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.

Timing of Caffeine Ingestion Does Not Improve Three-Point Shooting Accuracy in College Basketball Players
This study investigated the effects of the timing of caffeine (3 mg/kg body mass) ingestion on three-point shooting accuracy and other performance parameters during a basketball exercise simulation test (BEST). Eighteen college basketball players (mean ± SD: age = 24.4 ± 1.5 years, height = 181.7 ± 9.5 cm, body mass = 80.9 ± 13.2 kg) underwent one familiarization trial and three main conditions in a randomized order: (a) placebo (maltodextrin) and placebo, (b) caffeine and placebo, and (c) placebo and caffeine. Participants ingested either the placebo or caffeine pill 75 and 15 min before performing four quarters of th...
Source: International Journal of Sport Nutrition and Exercise Metabolism - January 24, 2024 Category: Sports Medicine Authors: Zhi Sen Tan Rachelle Yahn Yee Sim Masato Kawabata Dorrain Yanwen Low Yulan Wang Stephen F Burns Source Type: research

Acute Beetroot Juice Supplementation Has No Effect on Upper- and Lower-Body Maximal Isokinetic Strength and Muscular Endurance in International-Level Male Gymnasts
This study examined the effect of acute beetroot juice (BRJ) supplementation on isokinetic strength and endurance of the upper- and lower-body in highly trained international-level male gymnasts. In a double-blind, randomized crossover design, 10 international-level male gymnasts completed two acute supplementation periods, consuming either 2 × 70 ml NO3--rich (∼12.8 mmol/L of NO3-) or NO3--depleted (PLA) BRJ. Maximal strength of the upper-leg and upper-arm at 60°/s, 120°/s, 180°/s, and 300°/s, and muscular endurance (50 repeated isokinetic contractions at 180°/s) were assessed. Plasma NO3- (BRJ: 663 ± 164 μM, PL...
Source: International Journal of Sport Nutrition and Exercise Metabolism - January 18, 2024 Category: Sports Medicine Authors: Ozcan Esen Joseph Fox Raci Karayigit Ian Walshe Source Type: research

Sweat Characteristics and Fluid Balance Responses During Two Heat Training Camps in Elite Female Field Hockey Players
We examined the sweat characteristics and fluid balance of elite female field hockey players during two heat training camps. Fourteen elite female field hockey players from the Australian national squad participated in two heat training camps held ∼6 months apart, following winter- (Camp 1) and summer-based training (Camp 2). Daily waking body mass (BM) and urine specific gravity (USG) were collected, along with several markers of sweat and fluid balance across two matches per camp. There was a 19% mean reduction in estimated whole-body sweat sodium concentration from Camp 1 (45.8 ± 6.5 mmol/L) to Camp 2 (37.0 ± 5.0 mm...
Source: International Journal of Sport Nutrition and Exercise Metabolism - January 12, 2024 Category: Sports Medicine Authors: Paul S R Goods Bradley Wall Brook Galna Alannah K A McKay Denise Jennings Peter Peeling Greig Watson Source Type: research

Pharmacokinetic Profile of Caffeine and Its Two Main Metabolites in Dried Blood Spots After Five Different Oral Caffeine Administration Forms-A Randomized Crossover Study
This study investigated the impact of five different formulations and administration routes of caffeine on the whole blood concentrations of caffeine, paraxanthine, and theobromine: caffeinated capsules, tablets, shots, pouches, and chewing gums. A uniform dose of caffeine (200 mg) was administered to 16 healthy recreational athletes (26.0 ± 2.1 years) using a randomized crossover design. Samples were taken in the form of dried blood spots at 16 different time points in a 2-hr timeframe after drug administration. The samples were analyzed using a validated liquid chromatography-tandem mass spectrometry method. The results...
Source: International Journal of Sport Nutrition and Exercise Metabolism - January 12, 2024 Category: Sports Medicine Authors: Chiara Tuma Andreas Thomas Lasse Trede Hans Braun Mario Thevis Source Type: research

Sex Differences in Hydration Biomarkers and Test-Retest Reliability Following Passive Dehydration
This study investigated (a) differences between males and females for changes in serum, tear, and urine osmolality, hematocrit, and urine specific gravity following acute passive dehydration and (b) assessed the reliability of these biomarkers separately for each sex. Fifteen males (age: 26.3 ± 3.5 years, body mass: 76 ± 7 kg) and 15 females (age: 28.8 ± 6.4 years, body mass: 63 ± 7 kg) completed a sauna protocol twice (5-28 days apart), aiming for 4% body mass loss (BML). Urine, blood, and tear markers were collected pre- and postdehydration, and change scores were calculated. Male BML was significantly greater than t...
Source: International Journal of Sport Nutrition and Exercise Metabolism - January 12, 2024 Category: Sports Medicine Authors: Colin S Doherty Lauren V Fortington Oliver R Barley Source Type: research

Auditing the Representation of Females Versus Males in Heat Adaptation Research
Int J Sport Nutr Exerc Metab. 2024 Jan 11:1-11. doi: 10.1123/ijsnem.2023-0186. Online ahead of print.ABSTRACTThe aim of this audit was to quantify female representation in research on heat adaptation. Using a standardized audit tool, the PubMed database was searched for heat adaptation literature from inception to February 2023. Studies were included if they investigated heat adaptation among female and male adults (≥18-50 years) who were free from noncommunicable diseases, with heat adaptation the primary or secondary outcome of interest. The number and sex of participants, athletic caliber, menstrual status, research t...
Source: International Journal of Sport Nutrition and Exercise Metabolism - January 11, 2024 Category: Sports Medicine Authors: Monica K Kelly Ella S Smith Harry A Brown William T Jardine Lilia Convit Steven J Bowe Dominique Condo Joshua H Guy Louise M Burke Julien D P ériard Rhiannon M J Snipe Rodney J Snow Amelia J Carr Source Type: research

Resistance Exercise Training, a Simple Intervention to Preserve Muscle Mass and Strength in Prostate Cancer Patients on Androgen Deprivation Therapy
Int J Sport Nutr Exerc Metab. 2023 Dec 4:1-13. doi: 10.1123/ijsnem.2023-0075. Online ahead of print.ABSTRACTAndrogen deprivation therapy (ADT) forms the cornerstone in the treatment of advanced prostate cancer. However, by suppressing testosterone ADT results in a decrease of skeletal muscle mass. In this narrative review, we explore the magnitude and mechanisms of ADT-induced muscle mass loss and the consequences for muscle strength and physical performance. Subsequently, we elucidate the effectiveness of supervised resistance exercise training as a means to mitigate these adverse effects. Literature shows that resistance...
Source: International Journal of Sport Nutrition and Exercise Metabolism - December 4, 2023 Category: Sports Medicine Authors: Lisanne H P Houben Milou Beelen Luc J C van Loon Sandra Beijer Source Type: research