protein supplementation every night before sleep on early (45 min post-SIT) and late (24 and 48 h after SIT) responses of creatine kinase (CK)
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Early absorption sources of caffeine can be a useful strategy for improving female table tennis players-specific performance. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-11-16 Sepideh Pirmohammadi,Mohammad Hemmatinafar,Javad Nemati,Babak Imanian,Mohammad Hassan Abdollahi
BACKGROUND The consumption of fast absorption sources containing caffeine, such as caffeinated gum and coffee mouth rinsing, has been considered a practical nutritional strategy among athletes. Therefore, this study aimed to determine the effect of early absorption sources containing caffeine on the performance of female table tennis players. METHOD Eighteen female table tennis players randomly participated
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Effects of 16 weeks of two different high-protein diets with either resistance or concurrent training on body composition, muscular strength and performance, and markers of liver and kidney function in resistance-trained males. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Reza Bagheri,Mehdi Kargarfard,Ramin Sadeghi,David Scott,Donny M Camera
PURPOSE It is unclear whether resistance (RT) and concurrent training (CT; resistance plus endurance training) combined with different protein intakes have differential effects on muscle hypertrophy, strength, and performance. Therefore, we compared the effects of two high-protein diets (1.6 or 3.2 g.kg-1.d-1) during 16 weeks of either CT or RT alone in resistance-trained males. METHODS Forty-eight
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International society of sports nutrition position stand: coffee and sports performance. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Lonnie M Lowery,Dawn E Anderson,Kelsey F Scanlon,Abigail Stack,Guillermo Escalante,Sara C Campbell,Chad M Kerksick,Michael T Nelson,Tim N Ziegenfuss,Trisha A VanDusseldorp,Douglas S Kalman,Bill I Campbell,Richard B Kreider,Jose Antonio
Based on review and critical analysis of the literature regarding the contents and physiological effects of coffee related to physical and cognitive 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) Coffee is a complex matrix of hundreds of compounds
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Effects of maslinic acid supplementation on exercise-induced inflammation and oxidative stress in water polo athletes: A randomized, double-blind, crossover, and placebo-controlled trial. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Takanaga Shirai,Kanae Myoenzono,Eiskue Kawai,Yuki Yamauchi,Keito Suzuki,Seiji Maeda,Hideki Takagi,Tohru Takemasa
BACKGROUND Olive fruit is rich in bioactive pentacyclic triterpenoids, primarily maslinic acid (MA). Previous studies have demonstrated that MA exhibits anti-inflammatory and anti-oxidative effects; however, it is unclear whether MA intake during training inhibits perceptual fatigue and muscle soreness in athletes. This study analyzed the effects of MA supplementation during athletic training on perceptual
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Pre-sleep feeding, sleep quality, and markers of recovery in division I NCAA female soccer players. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Casey E Greenwalt,Elisa Angeles,Matthew D Vukovich,Abbie E Smith-Ryan,Chris W Bach,Stacy T Sims,Tucker Zeleny,Kristen E Holmes,David M Presby,Katie J Schiltz,Marine Dupuit,Liliana I Renteria,Michael J Ormsbee
Pre-sleep nutrition habits in elite female athletes have yet to be evaluated. A retrospective analysis was performed with 14 NCAA Division I female soccer players who wore a WHOOP, Inc. band - a wearable device that quantifies recovery by measuring sleep, activity, and heart rate metrics through actigraphy and photoplethysmography, respectively - 24 h a day for an entire competitive season to measure
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Effects of dietary supplements on athletic performance in elite soccer players: a systematic review. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Rodrigo Abreu,Catarina B Oliveira,Júlio A Costa,João Brito,Vitor H Teixeira
Dietary supplements are widely used among athletes, and soccer players are no exception. Nevertheless, evidence supporting the use of dietary supplements aiming to enhance performance in soccer is somewhat contradictory, scarce, or even nonexistent. Thus, the present study aimed to systematically review and synthesize the effects of dietary supplements on athletic performance (e.g. distance covered
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Evaluation of the reliability and educational quality of YouTube™ videos on sport nutrition topics. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-11-12 Anna Kiss,Sándor Soós,Ágoston Temesi,Brigitta Unger-Plasek,Zoltán Lakner,Orsolya Tompa
