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Journal of the International Society of Sports Nutrition

https://read.qxmd.com/read/38860870/differences-in-perceived-energy-and-macronutrient-requirements-across-divisions-in-ncaa-athletes
#1
JOURNAL ARTICLE
K Michelle Singleton, Andrew R Jagim, Jamie McAllister-Deitrick, Marcos Daou, Chad M Kerksick
BACKGROUND: Sports nutrition is an impactful component to sports performance. The purpose of the current study was to investigate the sports nutrition knowledge of National Collegiate Athletic Association collegiate athletes and assess self-reported perceived requirements for energy and macronutrient intake. A secondary aim was to evaluate the awareness of physical and emotional perceptions associated with mindful eating. METHODS: Participants included NCAA Division I (DI, n  = 45), II (DII, n  = 31), and III (DIII, n  = 47) athletes...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38836626/effect-of-caffeine-ingestion-on-time-trial-performance-in-cyclists-a-systematic-review-and-meta-analysis
#2
REVIEW
Bin Chen, Li Ding, Qiyang Qin, Tze-Huan Lei, Olivier Girard, Yinhang Cao
BACKGROUND: Caffeine, widely recognized as an ergogenic aid, has undergone extensive research, demonstrating its effectiveness to enhance endurance performance. However, there remains a significant gap in systematically evaluating its effects on time trial (TT) performance in cyclists. PURPOSE: This meta-analysis aimed to determine the efficacy of caffeine ingestion to increase cycling TT performance in cyclists and to evaluate the optimal dosage range for maximum effect...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38775452/association-of-low-muscle-mass-index-and-sarcopenic-obesity-with-knee-osteoarthritis-a-systematic-review-and-meta-analysis
#3
REVIEW
Qiming Wu, Zhuyan Xu, Xiaomin Ma, Juan Li, Jun Du, Jing Ji, Xiaomeng Ling, Juntao Kan, Min Zhao
BACKGROUND: Sarcopenia and knee osteoarthritis are common age-related diseases that have become important public health issues worldwide. Few studies have reported the association between muscle mass loss and knee osteoarthritis. This may be due to the high level of heterogeneity between studies stemming from different definitions of muscle mass loss. METHODS: The systematic searches were carried out in PubMed and Web of Science from the inception of the databases until 13 January 2023, by two independent researchers...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38725238/paraxanthine-provides-greater-improvement-in-cognitive-function-than-caffeine-after-performing-a-10-km-run
#4
RANDOMIZED CONTROLLED TRIAL
Choongsung Yoo, Dante Xing, Drew E Gonzalez, Victoria Jenkins, Kay Nottingham, Broderick Dickerson, Megan Leonard, Joungbo Ko, Megan H Lewis, Mark Faries, Wesley Kephart, Martin Purpura, Ralf Jäger, Shawn D Wells, Kylin Liao, Ryan Sowinski, Christopher J Rasmussen, Richard B Kreider
RATIONALE: Intense exercise promotes fatigue and can impair cognitive function, particularly toward the end of competition when decision-making is often critical for success. For this reason, athletes often ingest caffeinated energy drinks prior to or during exercise to help them maintain focus, reaction time, and cognitive function during competition. However, caffeine habituation and genetic sensitivity to caffeine (CA) limit efficacy. Paraxanthine (PX) is a metabolite of caffeine reported to possess nootropic properties...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38708971/energy-intake-hydration-status-and-sleep-of-world-class-male-archers-during-competition
#5
JOURNAL ARTICLE
Ozcan Esen, Ian Walshe, Stuart Goodall
BACKGROUND: Nutritional intake and sleep, play an important role for recovery and performance in elite sport but little work has been undertaken in archery. The present study aimed to assess energy intake (EI), hydration status, and sleep parameters in world-class male archers over the course of a four-day competition. METHODS: Results, Conclusions Six male, elite-standard archers participated in the study and measurements of hydration status, EI, competition load, and sleep were recorded throughout each day of competition...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38676933/effects-of-pre-exercise-glycerol-supplementation-on-dehydration-metabolic-kinematic-and-thermographic-variables-in-international-race-walkers
#6
RANDOMIZED CONTROLLED TRIAL
Francisco Javier Martínez-Noguera, Alessio Cabizosu, Pedro E Alcaraz, Cristian Marín-Pagán
