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Journal of the International Society of Sports Nutrition

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https://read.qxmd.com/read/30755234/chocolate-milk-versus-carbohydrate-supplements-in-adolescent-athletes-a-field-based-study
#1
Katelyn A Born, Erin E Dooley, P Andy Cheshire, Lauren E McGill, Jonathon M Cosgrove, John L Ivy, John B Bartholomew
PURPOSE: The purpose of this study is to translate laboratory-based research on beverage-based supplements to a naturalistic, field setting in adolescent athletes. To this end, we tested the effects of two commercially-available drinks on strength in a field-based setting with both male and female high school athletes completing a summer training program. METHODS: One hundred and three high school athletes completed the study (M age = 15.3, SD = 1.2; 70...
February 12, 2019: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/30744654/rehydrating-efficacy-of-maple-water-after-exercise-induced-dehydration
#2
Alexs Matias, Monique Dudar, Josip Kauzlaric, Kimberly A Frederick, Shannon Fitzpatrick, Stephen J Ives
Dehydration impairs physiological function and physical performance, thus understanding effective rehydration strategies is paramount. Despite growing interest in natural rehydrating beverages, no study has examined maple water (MW). PURPOSE: To investigate the rehydrating efficacy of MW after exercise-induced dehydration. METHODS: Using a single-blind, counterbalanced, crossover design, we compared the rehydrating efficacy of MW vs. maple-flavored bottled water (control) in 26 young healthy (22 ± 4 yrs...
February 11, 2019: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/30728074/the-effects-of-shilajit-supplementation-on-fatigue-induced-decreases-in-muscular-strength-and-serum-hydroxyproline-levels
#3
Joshua L Keller, Terry J Housh, Ethan C Hill, Cory M Smith, Richard J Schmidt, Glen O Johnson
BACKGROUND: Shilajit is a safe, fluvic mineral complex exudate that is common to Ayurvedic medicine and is composed of fulvic acids, dibenzo-α-pyrones, proteins, and minerals. The purpose of this study was to examine the effects of 8 weeks of Shilajit supplementation at 250 mg·d- 1 (low dose) and 500 mg·d- 1 (high dose) versus placebo on maximal voluntary isometric contraction (MVIC) strength, concentric peak torque, fatigue-induced percent decline in strength, and serum hydroxyproline (HYP)...
February 6, 2019: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/30728061/citrus-aurantium-and-caffeine-complex-versus-placebo-on-biomarkers-of-metabolism-a-double-blind-crossover-design
#4
Brian Kliszczewicz, Emily Bechke, Cassie Williamson, Zackery Green, Paul Bailey, John McLester, Cherilyn McLester
BACKGROUOND: The purpose of this study was to examine resting the metabolic response to the ingestion of a complex containing Citrus Aurantium + Caffeine (CA + C) and if its consumption influences metabolic recovery following a high-intensity anaerobic exercise bout in habitual caffeine users. METHODS: Ten physically active males (25.1 ± 3.9 years; weight 78.71 ± 9.53 kg; height 177.2 ± 4.6 cm; body fat 15.5 ± 3.13%) participated in this study...
February 6, 2019: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/30665439/effects-of-ascorbic-acid-supplementation-on-oxidative-stress-markers-in-healthy-women-following-a-single-bout-of-exercise
#5
RANDOMIZED CONTROLLED TRIAL
Manita Yimcharoen, Suwatsin Kittikunnathum, Chawannut Suknikorn, Wichuda Nak-On, Petcharee Yeethong, Tracy G Anthony, Piyawan Bunpo
BACKGROUND: Ascorbic acid is a water-soluble chain breaking antioxidant. It scavenges free radicals and reactive oxygen species (ROS), which are produced during metabolic pathways. Exercise can produce an imbalance between ROS and antioxidants, leading to oxidative stress-related tissue damages. This study was designed to determine the effects of ascorbic acid supplementation on circulating biomarkers of oxidative stress and muscle damage following a single bout of exercise. METHODS: In a crossover design with a 1 wk...