BACKGROUND YouTube is one of the most widespread social media channels, which is of growing importance in science communication and health education. The validity of medical and health-related information available on YouTube cannot be assured, and videos often contain potentially misleading or inaccurate information. Communication on sport nutrition may have a profound effect on the change in nutrition
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Prevalence and adverse effects of sport-related nutritional supplements (sport drinks, bars, and gels) in the military before and during the COVID-19 pandemic: the US Military Dietary Supplement Use Study. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-11-10 Joseph J Knapik,Daniel W Trone,Ryan A Steelman,Emily K Farina,Harris R Lieberman
BACKGROUND Sport-related nutritional supplements (SRNS) include sport drinks, sport bars, and sport gels. This investigation examined temporal patterns in SRNS use and adverse effects (AEs) reported by a single cohort of United States active-duty service members (SMs) surveyed before and during the coronavirus disease 2019 (COVID-19) pandemic. METHODS A stratified random sample (n = 22,858) of SMs
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A randomized, double-blind, placebo-controlled, repeated-dose pilot study of the safety, tolerability, and preliminary effects of a cannabidiol (CBD)- and cannabigerol (CBG)-based beverage powder to support recovery from delayed onset muscle soreness (DOMS). J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-11-10 Erica N Peters,Helena Yardley,Amy Harrison,Graham M L Eglit,Jose Antonio,Cynthia Turcotte,Marcel O Bonn-Miller
BACKGROUND Cannabinoid-containing products are marketed to athletes as promoting recovery, in spite of a lack of data on their safety and effects. This randomized, double-blind, placebo-controlled, repeated-dose pilot study tested the safety, tolerability, and preliminary effects on recovery of a formulation containing cannabidiol (CBD; 35 mg), cannabigerol (CBG; 50 mg), beta caryophyllene (BCP; 25 mg)
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The effect of pre-exercise protein intake on substrate metabolism, energy expenditure, and energy intake: a dose-response study. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-10-27 Wouter Michiel Peeters,Lauren Elizabetha Cook,Oliver Page
BACKGROUND Pre-exercise protein consumption does not seem to influence substrate metabolism during exercise compared to fasted exercise, however it is unclear if the protein dose impacts on this effect. METHODS In a randomized, double-blinded within-subject design trial, healthy, active males and females (n = 15, 25 ± 5 yrs, O2peak: 47.5 ± 8.8 ml/kg/min) completed 1 h of cycling exercise at 60% peak
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Effect of single or combined caffeine and L-Theanine supplementation on shooting and cognitive performance in elite curling athletes: a double-blind, placebo-controlled study. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-10-10 Umut Yilmaz,Yusuf Buzdagli,Muhammed Lütfü Polat,Yusuf Bakir,Burak Ozhanci,Sena Alkazan,Halil Ucar
PURPOSE Previous studies have investigated the effect of single or combined caffeine (CAF) and L-theanine (THE) intake on attention performance. However, its effect on shooting performance and cognitive performance in a sport is unknown. The aim of this study was to investigate the hypothesis "Does single or combined CAF and THE supplementation have an effect on shooting and cognitive performance in
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International Society of Sports Nutrition Position Stand: Effects of essential amino acid supplementation on exercise and performance. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-10-06 Arny A Ferrando,Robert R Wolfe,Katie R Hirsch,David D Church,Shiloah A Kviatkovsky,Michael D Roberts,Jeffrey R Stout,Drew E Gonzalez,Ryan J Sowinski,Richard B Kreider,Chad M Kerksick,Nicholas A Burd,Stefan M Pasiakos,Michael J Ormsbee,Shawn M Arent,Paul J Arciero,Bill I Campbell,Trisha A VanDusseldorp,Ralf Jager,Darryn S Willoughby,Douglas S Kalman,Jose Antonio
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, trainers, and other practitioners as to the benefits
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Skinfolds compressibility and digital caliper's time response in skinfold measurement in male and female young adults. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-10-04 Raquel Vaquero-Cristóbal,Ana Catarina-Moreira,Francisco Esparza-Ros,Carlos Barrigas,Mario Albaladejo-Saura,Filomena Vieira