BACKGROUND: Due to the increase in global temperature, it is necessary to investigate solutions so that athletes competing in hot conditions can perform in optimal conditions avoiding loss of performance and health problems. Therefore, this study aims to evaluate the effect of pre-exercise glycerol supplementation during a rectangular test at ambient temperature mid (28.2ºC) on dehydration variables in international race walkers. METHODS: Eight international male race walkers (age: 28...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38626029/common-questions-and-misconceptions-about-protein-supplementation-what-does-the-scientific-evidence-really-show
#7
REVIEW
Jose Antonio, Cassandra Evans, Arny A Ferrando, Jeffrey R Stout, Brandi Antonio, Harry Cinteo, Patrick Harty, Shawn M Arent, Darren G Candow, Scott C Forbes, Chad M Kerksick, Flavia Pereira, Drew Gonzalez, Richard B Kreider
Protein supplementation often refers to increasing the intake of this particular macronutrient through dietary supplements in the form of powders, ready-to-drink shakes, and bars. The primary purpose of protein supplementation is to augment dietary protein intake, aiding individuals in meeting their protein requirements, especially when it may be challenging to do so through regular food (i.e. chicken, beef, fish, pork, etc.) sources alone. A large body of evidence shows that protein has an important role in exercising and sedentary individuals...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38606895/high-dose-short-term-creatine-supplementation-without-beneficial-effects-in-professional-cyclists-a-randomized-controlled-trial
#8
RANDOMIZED CONTROLLED TRIAL
David Barranco-Gil, Lidia B Alejo, Carlos Revuelta, Miguel Górriz, Itziar Pagola, Laureano M Ozcoidi, Alejandro Lucia, Pedro L Valenzuela
BACKGROUND: Growing evidence supports the ergogenic effects of creatine supplementation on muscle power/strength, but its effects on endurance performance remain unclear. We assessed the effects of high-dose short-term creatine supplementation in professional cyclists during a training camp. METHODS: The study followed a double-blind, randomized parallel design. Twenty-three professional U23 cyclists (19 ± 1 years, maximum oxygen uptake: 73...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38576169/oral-post-exercise-garlic-extract-supplementation-enhances-glycogen-replenishment-but-does-not-up-regulate-mitochondria-biogenesis-mrna-expression-in-human-exercised-skeletal-muscle
#9
RANDOMIZED CONTROLLED TRIAL
I-Shiung Cheng, Jung-Piao Tsao, Jeffrey R Bernard, Tsen-Wei Tsai, Chia-Chen Chang, Su-Fen Liao
PURPOSE: Garlic extract (GA) is purported to enhance antioxidant and anti-inflammatory activity and glucose regulation in humans. The present study investigated the effects of post-exercise GA supplementation on GLUT4 expression, glycogen replenishment, and the transcript factors involved with mitochondrial biosynthesis in exercised human skeletal muscle. METHODS: The single-blinded crossover counterbalanced study was completed by 12 participants. Participants were randomly divided into either GA (2000 mg of GA) or placebo trials immediately after completing a single bout of cycling exercise at 75% Maximal oxygen uptake (VO2max ) for 60 minutes...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38572744/influence-of-short-term-chronic-oral-cannabidiol-application-on-muscle-recovery-and-performance-after-an-intensive-training-protocol-a-randomized-double-blind-crossover-study
#10
JOURNAL ARTICLE
Eduard Isenmann, Sebastian Veit, Ulrich Flenker, Alessio Lesch, Dirk W Lachenmeier, Patrick Diel
BACKGROUND: Rapid regeneration after intense exercise is essential for competitive athletes. Based on this assumption, supplementation strategies, focusing on food supplements, are increasing to improve the recovery processes. One such supplement is cannabidiol (CBD) which is gaining more attention in competitive sports. However, the evidence is still lacking and there are no data available about the effect of a short-term chronic application. METHODS: A three-arm double-blind cross-over study was conducted to determine the effects of two different CBD products on performance, muscle damage and inflammatory processes in well-trained athletes...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38535518/acute-effects-of-various-doses-of-nitrate-rich-beetroot-juice-on-high-intensity-interval-exercise-responses-in-women-a-randomized-double-blinded-placebo-controlled-crossover-trial
#11
RANDOMIZED CONTROLLED TRIAL
Zhang Jiaqi, Dai Zihan, Stephen Heung-Sang Wong, Zheng Chen, Eric Tsz-Chun Poon