January 21, 2019: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/30646926/effect-of-a-short-term-low-fermentable-oligiosaccharide-disaccharide-monosaccharide-and-polyol-fodmap-diet-on-exercise-related-gastrointestinal-symptoms
#6
RANDOMIZED CONTROLLED TRIAL
Melanie Wiffin, Lee Smith, Jose Antonio, James Johnstone, Liam Beasley, Justin Roberts
BACKGROUND: Research has demonstrated that low fermentable oligiosaccharide, disaccharide, monosaccharide and polyol (FODMAP) diets improve gastrointestinal (GI) symptoms in irritable bowel syndrome sufferers. Exercise-related GI issues are a common cause of underperformance, with current evidence focusing on the use of FODMAP approaches with recreationally competitive or highly trained athletes. However, there is a paucity of research exploring the potential benefit of FODMAP strategies to support healthy, recreational athletes who experience GI  issues during training...
January 15, 2019: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/30594211/acute-caffeine-supplementation-in-combat-sports-a-systematic-review
#7
REVIEW
Luis M López-González, Antonio J Sánchez-Oliver, Fernando Mata, Pablo Jodra, Jose Antonio, Raúl Domínguez
Caffeine used as a supplement has been shown to improve physical and cognitive performance in several sport modalities due to its effects on the central nervous system. This review assesses the direct effects of caffeine supplementation on performance in combat sports. Using the PRISMA (Preferred Reporting Items for Systematic Review and Meta-Analysis) guidelines, relevant studies were identified through the Medline, Scopus and SPORTDiscus databases. Of 1053 search results, only 9 articles fulfilled the inclusion criteria...
December 29, 2018: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/30563538/the-effect-of-two-%C3%AE-alanine-dosing-strategies-on-30-minute-rowing-performance-a-randomized-controlled-trial
#8
RANDOMIZED CONTROLLED TRIAL
Liam Beasley, Lee Smith, Jose Antonio, Dan Gordon, James Johnstone, Justin Roberts
BACKGROUND: β-alanine (βA) supplementation has been shown to increase intramuscular carnosine content and subsequent high-intensity performance in events lasting < 4 minutes (min), which may be dependent on total, as opposed to daily, dose. The ergogenic effect of βA has also been demonstrated for 2000-m rowing performance prompting interest in whether βA may be beneficial for sustained aerobic exercise. This study therefore investigated the effect of two βA dosing strategies on 30-min rowing and subsequent sprint performance...
December 18, 2018: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/30541572/efficacy-of-a-nootropic-spearmint-extract-on-reactive-agility-a-randomized-double-blind-placebo-controlled-parallel-trial
#9
RANDOMIZED CONTROLLED TRIAL
Paul H Falcone, Aaron C Tribby, Roxanne M Vogel, Jordan M Joy, Jordan R Moon, Chantelle A Slayton, Micah M Henigman, Joanne A Lasrado, Brandon J Lewis, Brenda A Fonseca, Kristin M Nieman, Kelli A Herrlinger
BACKGROUND: Proprietary spearmint extract (PSE) containing a minimum 14.5% rosmarinic acid and 24% total phenolic content, has evinced positive effects on cognition in individuals aged 50-70 with memory impairment after chronic supplementation. To address the growing interest in connecting mental and physical performance, the present study examined whether the nootropic effects of PSE translate into changes in reactive agility following daily supplementation with PSE. METHODS: Utilizing a randomized, double-blind, placebo-controlled, parallel design, healthy, recreationally-active men and women (n = 142) received 900 mg of PSE or placebo (PLA) daily for 90 days...
December 12, 2018: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/30526607/priority-use-of-medium-chain-fatty-acids-during-high-intensity-exercise-in-cross-country-skiers
#10
A Yu Lyudinina, G E Ivankova, E R Bojko
BACKGROUND: One of the topics discussed in sports science is the use of medium-chain saturated fat as an energy-saving nutrient additive when approaching high-intensity exercise. The purpose of this study was to compare the blood concentrations of medium-chain and long-chain fatty acids (FAs) across different intensity loads. METHODS: Fifteen male highly trained athletes from the Russian cross-country skiing team participated in the study. Blood samples were drawn at rest, at the peak of veloergometric test with a growing exercise load till exhaustion (97-100% VO2max), and after competitions...