BACKGROUND The skinfold caliper reading of the skinfold thickness depends on its dynamic compressibility. This has led to the fact that, while it is indicated that skinfold readings should be taken when the reading is stable, there is no consensus on at what second the reading should be taken after the application of the skinfold caliper. The new Lipowise PRO digital skinfold caliper was used to analyze
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The effect of a short-term ketogenic diet on exercise efficiency during graded exercise in healthy adults. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-10-04 Wonhee Cho,Hwaebong Jung,Sunghyun Hong,Hyuk In Yang,Dong-Hyuk Park,Sang-Hoon Suh,Dong Hoon Lee,Yong-Sahm Choe,Joon Young Kim,Wooyoung Lee,Justin Y Jeon
OBJECTIVE We examined the effects of short-term KD on exercise efficiency and hormonal response during and after the graded exercise testing. METHODS Fourteen untrained healthy adults (8 males, 6 females, age 26.4 ± 3.1 [SD] years; BMI 24.8 ± 4.6 kg/m2; peak VO2max 54.0 ± 5.8 ml/kg FFM/min) completed 3-days of a mixed diet (MD) followed by another 3-days of KD after 3-days of washout period. Upon completion
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The dose-response relationship of quercetin on the motor unit firing patterns and contractile properties of muscle in men and women. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-10-03 Kohei Watanabe,Shun Kunugi,Aleš Holobar
Quercetin is one type of ergogenic aid and its effects on the neuromuscular system have recently attracted interest, but its dose-effect is not yet fully understood. The aim of this study was to examine the effect of different doses of quercetin ingestion on motor unit firing patterns and muscle contractile properties in humans. Thirteen young males and females conducted neuromuscular performance tests
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Effect of vitamin D3 supplementation in winter on physical performance of university students: a one-month randomized controlled trial. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-09-21 Xiao-Li Zhang,Qing Zhang,Xu Zhang,Qin-Wen Gu,Jin-Jing Pan,Yu-Fang Pei,Jia-Fu Li,Fei Jiang,Ling-Jing Diao,Hui-Ming Zhou,Hong-Mei Ding,Zeng-Li Zhang,Guang-Ming Zhou,Wen-Jun Wang,Bing-Yan Li
BACKGROUND There is epidemiological evidence which suggests an association between 25-hydroxyvitamin D [25(OH)D] levels and bone and muscle function; however, it is unclear whether vitamin D supplementation has an added benefit beyond bone health. Here, we investigated the effects of vitamin D3 supplementation (1 month) on physical performance in Chinese university students in winter. METHODS One hundred
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Improved physical performance of elite soccer players based on GPS results after 4 days of carbohydrate loading followed by 3 days of low carbohydrate diet. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-09-20 Abdolreza Kazemi,Ghazi Racil,Amir Hossein Ahmadi Hekmatikar,Mohadeseh Behnam Moghadam,Parisa Karami,Menno Henselmans
BACKGROUND Carbohydrate loading is an established sports nutrition strategy for endur- 16 ance exercise performance. We tested if carbohydrate loading could improve the performance of 17 elite soccer players under ecologically valid circumstances using Global Positioning System (GPS) data. METHODS Twenty-two adult Iran Premier league soccer players were divided into a carbohydrate-loading group (CLG)
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Betaine supplementation improves CrossFit performance and increases testosterone levels, but has no influence on Wingate power: randomized crossover trial. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Emilia Zawieja,Krzysztof Durkalec-Michalski,Marcin Sadowski,Natalia Główka,Agata Chmurzynska
BACKGROUND Because betaine (BET) supplementation may improve muscular strength and endurance, it seems plausible that BET will also influence CrossFit performance (CF). PURPOSE The aim of this study was to evaluate the effects of three weeks of BET supplementation on body composition, CF performance, muscle power in the Wingate anaerobic test (WAnT), and the concentrations of selected hormones. The
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Nutritional intake and anthropometric characteristics are associated with endurance performance and markers of low energy availability in young female cross-country skiers. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Oona Kettunen,Ritva Mikkonen,Vesa Linnamo,Jaakko Mursu,Heikki Kyröläinen,Johanna K Ihalainen
BACKGROUND Low energy availability (LEA) can have negative performance consequences, but the relationships between LEA and performance are poorly understood especially in field conditions. In addition, little is known about the contribution of macronutrients to long-term performance. Therefore, the aim of this study was to evaluate if energy availability (EA) and macronutrient intake in a field-based
