International Journal of Sport Nutrition and Exercise Metabolism This is an RSS file. You can use it to subscribe to this data in your favourite RSS reader or to display this data on your own website or blog.

Contaminants in Dietary Supplements: Toxicity, Doping Risk, and Current Regulation
Int J Sport Nutr Exerc Metab. 2024 Apr 23:1-10. doi: 10.1123/ijsnem.2023-0263. Online ahead of print.ABSTRACTAthletes, both amateur and professional, often resort to the consumption of nutritional supplements without professional supervision and without being aware of the risks they may entail. We conducted an exhaustive literature search to determine the most common substances found as contaminants in dietary supplements. For each substance, we analyzed its mechanism of action, clinical indication, health risk, and putative use as doping agent. In addition, we evaluated the current regulation of these supplements. Contami...
Source: International Journal of Sport Nutrition and Exercise Metabolism - April 23, 2024 Category: Sports Medicine Authors: Jes ús Zapata-Linares Guillermo Gervasini Source Type: research

Effect of Menstrual Cycle Phase and Hormonal Contraceptives on Resting Metabolic Rate and Body Composition
Int J Sport Nutr Exerc Metab. 2024 Apr 23:1-11. doi: 10.1123/ijsnem.2023-0193. Online ahead of print.ABSTRACTThe cyclical changes in sex hormones across the menstrual cycle (MC) are associated with various biological changes that may alter resting metabolic rate (RMR) and body composition estimates. Hormonal contraceptive (HC) use must also be considered given their impact on endogenous sex hormone concentrations and synchronous exogenous profiles. The purpose of this study was to determine if RMR and dual-energy X-ray absorptiometry body composition estimates change across the MC and differ compared with HC users. This wa...
Source: International Journal of Sport Nutrition and Exercise Metabolism - April 23, 2024 Category: Sports Medicine Authors: Megan A Kuikman Alannah K A McKay Clare Minahan Rachel Harris Kirsty J Elliott-Sale Trent Stellingwerff Ella S Smith Rachel McCormick Nicolin Tee Jessica Skinner Kathryn E Ackerman Louise M Burke Source Type: research

Omega-3 Status Evaluation in Australian Female Rugby League Athletes: Ad Libitum Fish Oil Provision Results in a Varied Omega-3 Index
This study investigated the impact of ad libitum fish oil supplementation on the omega-3 status of female athletes in a professional rugby league team during a competitive season. Twenty-four (n = 24) athletes participated, and their omega-3 status was assessed using the Omega-3 Index (O3I) and arachidonic acid (AA) to EPA ratio through finger-prick blood samples taken at the start and end of the season. They were given access to a fish oil supplement (PILLAR Performance, Australia) with a recommended daily dose of four capsules per day (2,160 mg EPA and 1,440 mg docosahexaenoic acid). At the beginning of the season, the g...
Source: International Journal of Sport Nutrition and Exercise Metabolism - April 22, 2024 Category: Sports Medicine Authors: Ryan Anthony Nicola Jaffrey Caitlin Byron Gregory E Peoples Michael J Macartney Source Type: research

Coingestion of Collagen With Whey Protein Prevents Postexercise Decline in Plasma Glycine Availability in Recreationally Active Men
Int J Sport Nutr Exerc Metab. 2024 Apr 10:1-10. doi: 10.1123/ijsnem.2023-0264. Online ahead of print.ABSTRACTWhey protein ingestion during recovery from exercise increases myofibrillar but not muscle connective protein synthesis rates. It has been speculated that whey protein does not provide sufficient glycine to maximize postexercise muscle connective protein synthesis rates. In the present study, we assessed the impact of coingesting different amounts of collagen with whey protein as a nutritional strategy to increase plasma glycine availability during recovery from exercise. In a randomized, double-blind, crossover des...
Source: International Journal of Sport Nutrition and Exercise Metabolism - April 11, 2024 Category: Sports Medicine Authors: Thorben Aussieker Tom A H Janssen Wesley J H Hermans Andrew M Holwerda Joan M Senden Janneau M X van Kranenburg Joy P B Goessens Tim Snijders Luc J C van Loon Source Type: research

Trehalose Improved 20-min Cycling Time-Trial Performance After 100-min Cycling in Amateur Cyclists
This study investigated the ergogenic and metabolic effects of CHO supplementation with distinct GIs, namely, (a) trehalose (30 g/hr), (b) isomaltulose (30 g/hr), (c) maltodextrin (60 g/hr), and (d) placebo (water). In this double-blind, crossover, counterbalanced, placebo-controlled study, 13 male cyclists cycled a total of 100 min at varied exercise intensity (i.e., 10-min stages at 1.5, 2.0, and 2.5 W/kg; repeated three times plus two 5-min stages at 1.0 W/kg before and after the protocol), followed by a 20-min time trial on four separated occasions. Blood glucose and lactate (every 20 min), heart rate, and ratings of p...
Source: International Journal of Sport Nutrition and Exercise Metabolism - March 8, 2024 Category: Sports Medicine Authors: Nathan Gobbi de Oliveira Luana Farias de Oliveira Rafael Pires da Silva Tamires Nunes Oliveira Gabriella Berwig M öller Juliana Murasaki Manoel Ant ônio Ramires Rafael de Almeida Azevedo Guilherme Giannini Artioli Hamilton Roschel Bruno Gualano Bryan Sa Source Type: research

Becoming a World Champion Powerlifter at 71 Years of Age: It Is Never Too Late to Start Exercising
In conclusion, even for resistance exercise naïve individuals, starting exercise at an advanced age can lead to improvements in body composition and muscle strength allowing older adults to reduce the risk for developing metabolic syndrome, live independently, and even compete at a world class level.PMID:38458181 | DOI:10.1123/ijsnem.2023-0230 (Source: International Journal of Sport Nutrition and Exercise Metabolism)
Source: International Journal of Sport Nutrition and Exercise Metabolism - March 8, 2024 Category: Sports Medicine Authors: Cas J Fuchs Jorn Trommelen Michelle E G Weijzen Joey S J Smeets Janneau van Kranenburg Lex B Verdijk Luc J C van Loon Source Type: research

Caffeine, but Not Creatine, Improves Anaerobic Power Without Altering Anaerobic Capacity in Healthy Men During a Wingate Anaerobic Test
In conclusion, CAF, but not CRE ingestion, increases anaerobic power. Conversely, neither CRE nor CAF has an effect on anaerobic capacity.PMID:38458183 | DOI:10.1123/ijsnem.2023-0191 (Source: International Journal of Sport Nutrition and Exercise Metabolism)
Source: International Journal of Sport Nutrition and Exercise Metabolism - March 8, 2024 Category: Sports Medicine Authors: Alisson Henrique Marinho Marcos David Silva-Cavalcante Gislaine Cristina-Souza Filipe Antonio de Barros Sousa Thays Ataide-Silva Romulo Bertuzzi Gustavo Gomes de Araujo Adriano Eduardo Lima-Silva Source Type: research