December 10, 2018: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/30497484/metabolic-impact-of-protein-feeding-prior-to-moderate-intensity-treadmill-exercise-in-a-fasted-state-a-pilot-study
#11
RANDOMIZED CONTROLLED TRIAL
Bradley T Gieske, Richard A Stecker, Charles R Smith, Kyle E Witherbee, Patrick S Harty, Robert Wildman, Chad M Kerksick
BACKGROUND: Augmenting fat oxidation is a primary goal of fitness enthusiasts and individuals desiring to improve their body composition. Performing aerobic exercise while fasted continues to be a popular strategy to achieve this outcome, yet little research has examined how nutritional manipulations influence energy expenditure and/or fat oxidation during and after exercise. Initial research has indicated that pre-exercise protein feeding may facilitate fat oxidation while minimizing protein degradation during exercise, but more research is needed to determine if the source of protein further influences such outcomes...
November 29, 2018: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/30486851/estimation-of-energy-balance-and-training-volume-during-army-initial-entry-training
#12
Jeremy McAdam, Kaitlin McGinnis, Rian Ory, Kaelin Young, Andrew D Frugé, Michael Roberts, JoEllen Sefton
BACKGROUND: Adequate dietary intake is important for promoting adaptation and prevention of musculoskeletal injury in response to large volumes of physical training such as Army Initial Entry Training (IET). The purpose of this study was to evaluate training volume and dietary intake and estimate energy balance in Army IET soldiers. METHODS: Dietary intake was assessed by collecting diet logs for three meals on each of three, non-consecutive days during the first week of IET...
November 28, 2018: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/30482225/correction-to-paks-supplement-improves-immune-status-and-body-composition-but-not-muscle-strength-in-resistance-trained-individuals
#13
Frederico G Romero, Fabio S Lira, Fernando A Marques, Paulo C Muzy, Rodolfo A N Peres, Érico C Caperuto
The original article [1] contains an error whereby the author, Frederico G Romero's name is displayed incorrectly; the correct spelling is instead displayed in this Correction article.
November 27, 2018: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/30367639/exercise-training-alters-the-glycemic-response-to-carbohydrate-and-is-an-important-consideration-when-evaluating-dietary-carbohydrate-intake
#14
LETTER
Charles Paul Lambert
Carbohydrates raise insulin concentrations in blood. Exercise decreases the insulin response to carbohydrate infusion and is beneficial in reducing postprandial glucose and insulin concentrations. This is important as there has been recent information suggesting postprandial insulin concentrations are linked to obesity (Carbohydrate-Insulin Model of Obesity). The validity of this model may be in question in face of chronic exercise.
October 26, 2018: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/30348185/combined-extracts-of-garcinia-mangostana-fruit-rind-and-cinnamomum-tamala-leaf-supplementation-enhances-muscle-strength-and-endurance-in-resistance-trained-males
#15
RANDOMIZED CONTROLLED TRIAL
Manikyeswara Rao Konda, Krishnaraju Venkata Alluri, Prason Kumar Janardhanan, Golakoti Trimurtulu, Krishanu Sengupta
BACKGROUND: A proprietary composition GMCT contains extracts of two popular Asian herbs viz., Garcinia mangostana (GM) fruit rind and Cinnamomum tamala (CT) leaf. We systematically evaluated physical performance and muscle strength enhancing ability of GMCT in a preclinical mouse model followed by a 42-days double-blind placebo controlled human trial in resistance trained adult males. METHODS: Four groups of Swiss albino mice (20-30 g body weight) (n = 6) were fed a standard laboratory diet and given Carboxymethylcellulose sodium (CMC), 150 mg/kg GMCT (GMCT-150), 300 mg/kg GMCT (GMCT-300) or 50 mg/kg Oxymetholone (OXY) via oral gavage for 21 days...
October 22, 2018: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/30348178/the-acute-effects-of-plyometric-and-sled-towing-stimuli-with-and-without-caffeine-ingestion-on-vertical-jump-performance-in-professional-soccer-players
#16
RANDOMIZED CONTROLLED TRIAL
Mauro A Guerra, Leonardo C Caldas, Helder L De Souza, Kaio F Vitzel, Jason M Cholewa, Michael J Duncan, Lucas Guimarães-Ferreira
BACKGROUND: Post-activation potentiation (PAP) is the phenomenon by which muscular performance is enhanced in response to a conditioning stimulus. PAP has typically been evidenced via improved counter movement jump (CMJ) performance. This study examined the effects of PAP, with and without prior caffeine ingestion, on CMJ performance. METHODS: Twelve male professional soccer players (23 ± 5 years) performed two trials of plyometric exercises and sled towing 60 min after placebo or caffeine ingestion (5 mg...