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Effects of fucoidan supplementation on inflammatory and immune response after high-intensity exercise. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Bridget A McFadden,Caroline S Vincenty,Alexa J Chandler,Harry P Cintineo,Blaine S Lints,Gianna F Mastrofini,Shawn M Arent
INTRODUCTION High-intensity exercise (HIE) can damage the musculotendon complex and impact the immune response, resulting in post-exercise inflammation. Sufficient rest and recovery will improve muscular resilience against future damaging bouts; however, HIE with minimal durations of rest is common in athletic competitions that facilitate persistent inflammation and immune dysregulation. Fucoidans
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Does whey protein supplementation during resistance exercise have additional benefits for decreasing hepatic fat content? J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Chae-Been Kim,Hyoung-Su Park,Hye-Jin Kim,Hong-Soo Kim,Jung-Jun Park
BACKGROUND Exercise and diet have positive effects on hepatic fat reduction, and protein supplementation is known to lower hepatic fat accumulation. However, the effect of a combination of exercise and whey protein supplementation (WPS) on hepatic fat content (HFC) is unknown. METHODS We investigated the effect of WPS on HFC during resistance exercise and diet control intervention for four weeks. A
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Effects of branched chain amino acids, l-citrulline, and alpha-glycerylphosphorylcholine supplementation on exercise performance in trained cyclists: a randomized crossover trial. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Renee Nicole Harrington
BACKGROUND Nutrition plays a key role in training and athletic performance and dietary supplements can make a small, but potentially valuable, contribution to achieving peak athletic performance. This study is the first to investigate the effects of supplementation from the combination of BCAAs, L-citrulline, and A-GPC on exercise performance. METHODS In this randomized, double-blind, crossover study
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Beneficial effects of oral and topical sodium bicarbonate during a battery of team sport-specific exercise tests in recreationally trained male athletes. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 William H Gurton,Jordanne Greally,Karolina Chudzikiewicz,Lewis A Gough,Anthony Lynn,Mayur K Ranchordas
OBJECTIVE This study examined the effects of oral and topical (PR Lotion; Momentous) sodium bicarbonate (NaHCO3) during a battery of team sport-specific exercise tests. METHOD In a block randomized, crossover, double-blind, placebo-controlled design, 14 recreationally trained male team sport athletes performed a familiarization visit and three experimental trials receiving: (i) 0.3 g·kg-1 body mass
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International society of sports nutrition position stand: nutritional concerns of the female athlete. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Stacy T Sims,Chad M Kerksick,Abbie E Smith-Ryan,Xanne A K Janse de Jonge,Katie R Hirsch,Shawn M Arent,Susan Joyce Hewlings,Susan M Kleiner,Erik Bustillo,Jaime L Tartar,Valerie G Starratt,Richard B Kreider,Casey Greenwalt,Liliana I Rentería,Michael J Ormsbee,Trisha A VanDusseldorp,Bill I Campbell,Douglas S Kalman,Jose Antonio
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 unpredictable hormone profiles, which influence their
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Repeated mouth rinsing of coffee improves the specific-endurance performance and jump performance of young male futsal players. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Ghasem Taheri Karami,Mohammad Hemmatinafar,Maryam Koushkie Jahromi,Javad Nemati,Alireza Niknam
BACKGROUND Mouth-rinsing with ergogenic solutions such as carbohydrate and caffeinated drinks has been considered among athletes as a practical nutritional strategy. Therefore, this study aimed to determine the effect of repeated coffee mouth-rinsing (CMR) doses on specific performances of futsal players. METHOD Twenty-four male futsal players randomly participated in this randomized, double-blind
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Garlic supplementation attenuates cycling exercise-induced oxidative inflammation but fails to improve time trial performance in healthy adults. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Jung-Piao Tsao,Jeffrey R Bernard,Tse-Hsin Tu,Hsiu-Chen Hsu,Chia-Chen Chang,Su-Fen Liao,I-Shiung Cheng
BACKGROUND Garlic extract has been shown to enhance antioxidant and anti-inflammation activities in humans. The present study investigated the effects of garlic supplementation on 40-km cycling time trial performance, exercise-induced oxidative stress, and inflammatory responses in healthy adults. METHODS Eleven healthy males were recruited to perform this single-blind crossover study. Participants
