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Journal of the International Society of Sports Nutrition

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https://www.readbyqxmd.com/read/30219082/biotin-and-chromium-histidinate-improve-glucose-metabolism-and-proteins-expression-levels-of-irs-1-ppar-%C3%AE-and-nf-%C3%AE%C2%BAb-in-exercise-trained-rats
#1
Mine Turgut, Vedat Cinar, Ragip Pala, Mehmet Tuzcu, Cemal Orhan, Hafize Telceken, Nurhan Sahin, Patrick Brice Defo Deeh, James R Komorowski, Kazim Sahin
BACKGROUND: Chromium histidinate (CrHis) and biotin are micronutrients commonly used to improve health by athletes and control glycaemia by patients with diabetes. This study investigates the effects of 8-week regular exercise training in rats together with dietary CrHis and biotin supplementation on glucose, lipids and transaminases levels, as well as protein expression levels of peroxisome proliferator-activated receptor gamma (PPAR-γ), insulin receptor substrate-1 (IRS-1) and nuclear transcription factor kappa B (NF-κB)...
September 15, 2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/30217203/dietary-intake-of-professional-australian-football-athletes-surrounding-body-composition-assessment
#2
Sarah Louise Jenner, Gina Trakman, Aaron Coutts, Thomas Kempton, Samuel Ryan, Adrienne Forsyth, Regina Belski
BACKGROUND: Sports Dietitians aim to assist in improving performance by developing nutrition knowledge (NK), enhancing dietary intake and optimising body composition of athletes. In a high-pressure environment, it is important to identify factors that may compromise an athlete's nutrition status. Body composition assessments are regularly undertaken in sport to provide feedback on training adaptions; however, no research has explored the impact of these assessments on the dietary intake of professional athletes...
September 14, 2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/30217199/development-and-validation-of-a-dietary-screener-for-carbohydrate-intake-in-endurance-athletes
#3
Stéphanie Harrison, Élise Carbonneau, Denis Talbot, Simone Lemieux, Benoît Lamarche
BACKGROUND: Studies have shown that the majority of endurance athletes do not achieve the minimal recommended carbohydrate (CHO) intake of 6 g/kg of body weight (BW), with potentially negative impacts on recovery and performance. The purpose of this study was to develop and validate a rapid and easy to use dietary screener to identify athletes who do and do not achieve a CHO intake > 6 g/kg BW in the context of endurance sports. METHODS: The dietary screener was developed using multiple logistic regression modeling of data from a sample of 1571 non-athlete adults (826 women and 745 men, mean age 44...
September 14, 2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/30097067/citrulline-malate-supplementation-does-not-improve-german-volume-training-performance-or-reduce-muscle-soreness-in-moderately-trained-males-and-females
#4
RANDOMIZED CONTROLLED TRIAL
Andrew J Chappell, Daniel M Allwood, Rebecca Johns, Samantha Brown, Kiran Sultana, Annie Anand, Trevor Simper
BACKGROUND: Use of supplements to aid performance is common practice amongst recreationally active individuals, including those without a sufficient evidence base. This investigation sought to assess whether acute supplementation with 8 g of citrulline malate (CM) (1.11: 1 ratio) would improve anaerobic performance. METHODS: A randomised double blind placebo control trial was employed, using a counterbalanced design. We recruited recreationally active men and women to take part in an isokinetic chair protocol, based on German Volume Training (GVT) whereby participants attempted to perform 10 sets of 10 repetitions against a force representing 70% of their peak concentric force...
August 10, 2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/30124167/a-fat-mass-and-obesity-associated-gene-polymorphism-influences-fat-mass-in-exercise-trained-individuals
#5
Jose Antonio, Sarah Knafo, Ritishka Kapoor, Jaime L Tartar
BACKGROUND: A single nucleotide polymorphism (SNP) in the fat mass and obesity-associated (FTO) gene is a strong predictor of obesity in humans. The FTO SNP (rs1421085) results in a T to C nucleotide substitution that may result in an increased risk for obesity in individuals who carry at least one C allele. The purpose of this investigation was to characterize the FTO genotype in a cohort of exercise-trained men and women. METHODS: We tested 108 exercise-trained individuals that included professional mixed martial arts fighters, competitive distance runners, collegiate swimmers, stand-up paddlers as well as a cohort of recreational bodybuilders...