October 22, 2018: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/30286760/effects-of-a-single-dose-of-beetroot-juice-on-cycling-time-trial-performance-at-ventilatory-thresholds-intensity-in-male-triathletes
#17
RANDOMIZED CONTROLLED TRIAL
Manuel Vicente Garnacho-Castaño, Guillem Palau-Salvà, Eduardo Cuenca, Arturo Muñoz-González, Pablo García-Fernández, María Del Carmen Lozano-Estevan, Pablo Veiga-Herreros, José Luis Maté-Muñoz, Raúl Domínguez
BACKGROUND: Beetroot juice (BJ) is classified as a high-level supplement for improving sports performance. There is some controversy over the benefits of BJ supplementation for endurance exercise performance, especially when referring to well-trained athletes. This study examines the effects of acute BJ supplementation on cardioventilatory responses, exercise economy/efficiency, slow component of oxygen uptake, time trial performance, blood lactate, energy consumption, and carbohydrate and fat oxidation...
October 4, 2018: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/30261929/metabolomics-profiling-of-xenobiotics-in-elite-athletes-relevance-to-supplement-consumption
#18
Fatima Al-Khelaifi, Ilhame Diboun, Francesco Donati, Francesco Botrè, Mohammed Alsayrafi, Costas Georgakopoulos, Noha A Yousri, Karsten Suhre, Mohamed A Elrayess
BACKGROUND: Supplements are widely used among elite athletes to maintain health and improve performance. Despite multiple studies investigating use of dietary supplements by athletes, a comprehensive profiling of serum supplement metabolites in elite athletes is still lacking. This study aims to analyze the presence of various xenobiotics in serum samples from elite athletes of different sports, focusing on metabolites that potentially originate from nutritional supplements. METHODS: Profiling of xenobiotics in serum samples from 478 elite athletes from different sports (football, athletics, cycling, rugby, swimming, boxing and rowing) was performed using non-targeted metabolomics-based mass spectroscopy combined with ultrahigh-performance liquid chromatography...
September 27, 2018: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/30261892/the-effect-of-chronic-soluble-keratin-supplementation-in-physically-active-individuals-on-body-composition-blood-parameters-and-cycling-performance
#19
RANDOMIZED CONTROLLED TRIAL
Emma M Crum, Yanita D McLeay, Matthew J Barnes, Stephen R Stannard
BACKGROUND: Keratins are structural, thiol-rich proteins, which comprise 90% of total poultry feather weight. Their favourable amino acid profile suggests the potential for use as a protein source and ergogenic aid for endurance athletes, following treatment to increase digestibility. This study investigated whether 4 weeks of soluble keratin (KER) consumption (0.8 g/kg bodyweight/day) by 15 endurance-trained males would have favourable effects on body composition, blood and cardiorespiratory variables, and cycling performance, compared to casein protein (CAS)...
September 27, 2018: Journal of the International Society of Sports Nutrition
https://read.qxmd.com/read/30241477/comparison-of-a-sports-hydration-drink-containing-high-amylose-starch-with-usual-hydration-practice-in-australian-rules-footballers-during-intense-summer-training
#20
RANDOMIZED CONTROLLED TRIAL
Sinead Mary O'Connell, Richard John Woodman, Ian Lewis Brown, David Julian Vincent, Henry Joseph Binder, Balakrishnan Siddartha Ramakrishna, Graeme Paul Young
BACKGROUND: Fluid deficits exceeding 1.6% can lead to physical and cognitive impairment in athletes. Sport drinks used by athletes are often hyper-osmolar but this is known to be suboptimal for rehydration in medical settings and does not utilize colonic absorptive capacity. Colonic absorption can be enhanced by fermentative production of short chain fatty acids (SCFA) from substrates such as high amylose maize starch (HAMS). This study therefore compared, in elite Australian Football League (AFL) players at the height of outdoor summer training, a novel dual-action sports oral rehydration strategy that contained HAMS as well as glucose, to their usual rehydration practices (Control)...
September 21, 2018: Journal of the International Society of Sports Nutrition
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