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Effects of a ready-to-drink thermogenic beverage on resting energy expenditure, hemodynamic function, and subjective outcomes. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Christian Rodriguez,Matthew T Stratton,Patrick S Harty,Madelin R Siedler,Jake R Boykin,Jacob J Green,Dale S Keith,Sarah J White,Brielle DeHaven,Alexandra Brojanac,Ethan Tinoco,Lem W Taylor,Grant M Tinsley
BACKGROUND Thermogenic supplements are often consumed by individuals seeking to improve energy levels and reduce body fat. These supplements are sold in powdered or ready-to-drink (RTD) forms and consist of a blend of ingredients such as caffeine, green tea extract, and other botanical compounds. While there is evidence that thermogenic supplements can positively affect resting energy expenditure (REE)
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Effects of citrulline on endurance performance in young healthy adults: a systematic review and meta-analysis. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Callum S Harnden,Joseph Agu,Tom Gascoyne
BACKGROUND Citrulline is a popular dietary supplement, primarily thought to exert ergogenic effects on exercise performance through the enhancement of nitric oxide (NO) synthesis and ammonia buffering. However, recent findings surrounding citrulline's effect on endurance performance have been inconsistent. A systematic review and meta-analysis of the relevant literature have yet to be undertaken. AIM
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Supplementation of caffeine and sodium bicarbonate together could not improve performance and performance-related factors in CrossFit participants: a randomized, double-blind, placebo-controlled study. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Amirhosein Ziyaiyan,Fatemeh Shabkhiz,Martin Hofmeister
BACKGROUND CrossFit includes weightlifting, powerlifting, and gymnastics in various combinations of overloads and repetitions with limited rest periods or no rest between training sets. Due to the novelty of CrossFit, there are few studies on the effect of nutritional strategies on the acute response to this type of sports activity. This study examined the effect of caffeine (CAF) and sodium bicarbonate
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Dietary collagen peptides alleviate exercise-induced muscle soreness in healthy middle-aged males: a randomized double-blinded crossover clinical trial. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Kumiko Kuwaba,Masashi Kusubata,Yuki Taga,Hiroshi Igarashi,Koichi Nakazato,Kazunori Mizuno
BACKGROUND Post-exercise muscle soreness and fatigue can negatively affect exercise performance. Thus, it is desirable to attenuate muscle soreness and fatigue and promote recovery even for daily exercise habits aimed at maintaining or improving health. METHODS This study investigated the effects of dietary collagen peptides (CPs) on post-exercise physical condition and fitness in healthy middle-aged
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Can the supplementation of vitamin D, sun exposure, and isolation during the COVID-19 pandemic affect the seasonal concentration of 25(OH)D and selected blood parameters among young soccer players in a one-year training season? J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Joanna Jastrzębska,Maria Skalska,Łukasz Radzimiński,Guillermo F López Sánchez,Lee Hill,Katja Weiss,Beat Knechtle
OBJECTIVE This study examined the effect of vitamin D supplementation, sunlight radiationradiation, and home isolation during the COVID-19 pandemic on the seasonal changes in 25(OH)D concentration and selected biomarkers in young soccer players along a one-year training cycle. METHOD Forty elite young soccer players (age: 17.2 ± 1.16 years, body mass: 70.2 ± 5.84, and body height: 179.1 ± 4.26 cm)
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The effects of L-Citrulline and Glutathione on Endurance performance in young adult trained males. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Hannah E Cabre,Casey E Greenwalt,Lacey M Gould,Abbie E Smith-Ryan
BACKGROUND Citrulline may amplify the effects of L-arginine and nitric oxide concentration, which may augment vasodilation and blood flow, thereby enhancing aerobic exercise performance. The purpose of this randomized, double-blind, placebo-controlled crossover study was to investigate effects of L-citrulline + Glutathione on aerobic exercise performance and blood flow in well-trained men. METHODS