August 8, 2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/30089501/multi-ingredient-pre-workout-supplements-safety-implications-and-performance-outcomes-a-brief-review
#6
REVIEW
Patrick S Harty, Hannah A Zabriskie, Jacob L Erickson, Paul E Molling, Chad M Kerksick, Andrew R Jagim
In recent years, a new class of dietary supplements called multi-ingredient pre-workout supplements (MIPS) has increased in popularity. These supplements are intended to be taken prior to exercise and typically contain a blend of ingredients such as caffeine, creatine, beta-alanine, amino acids, and nitric oxide agents, the combination of which may elicit a synergistic effect on acute exercise performance and subsequent training adaptations compared to single ingredients alone. Therefore, the purpose of this article was to review the theoretical rationale and available scientific evidence assessing the potential ergogenic value of acute and chronic ingestion of MIPS, to address potential safety concerns surrounding MIPS supplementation, and to highlight potential areas for future research...
August 8, 2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/30071871/efficacy-of-heat-killed-lactococcus-lactis-jcm-5805-on-immunity-and-fatigue-during-consecutive-high-intensity-exercise-in-male-athletes-a-randomized-placebo-controlled-double-blinded-trial
#7
RANDOMIZED CONTROLLED TRIAL
Yuta Komano, Kazunori Shimada, Hisashi Naito, Kosuke Fukao, Yoshihiko Ishihara, Toshio Fujii, Takeshi Kokubo, Hiroyuki Daida
BACKGROUND: Lactococcus lactis JCM 5805 (LC-Plasma) is a unique lactic acid bacteria (LAB) which activates plasmacytoid dendritic cells (pDC). We aimed to evaluate the effect of LC-Plasma on dendritic cell (DC) activity and subjective indices of upper respiratory tract infections (URTI) and fatigue in athletes under high intensity exercise. METHODS: We conducted a randomized, placebo-controlled, double-blinded trial. Fifty-one male subjects belonging to a university sports club were randomized into placebo (n = 25) and LC-Plasma (n = 26) groups...
August 2, 2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/30068354/issn-exercise-sports-nutrition-review-update-research-recommendations
#8
REVIEW
Chad M Kerksick, Colin D Wilborn, Michael D Roberts, Abbie Smith-Ryan, Susan M Kleiner, Ralf Jäger, Rick Collins, Mathew Cooke, Jaci N Davis, Elfego Galvan, Mike Greenwood, Lonnie M Lowery, Robert Wildman, Jose Antonio, Richard B Kreider
BACKGROUND: Sports nutrition is a constantly evolving field with hundreds of research papers published annually. In the year 2017 alone, 2082 articles were published under the key words 'sport nutrition'. Consequently, staying current with the relevant literature is often difficult. METHODS: This paper is an ongoing update of the sports nutrition review article originally published as the lead paper to launch the Journal of the International Society of Sports Nutrition in 2004 and updated in 2010...
August 1, 2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/30064450/the-effects-of-chronic-betaine-supplementation-on-body-composition-and-performance-in-collegiate-females-a-double-blind-randomized-placebo-controlled-trial
#9
RANDOMIZED CONTROLLED TRIAL
Jason Michael Cholewa, Andrea Hudson, Taylor Cicholski, Amanda Cervenka, Karley Barreno, Kayla Broom, McKenzie Barch, Stuart A S Craig
BACKGROUND: Betaine supplementation has been shown to improve body composition and some metrics of muscular performance in young men; but, whether betaine enhances body composition or performance in female subjects is currently unknown. Therefore, the purpose of this study was to investigate the interaction between resistance training adaptation and chronic betaine supplementation in females. METHODS: Twenty-three young women (21.0 ± 1.4 years, 165.9 ± 6...
July 31, 2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/30045722/correction-to-the-effect-of-acute-vs-chronic-magnesium-supplementation-on-exercise-and-recovery-on-resistance-exercise-blood-pressure-and-total-peripheral-resistance-on-normotensive-adults
#10
L S Kass, F Poeira
The original article [1] contains an error whereby the datum value of '17.7%' in both the Abstract and the first line of the Bench press sub-section of the Results section is incorrect.