BACKGROUND: This study investigated the acute effects of various doses of nitrate-rich beetroot juice on the responses to high-intensity interval exercise in women. METHODS: A double-blinded, randomized, placebo-controlled, crossover trial was conducted with 13 recreationally active young women (age = 23 ± 2 years). All participants performed interval exercise (8 × 1-min bouts of cycling at 85% of peak power output [PPO] interspersed with 1-min active recovery at 20% of PPO) 2...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38466174/common-questions-and-misconceptions-about-caffeine-supplementation-what-does-the-scientific-evidence-really-show
#12
REVIEW
Jose Antonio, Daniel E Newmire, Jeffrey R Stout, Brandi Antonio, Maureen Gibbons, Lonnie M Lowery, Joseph Harper, Darryn Willoughby, Cassandra Evans, Dawn Anderson, Erica Goldstein, Jose Rojas, Matías Monsalves-Álvarez, Scott C Forbes, Jose Gomez Lopez, Tim Ziegenfuss, Blake D Moulding, Darren Candow, Michael Sagner, Shawn M Arent
Caffeine is a popular ergogenic aid that has a plethora of evidence highlighting its positive effects. A Google Scholar search using the keywords "caffeine" and "exercise" yields over 200,000 results, emphasizing the extensive research on this topic. However, despite the vast amount of available data, it is intriguing that uncertainties persist regarding the effectiveness and safety of caffeine. These include but are not limited to: 1. Does caffeine dehydrate you at rest? 2. Does caffeine dehydrate you during exercise? 3...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38285913/the-effect-of-the-ketogenic-diet-on-resistance-training-load-management-a-repeated-measures-clinical-trial-in-trained-participants
#13
JOURNAL ARTICLE
Salvador Vargas-Molina, Manuel García-Sillero, Diego A Bonilla, Jorge L Petro, Jerónimo García-Romero, Javier Benítez-Porres
BACKGROUND: The effect of low-carbohydrate high-fat dietary manipulation, such as the ketogenic diet (KD), on muscle strength assessment in resistance-training (RT) participants has focused on the one-repetition maximum test (1-RM). However, a pre-specified 1-RM value during an exercise training program disregards several confounding factors (i.e. sleep, diet, and training-induced fatigue) that affect the exerciser's "true" load and daily preparedness. We aimed to evaluate the effect of a 6-week RT program on load control-related variables in trained subjects following a KD intervention...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38265726/the-applicability-of-a-commercial-3do-body-scanner-in-measuring-body-composition-in-chinese-adults-with-overweight-and-obesity-a-secondary-analysis-based-on-a-weight-loss-clinical-trial
#14
JOURNAL ARTICLE
Jialu Wang, Anqi Song, Molian Tang, Yi Xiang, Yiquan Zhou, Zhiqi Chen, David Heber, Qingya Tang, Renying Xu
BACKGROUND: A commercial three-dimensional optical (3DO) scanning system was reported to be used in body composition assessment. However, the applicability in Chinese adults has yet to be well-studied. METHODS: This secondary analysis was based on a 16-week weight-loss clinical trial with an optional extension to 24 weeks. Waist and hip circumference and body composition were measured by 3DO scanning at each follow-up visit during the study. Bioelectrical impedance analysis (BIA) was also performed to confirm the reliability of 3DO scanning at each visit...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38239059/muscle-contraction-time-after-caffeine-intake-is-faster-after-30-minutes-than-after-60-minutes
#15
JOURNAL ARTICLE
Paweł Pakosz, Mariusz Konieczny, Przemysław Domaszewski, Tomasz Dybek, Oscar García-García, Mariusz Gnoiński, Elżbieta Skorupska
BACKGROUND: This study aimed to determine the optimal time point, either 30 or 60 minutes, at which muscle reactivity to caffeine administration is highest. Unlike previous studies that focused on the nervous system response, we employed tensiomyography (TMG) to directly assess the effects of caffeine on muscle fibers. METHODS: TMG measurements were performed on the gastrocnemius medialis muscle of 42 male athletes who regularly consumed caffeine. Participants received a dose of 6 mg/kg body weight and TMG measurements were taken prior to caffeine intake, as well as 30 and 60 minutes afterward...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38226646/the-dose-dependent-effect-of-caffeine-supplementation-on-performance-reaction-time-and-postural-stability-in-crossfit-a-randomized-placebo-controlled-crossover-trial
#16
RANDOMIZED CONTROLLED TRIAL
Natalia Główka, Jakub Malik, Tomasz Podgórski, Rafał Stemplewski, Janusz Maciaszek, Julia Ciążyńska, Emilia E Zawieja, Agata Chmurzynska, Paulina M Nowaczyk, Krzysztof Durkalec-Michalski