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Defecation enhances cerebral perfusion and delays fatigue in elite triathletes. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Chen-Chan Wei,Giancarlo Condello,Ai-Lun Yang,Szu-Hsien Yu,Yi-Hung Liao,Chung-Yu Chen,Chi-Chieh Hsu,Chi-Yang Huang,Chia-Hua Kuo
BACKGROUND Rectal distension increases regulatory burden to autonomic nervous system in the brain. PURPOSE To determine the effect of rectal defecation on endurance performance and blood supply to the prefrontal brain and sub-navel regions of elite triathletes. METHODS Thirteen elite triathletes completed a cycling time trial (80% VO2max) under defecated and non-defecated conditions, using a counterbalanced
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Creatine supplementation and endurance performance: surges and sprints to win the race. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Scott C Forbes,Darren G Candow,Joao Henrique Falk Neto,Michael D Kennedy,Jennifer L Forbes,Marco Machado,Erik Bustillo,Jose Gomez-Lopez,Andres Zapata,Jose Antonio
Creatine supplementation is an effective ergogenic aid to augment resistance training and improve intense, short duration, intermittent performance. The effects on endurance performance are less known. The purpose of this brief narrative review is to discuss the potential mechanisms of how creatine can affect endurance performance, defined as large muscle mass activities that are cyclical in nature
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Effects of different phenylcapsaicin doses on resistance training performance, muscle damage, protein breakdown, metabolic response, ratings of perceived exertion, and recovery: a randomized, triple-blinded, placebo-controlled, crossover trial. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Pablo Jiménez-Martínez,Pedro Jesús Cornejo-Daza,Juan Sánchez-Valdepeñas,Iván Asín-Izquierdo,Clara Cano-Castillo,Carlos Alix-Fages,Fernando Pareja-Blanco,Juan C Colado
BACKGROUND The aim of this study was to explore the effects of a low dose (LD) of 0.625 mg and a high dose (HD) of 2.5 mg of phenylcapsaicin (PC) on full squat (SQ) performance, active muscle (RPE-AM) and overall body (RPE-OB) ratings of perceived exertion, muscle damage, protein breakdown, metabolic response, and 24-h recovery in comparison to placebo (PLA). METHOD Twenty-five resistance-trained males
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Creatine monohydrate supplementation changes total body water and DXA lean mass estimates in female collegiate dancers. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Samantha J Brooks,Darren G Candow,Annie J Roe,Bethaney D Fehrenkamp,Victoria C Wilk,Joshua P Bailey,Lukas Krumpl,Ann F Brown
Collegiate dance is unique because it requires athletic and academic performance; therefore, optimizing physical and mental function is crucial. Research among athletic populations demonstrate improvements in body composition, performance, and cognition following creatine monohydrate (CR) supplementation, yet dancers have not been investigated. The purpose of this study was to determine the effects
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International society of sports nutrition position stand: energy drinks and energy shots. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Andrew R Jagim,Patrick S Harty,Grant M Tinsley,Chad M Kerksick,Adam M Gonzalez,Richard B Kreider,Shawn M Arent,Ralf Jager,Abbie E Smith-Ryan,Jeffrey R Stout,Bill I Campbell,Trisha VanDusseldorp,Jose Antonio
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 training adaptations. The following 13 points constitute
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The effects of a thermogenic supplement on metabolic and hemodynamic variables and subjective mood states. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Jessica M Prather,Christine M Florez,Amie Vargas,Bella Soto,Abby Harrison,Darryn Willoughby,Grant Tinsley,Lem Taylor
BACKGROUND Thermogenic supplements are widely used in the general population to support attempted fat loss; however, the efficacy and safety of these supplements are questioned. PURPOSE To determine whether a thermogenic supplement affects metabolic rate, hemodynamic responses, and mood states. METHODS In a randomized double-blind crossover design, 23 females (22.2 ± 3.5 years; 164.8 ± 6.4 cm; 73.5
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The efficacy of a home-use metabolic device (Lumen) in response to a short-term low and high carbohydrate diet in healthy volunteers. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Justin Roberts,Dirk Dugdale-Duwell,Joseph Lillis,Jorge Marques Pinto,Ash Willmott,Shlomo Yeshurun,Merav Mor,Tjeu Souren
BACKGROUND Based on stoichiometric assumptions, and real-time assessment of expired carbon dioxide (%CO2) and flow rate, the Lumen device provides potential for consumers/athletes to monitor metabolic responses to dietary programs outside of laboratory conditions. However, there is a paucity of research exploring device efficacy. This study aimed to evaluate Lumen device response to: i) a high-carbohydrate