July 25, 2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/30041701/the-impact-of-supplementation-with-pomegranate-fruit-punica-granatum-l-juice-on-selected-antioxidant-parameters-and-markers-of-iron-metabolism-in-rowers
#11
RANDOMIZED CONTROLLED TRIAL
A Urbaniak, P Basta, K Ast, A Wołoszyn, J Kuriańska-Wołoszyn, Ewa Latour, A Skarpańska-Stejnborn
BACKGROUND: The aim of this study was to analyse the effect of pomegranate juice (POM) supplementation on the levels of selected pro-inflammatory cytokines, hepcidin and markers of iron metabolism in well-trained rowers. METHOD: The double-blind placebo-controlled study included 19 members of the Polish Rowing Team. The athletes were randomised into the supplemented group (n = 10), receiving 50 ml of standardised POM daily for two months, or the placebo group (n = 9)...
July 24, 2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/30041682/the-influence-of-citrus-aurantium-and-caffeine-complex-versus-placebo-on-the-cardiac-autonomic-response-a-double-blind-crossover-design
#12
RANDOMIZED CONTROLLED TRIAL
Brian Kliszczewicz, Emily Bechke, Cassie Williamson, Paul Bailey, Wade Hoffstetter, John McLester, Cherilyn McLester
BACKGROUND: The purpose of this study was to examine the resting cardiac autonomic nervous system's response to the ingestion of a complex containing Citrus aurantium + Caffeine (CA + C) and its influence on 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, which consisted of two exhaustive exercise protocols in a randomized crossover design...
July 24, 2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/30016961/quality-of-life-of-female-and-male-vegetarian-and-vegan-endurance-runners-compared-to-omnivores-results-from-the-nurmi-study-step-2
#13
Patrick Boldt, Beat Knechtle, Pantelis Nikolaidis, Christoph Lechleitner, Gerold Wirnitzer, Claus Leitzmann, Thomas Rosemann, Katharina Wirnitzer
BACKGROUND: Health-related effects of a vegetarian or vegan diet are known to support parameters positively affecting exercise performance in athletes, whereas knowledge about psyche and wellbeing is sparse. Therefore, the aim of the Nutrition and Running High Mileage (NURMI) Study (Step 2) was to compare Quality of Life (QOL) scores among endurance runners following a vegetarian or vegan diet against those who adhere to an omnivorous diet. METHODS: The study was conducted following a cross-sectional design...
July 17, 2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29996843/%C3%AE-alanine-supplementation-increased-physical-performance-and-improved-executive-function-following-endurance-exercise-in-middle-aged-individuals
#14
RANDOMIZED CONTROLLED TRIAL
Taylor Furst, Alyssa Massaro, Courtney Miller, Brian T Williams, Zach M LaMacchia, Peter J Horvath
BACKGROUND: Sarcopenia, a reduction in muscle mass and function seen in aging populations, may be countered by improving systemic carnosine stores via beta-Alanine (β-alanine) supplementation. Increasing systemic carnosine levels may result in enhanced anti-oxidant, neuro-protective and pH buffering capabilities. This enhancement should result in improved exercise capacity and executive function. METHODS: Twelve healthy adults (average age = 60.5 ± 8.6 yrs, weight = 81...
July 11, 2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29986720/efficacy-of-ketogenic-diet-on-body-composition-during-resistance-training-in-trained-men-a-randomized-controlled-trial
#15
RANDOMIZED CONTROLLED TRIAL
Salvador Vargas, Ramón Romance, Jorge L Petro, Diego A Bonilla, Ismael Galancho, Sergio Espinar, Richard B Kreider, Javier Benítez-Porres
BACKGROUND: Ketogenic diets (KD) have become a popular method of promoting weight loss. More recently, some have recommended that athletes adhere to ketogenic diets in order to optimize changes in body composition during training. This study evaluated the efficacy of an 8-week ketogenic diet (KD) during energy surplus and resistance training (RT) protocol on body composition in trained men. METHODS: Twenty-four healthy men (age 30 ± 4.7 years; weight 76.7 ± 8...
