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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
#21
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
#22
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
#23
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
#24
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
#25
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
#26
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
#27
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
#28
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
#29
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
https://read.qxmd.com/read/38193521/supplementation-of-l-glutamine-enhanced-mucosal-immunity-and-improved-hormonal-status-of-combat-sport-athletes
#30
RANDOMIZED CONTROLLED TRIAL
Tung-Lin Lu, Ai-Chi Zheng, Katsuhiko Suzuki, Chi-Cheng Lu, Chung-Yuan Wang, Shih-Hua Fang
BACKGROUND: Maintaining proper immune function and hormone status is important for athletes to avoid upper respiratory tract infection (URTI) and insufficient recovery, which is detrimental to sport performance and health. The aim of this study was to evaluate whether three-week supplementation of L-glutamine could benefit the mucosal immunity and hormonal status of combat-sport athletes as well as their rates of upper respiratory tract infection (URTI) and subjective feelings of well-being after intensive training...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38151716/gut-microbiome-composition-link-between-sports-performance-and-protein-absorption
#31
JOURNAL ARTICLE
Péter Fritz, Réka Fritz, Pál Bóday, Ádám Bóday, Emese Bató, Péter Kesserű, Csilla Oláh
BACKGROUND: Sufficient protein intake is essential for adequate physical condition and athletic performance. However, numerous factors can influence the absorption of consumed protein, including timing, type of protein intake, and gut microbiota. In the present study, elite male water polo players consumed a plant-based, vegan protein supplement with ( n  = 10) or without ( n  = 10) pre- and probiotics daily during the 31-day study period. METHODS: We determined the anthropometric characteristics and body composition, dietary habits, gut microbiota composition, and blood parameters of the players at the beginning and at the end of the study...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38131124/the-effects-of-a-sugar-free-amino-acid-containing-electrolyte-beverage-on-5-kilometer-performance-blood-electrolytes-and-post-exercise-cramping-versus-a-conventional-carbohydrate-electrolyte-sports-beverage-and-water
#32
JOURNAL ARTICLE
Mason C McIntosh, Bradley A Ruple, Nicholas J Kontos, Madison L Mattingly, Christopher M Lockwood, Michael D Roberts
OBJECTIVE: The purpose of this study was to examine the acute effects of a multi-ingredient, low calorie dietary supplement (MIDS, XTEND® Healthy Hydration) on 5-kilometer (5-km) time trial performance and blood electrolyte concentrations compared to a carbohydrate-electrolyte beverage (CE, GATORADE® Thirst Quencher) and distilled water (W). METHODS: During visit 1 (V1), participants (10 men and 10 women, 20-35 years old, BMI ≤ 29 kg/m2 , recreationally active) reported to the laboratory whereby the following tests were performed: i) height and weight measurements, ii) body composition analysis, iii) treadmill testing to measure maximal aerobic capacity, and iv) 5-km time trial familiarization...
December 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38967605/proceedings-of-the-twenty-first-international-society-of-sports-nutrition-issn-conference-and-expo
#33
EDITORIAL
Chad M Kerksick, Guillermo Escalante, Bill Campbell, Douglas Kalman, Jose Antonio
No abstract text is available yet for this article.
July 2024: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38018828/prevalence-of-iron-deficient-but-non-anemic-university-athletes-in-japan-an-observational-cohort-study
#34
JOURNAL ARTICLE
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 concern in university athletes across sports clubs in Japan. PURPOSE: The study aimed to investigate the prevalence of ID and IDA in athletes participating in Kendo, badminton, baseball, and handball at the University of Tsukuba (Tsukuba, Ibaraki Prefecture, Japan)...
December 2023: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/38018805/different-perspectives-on-women-s-health-nutrition-and-endurance-exercise
#35
JOURNAL ARTICLE
Nisha Charkoudian, Jason K W Lee, Gabrielle E W Giersch, Loretta DiPietro, Nina Stachenfeld
No abstract text is available yet for this article.
December 2023: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/37974406/early-absorption-sources-of-caffeine-can-be-a-useful-strategy-for-improving-female-table-tennis-players-specific-performance
#36
RANDOMIZED CONTROLLED TRIAL
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 in this randomized, double-blind, and crossover designed study...
December 2023: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/37953602/evaluation-of-the-reliability-and-educational-quality-of-youtube%C3%A2-videos-on-sport-nutrition-topics
#37
JOURNAL ARTICLE
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 behavior among athletes, so evidence-based nutrition information must reach athletes...
December 2023: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/37947831/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
#38
JOURNAL ARTICLE
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 (Air Force, Army, Navy, and Marine Corps) who completed a questionnaire on their SRNS use and AE experiences and were still on active duty were asked to complete the identical questionnaire on a second occasion...
December 2023: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/37947792/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
#39
RANDOMIZED CONTROLLED TRIAL
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), branched-chain amino acids (BCAAs; 3.8 g), and magnesium citrate (420 mg)...
December 2023: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/37886841/the-effect-of-pre-exercise-protein-intake-on-substrate-metabolism-energy-expenditure-and-energy-intake-a-dose-response-study
#40
RANDOMIZED CONTROLLED TRIAL
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 power output 30 min after having consumed either 0, 20, or 40 g of whey protein...
December 2023: Journal of the International Society of Sports Nutrition
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