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Journal of the International Society of Sports Nutrition

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https://www.readbyqxmd.com/read/30367639/exercise-training-alters-the-glycemic-response-to-carbohydrate-and-is-an-important-consideration-when-evaluating-dietary-carbohydrate-intake
#1
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://www.readbyqxmd.com/read/30348185/combined-extracts-of-garcinia-mangostana-fruit-rind-and-cinnamomum-tamala-leaf-supplementation-enhances-muscle-strength-and-endurance-in-resistance-trained-males
#2
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://www.readbyqxmd.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
#3
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://www.readbyqxmd.com/read/30286760/effects-of-a-single-dose-of-beetroot-juice-on-cycling-time-trial-performance-at-ventilatory-thresholds-intensity-in-male-triathletes
#4
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://www.readbyqxmd.com/read/30261929/metabolomics-profiling-of-xenobiotics-in-elite-athletes-relevance-to-supplement-consumption
#5
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://www.readbyqxmd.com/read/30261892/the-effect-of-chronic-soluble-keratin-supplementation-in-physically-active-individuals-on-body-composition-blood-parameters-and-cycling-performance
#6
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://www.readbyqxmd.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
#7
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
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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