July 9, 2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29945625/eight-weeks-of-resistance-training-in-conjunction-with-glutathione-and-l-citrulline-supplementation-increases-lean-mass-and-has-no-adverse-effects-on-blood-clinical-safety-markers-in-resistance-trained-males
#16
RANDOMIZED CONTROLLED TRIAL
Paul Hwang, Flor E Morales Marroquín, Josh Gann, Tom Andre, Sarah McKinley-Barnard, Caelin Kim, Masahiko Morita, Darryn S Willoughby
BACKGROUND: Supplementation of combined glutathione (GSH) with L-citrulline in response to a single bout of resistance exercise has been shown to increase plasma nitric oxide metabolites, nitrite and nitrate and cyclic guanosine monophosphate (cGMP), which may play a role in muscle protein synthesis. As a result, in response to resistance training (RT) these responses may establish a role for GSH + L-citrulline to increase muscle mass. This study attempted to determine the effects of an 8-week RT program in conjunction with GSH (Setria®) + L-citrulline, L-citrulline-malate, or placebo supplementation on lean mass and its association with muscle strength...
June 27, 2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29914522/low-fat-diet-and-medium-fat-diets-containing-coconut-oil-and-soybean-oil-exert-different-metabolic-effects-in-untrained-and-treadmill-trained-mice
#17
Mark Christian Manio, Shigenobu Matsumura, Kazuo Inoue
BACKGROUND: Diets containing fats of different proportions and types have been demonstrated to influence metabolism. These fats differ in long chain fatty acids (LCFAs) or medium chain fatty acids (MCFAs) content. In our laboratory using swimming as the training modality, MCFAs increased endurance attributed to increased activities of oxidative enzymes. How it affects whole-body metabolism remains unexplored. The present study investigated the metabolic, biochemical and genetic adaptations with treadmill running as the training modality...
June 18, 2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29898738/serum-concentration-of-cobalt-molybdenum-and-zinc-in-aerobic-anaerobic-and-aerobic-anaerobic-sportsmen
#18
Marcos Maynar, Francisco Llerena, Francisco Javier Grijota, Mario Pérez-Quintero, Ignacio Bartolomé, Javier Alves, María Concepción Robles, Diego Muñoz
BACKGROUND: The aim of the present study was to determine changes in the serum concentrations of trace elements Cobalt (Co), Molybdenum (Mo) and Zinc (Zn) among high-level sportsmen. METHODS: Eighty professional athletes of different metabolic modalities (aerobic, anaerobic and aerobic-anaerobic), were recruited before the beginning of their training seasons. Thirty-one sedentary participants of the same geographic area constituted the control group. Co, Mo and Zn analysis was performed by Inductively Coupled Plasma Mass Spectrometry (ICP-MS)...
June 13, 2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29866199/individualized-hydration-plans-improve-performance-outcomes-for-collegiate-athletes-engaging-in-in-season-training
#19
RANDOMIZED CONTROLLED TRIAL
David Ayotte, Michael P Corcoran
BACKGROUND: Athletes commonly consume insufficient fluid and electrolytes just prior to, or during training and competition. Unlike non-athletes or athletes who do not engage in frequent rigorous and prolonged training sessions, "hard trainers" may require additional sodium and better benefit from a hydration plan tailored to their individual physiology. The purpose of this randomized cross-over study was to determine whether a hydration plan based off of an athlete's sweat rate and sodium loss improves anaerobic and neurocognitive performance during a moderate to hard training session as well as heart rate recovery from this session...
June 4, 2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29855372/impact-of-a-purported-nootropic-supplementation-on-measures-of-mood-stress-and-marksmanship-performance-in-u-s-active-duty-soldiers
#20
RANDOMIZED CONTROLLED TRIAL
Nicholas Barringer, Aaron Crombie, Russ Kotwal
BACKGROUND: The purpose of this study was to determine the impact of a commercially available purported nootropic supplement on mood, stress, and rifle marksmanship accuracy and engagement time via an Engagement Skills Trainer. METHODS: In this double-blind, placebo-controlled trial, 43 U.S. active duty Soldiers participating in a professional military course were assigned to treatment (n = 20; 16 males and 4 females) or placebo (n = 23; 15 males and 8 females) based on initial marksmanship score...
May 31, 2018: Journal of the International Society of Sports Nutrition
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