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Carbohydrate-Protein drink is effective for restoring endurance capacity in masters class athletes after a two-Hour recovery. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Erica R Goldstein,Jeffrey R Stout,Adam J Wells,Jose Antonio,Ecaterina Vasenina,David H Fukuda
BACKGROUND Carbohydrate (CHO) and carbohydrate-protein co-ingestion (CHO-P) have been shown to be equally effective for enhancing glycogen resynthesis and subsequent same-day performance when CHO intake is suboptimal (≤0.8 g/kg). Few studies have specifically examined the effect of isocaloric CHO vs CHO-P consumption on subsequent high-intensity aerobic performance with limited time to recover (≤2
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The effect of fish oil supplementation on resistance training-induced adaptations. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-12-01 Jeffery L Heileson,Steven B Machek,Dillon R Harris,Sara Tomek,Leticia C de Souza,Adam J Kieffer,Nicholas D Barringer,Andrew Gallucci,Jeffrey S Forsse,LesLee K Funderburk
BACKGROUND Resistance exercise training (RET) is a common and well-established method to induce hypertrophy and improvement in strength. Interestingly, fish oil supplementation (FOS) may augment RET-induced adaptations. However, few studies have been conducted on young, healthy adults. METHODS A randomized, placebo-controlled design was used to determine the effect of FOS, a concentrated source of
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The dose-response effects of arachidonic acid on primary human skeletal myoblasts and myotubes. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2023-01-03 Brandon M Roberts,Alexander L Kolb,Alyssa V Geddis,Marshall A Naimo,Ronald W Matheny
Background Cellular inflammatory response, mediated by arachidonic acid (AA) and cyclooxygenase, is a highly regulated process that leads to the repair of damaged tissue. Recent studies on murine C2C12 cells have demonstrated that AA supplementation leads to myotube hypertrophy. However, AA has not been tested on primary human muscle cells. Therefore, the purpose of this study was to determine whether
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Jogging and weight training associated with increased high-density lipoprotein cholesterol levels in Taiwanese adults. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2022-11-29 Chien-Chang Ho,Oswald Ndi Nfor,Yun-Tsung Chen,Chi-Fang Lin,Wen-Yu Lu,Min-Chen Wu,Chuan-Chao Lin,Yung-Po Liaw
Background Although previous studies have shown that aerobic and resistance exercise increase high-density lipoprotein cholesterol (HDL-C) levels, the optimal type of exercise has not been determined. Therefore, the purpose of this study was to investigate the association of jogging (a type of aerobic exercise) and weight training (a type of resistance exercise) with HDL-C levels in Taiwanese adults
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Athlete perceptions of flavored, menthol-enhanced energy gels ingested prior to endurance exercise in the heat. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2022-11-28 Roxanne M Vogel,Megan Lr Ross,Christian Swann,Jessica E Rothwell,Christopher J Stevens
Background L-menthol evokes a cooling sensation by activating cold sensing cation channels. Menthol-enhanced fluids can be ergogenic during exercise in the heat by improving thermal perception; hence, the addition of menthol to energy gels may benefit athletes. Previously, unflavored menthol gels were deemed acceptable at 0.1% concentration, but no research has been undertaken on menthol gels with
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Effects of a Multi-Ingredient Oral Supplement on Multiple Object Tracking, Reaction Time, and Reactive Agility. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2022-11-16 Justine M Renziehausen,Amy M Bergquist,Jeffrey R Stout,Adam J Wells,David H Fukuda
Background The demands of typical daily activities require a constant level of alertness and attention. Multi-ingredient, caffeine-containing supplements have been shown to improve measures of cognitive performance. As many of these supplements become readily available, efficacy of each should be evaluated. Therefore, the purpose of this study is to examine the effects of the 4D dietary supplement
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A nutritional intervention for moderate altitude endurance preparation: A case report. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2022-11-16 Juan J Guerrero-Pinzón,Juan M A Alcantara,Gustavo García-Buendia,Sol Mochón-Benguigui,Mauricio Ramírez-Maldonado,Jonatan R Ruiz,Lucas Jurado-Fasoli