BACKGROUND: Caffeine (CAF) ingestion improves performance in a broad range of exercise tasks. Nevertheless, the CAF-induced, dose-dependent effect on discipline-specific performance and cognitive functions in CrossFit/High-Intensity Functional Training (HIFT) has not been sufficiently investigated. The aim of this study was to evaluate the effect of acute supplementation of three different doses of CAF and placebo (PLA) on specific performance, reaction time (RTime ), postural stability (PStab ), heart rate (HR) and perceived exertion (RPE)...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38226601/collegiate-women-s-wrestling-body-fat-percentage-and-minimum-wrestling-weight-values-time-for-revisiting-minimal-body-fat-percent
#17
JOURNAL ARTICLE
Andrew R Jagim, Grant M Tinsley, Robert A Oppliger, Craig A Horswill, Ward C Dobbs, Jennifer B Fields, Cliff Cushard, Paul D Rademacher, Margaret T Jones
BACKGROUND: The estimation of body fat percentage (BF%) in wrestling is used to determine the minimum wrestling weight (MWW) and lowest allowable weight class (MWC) in which wrestlers are eligible to compete. A 12% minimum threshold is currently used for women wrestlers, yet a potential increase for safety has been discussed. Because of the novelty of collegiate women's wrestling, there is a paucity of literature available on the body composition norms of this population. The purpose of this study was to provide a descriptive summary of BF% and MWW values of female wrestlers and how MWW values would change with the use of different BF% thresholds...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38213003/the-effects-of-nicotine-withdrawal-on-exercise-related-physical-ability-and-sports-performance-in-nicotine-addicts-a-systematic-review-and-meta-analysis
#18
JOURNAL ARTICLE
Kangzhe Bao, Kai Zheng, Xianxian Zhou, Baichao Chen, Zerui He, Danyang Zhu
BACKGROUND: Previous research has established that nicotine withdrawal can ameliorate cardiovascular and pulmonary function in smokers. Nevertheless, the impact on physical fitness and athletic performance remains under-investigated. OBJECTIVE: To evaluating the impacts of nicotine withdrawal on both exercise performance and exercise-associated physical capabilities in nicotine-dependent individuals. STUDY DESIGN: A comprehensive systematic review and meta-analysis...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38198469/the-dose-response-effects-of-flurbiprofen-indomethacin-ibuprofen-and-naproxen-on-primary-skeletal-muscle-cells
#19
JOURNAL ARTICLE
Brandon M Roberts, Alyssa V Geddis, Ronald W Matheny
BACKGROUND: Non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen, flurbiprofen, naproxen sodium, and indomethacin are commonly employed for their pain-relieving and inflammation-reducing qualities. NSAIDs work by blocking COX-1 and/or COX-2, enzymes which play roles in inflammation, fever, and pain. The main difference among NSAIDs lies in their affinity to these enzymes, which in turn, influences prostaglandin secretion, and skeletal muscle growth and regeneration. The current study investigated the effects of NSAIDs on human skeletal muscle cells, focusing on myoblast proliferation, differentiation, and muscle protein synthesis signaling...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38197606/acute-effects-of-commercial-energy-drink-consumption-on-exercise-performance-and-cardiovascular-safety-a-randomized-double-blind-placebo-controlled-crossover-trial
#20
RANDOMIZED CONTROLLED TRIAL
Nile F Banks, Emily M Rogers, Nate J Helwig, Laura E Schwager, Justin P Alpers, Sydni L Schulte, Emma R Trachta, Christopher M Lockwood, Nathaniel D M Jenkins
The aim of this study was to examine the acute effects of a non-caloric energy drink (C4E) compared to a traditional sugar-containing energy drink (MED) and non-caloric placebo (PLA) on exercise performance and cardiovascular safety. Thirty healthy, physically active males (25 ± 4 y) completed three experimental visits under semi-fasted conditions (5-10 h) and in randomized order, during which they consumed C4E, MED, or PLA matched for volume, appearance, taste, and mouthfeel. One hour after drink consumption, participants completed a maximal, graded exercise test (GXT) with measurement of pulmonary gases, an isometric leg extension fatigue test (ISOFTG ), and had their cardiac electrical activity (ECG), leg blood flow (LBF), and blood pressure (BP) measured throughout the visit...
December 2024: Journal of the International Society of Sports Nutrition
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