Background Moderate altitudes carry physiological and metabolic changes that can dampen exercise performance. Fortunately, these changes can be modulated by an optimal nutritional intervention. This case study represents the first nutritional intervention of a moderate altitude athlete. These results may help to establish well-designed nutritional guidelines for moderate altitude sports athletes. Case
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Effects of carbohydrate and protein supplement strategies on endurance capacity and muscle damage of endurance runners: A double blind, controlled crossover trial. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2022-10-12 Yiheng Liang,Yan Chen,Fan Yang,Jørgen Jensen,Ruirui Gao,Longyan Yi,Junqiang Qiu
Background The purpose of this study is to explore the effect of carbohydrate only or carbohydrate plus protein supplementation on endurance capacity and muscle damage. Methods Ten recreationally active male runners (VO2max: 53.61 ± 3.86 ml/kg·min) completed run-to-exhaustion test three times with different intakes of intervention drinks. There was a 7-day wash-out period between tests. Each test started
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Prevalence of rapid weight loss in Olympic style wrestlers. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2022-10-11 Roberto Roklicer,Carlo Rossi,Antonino Bianco,Valdemar Stajer,Marijana Ranisavljev,Nikola Todorovic,Marko Manojlovic,Barbara Gilic,Tatjana Trivic,Patrik Drid
Background The methodology applied for rapid weight loss (RWL) among elite wrestlers is quite unexplored. Therefore, the aim of this study was to analyze the prevalence of sources of influence and methods used for RWL and to determine the differences between wrestling styles. Methods A total of 229 wrestlers who competed at the World Championship held in Belgrade, Serbia, participated in this research
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The exercise metabolome: acute aerobic and anaerobic signatures. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2022-10-11 Joseph K Pellegrino,Tracy G Anthony,Peter Gillies,Shawn M Arent
Background Exercise modality differentially alters body composition and physical performance. Metabolic changes underlying these outcomes can be tracked through assessment of circulating metabolites. Here, global responses to an acute bout of aerobic or anaerobic exercise were compared in the serum of male and female subjects using a discovery-based metabolomics platform. Methods On separate days,
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Omega-3 fatty acids enhance the beneficial effect of BCAA supplementation on muscle function following eccentric contractions. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2022-09-08 Yosuke Tsuchiya,Kenichi Yanagimoto,Norihiko Sunagawa,Hisashi Ueda,Katsunori Tsuji,Eisuke Ochi
Background This study investigated the combined effect of branched-chain amino acids (BCAA) and fish oil (FO) on muscle damage caused by eccentric contractions (ECCs) of the elbow flexors, with a special focus on muscular function. Methods Twenty-nine untrained male participants were enrolled in this double-blind, placebo-controlled, parallel study. The participants were randomly assigned to the placebo
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Effects of caffeine, methylliberine, and theacrine on vigilance, marksmanship, and hemodynamic responses in tactical personnel: a double-blind, randomized, placebo-controlled trial. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2022-08-18 Harry P Cintineo,Marissa L Bello,Alexa J Chandler,Thomas D Cardaci,Bridget A McFadden,Shawn M Arent
Background Tactical athletes require fast reaction times (RT) along with high levels of vigilance and marksmanship performance. Caffeine has been shown to improve these measures but also results in increased blood pressure and jitteriness. Research on other purine alkaloids, such as methylliberine and theacrine, has suggested they do not increase blood pressure or jitteriness to the same extent, but
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A randomized open-labeled study to examine the effects of creatine monohydrate and combined training on jump and scoring performance in young basketball players. J. Int. Soc. Sports Nutr. (IF 5.1) Pub Date : 2022-08-08 Salvador Vargas-Molina,Manuel García-Sillero,Richard B Kreider,Enrique Salinas,Jorge L Petro,Javier Benítez-Porres,Diego A Bonilla
Background Creatine monohydrate (CrM) supplementation has been shown to be an effective and safe nutritional supplement to improve performance; however, the impact of CrM supplementation in young basketball players is less clear. This study evaluated the effects of CrM supplementation during a strength and conditioning training (SCT) program on lower-limb strength parameters and performance in under-16