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Journal of the International Society of Sports Nutrition

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https://www.readbyqxmd.com/read/28924423/vegan-diets-practical-advice-for-athletes-and-exercisers
#1
REVIEW
David Rogerson
With the growth of social media as a platform to share information, veganism is becoming more visible, and could be becoming more accepted in sports and in the health and fitness industry. However, to date, there appears to be a lack of literature that discusses how to manage vegan diets for athletic purposes. This article attempted to review literature in order to provide recommendations for how to construct a vegan diet for athletes and exercisers. While little data could be found in the sports nutrition literature specifically, it was revealed elsewhere that veganism creates challenges that need to be accounted for when designing a nutritious diet...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28919844/practical-nutritional-recovery-strategies-for-elite-soccer-players-when-limited-time-separates-repeated-matches
#2
REVIEW
Mayur Krachna Ranchordas, Joel T Dawson, Mark Russell
Specific guidelines that aim to facilitate the recovery of soccer players from the demands of training and a congested fixture schedule are lacking; especially in relation to evidence-based nutritional recommendations. The importance of repeated high level performance and injury avoidance while addressing the challenges of fixture scheduling, travel to away venues, and training commitments requires a strategic and practically feasible method of implementing specific nutritional strategies. Here we present evidence-based guidelines regarding nutritional recovery strategies within the context of soccer...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28919843/the-effects-of-phenylalanine-on-exercise-induced-fat-oxidation-a-preliminary-double-blind-placebo-controlled-crossover-trial
#3
Keisuke Ueda, Chiaki Sanbongi, Makoto Yamaguchi, Shuji Ikegami, Takafumi Hamaoka, Satoshi Fujita
BACKGROUND: When combined with exercise, dietary amino acid (AA) supplementation is an effective method for accelerating fat mobilization. However, the effects of single AAs combined with exercise on fat oxidation remains unclear. We hypothesized that consumption of a specific amino acid, L- phenylalanine, may result in the secretion of glucagon, and when combined with exercise may promote fat oxidation. METHODS: Six healthy, active male volunteers were randomized in a crossover study to ingest either phenylalanine (3 g/dose) or placebo...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28919842/international-society-of-sports-nutrition-position-stand-nutrient-timing
#4
REVIEW
Chad M Kerksick, Shawn Arent, Brad J Schoenfeld, Jeffrey R Stout, Bill Campbell, Colin D Wilborn, Lem Taylor, Doug Kalman, Abbie E Smith-Ryan, Richard B Kreider, Darryn Willoughby, Paul J Arciero, Trisha A VanDusseldorp, Michael J Ormsbee, Robert Wildman, Mike Greenwood, Tim N Ziegenfuss, Alan A Aragon, Jose Antonio
The International Society of Sports Nutrition (ISSN) provides an objective and critical review regarding the timing of macronutrients in reference to healthy, exercising adults and in particular highly trained individuals on exercise performance and body composition. The following points summarize the position of the ISSN:Nutrient timing incorporates the use of methodical planning and eating of whole foods, fortified foods and dietary supplements. The timing of energy intake and the ratio of certain ingested macronutrients may enhance recovery and tissue repair, augment muscle protein synthesis (MPS), and improve mood states following high-volume or intense exercise...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28878590/enzymatically-modified-isoquercitrin-supplementation-intensifies-plantaris-muscle-fiber-hypertrophy-in-functionally-overloaded-mice
#5
Akiko Kohara, Masanao Machida, Yuko Setoguchi, Ryouichi Ito, Masanori Sugitani, Hiroko Maruki-Uchida, Hiroyuki Inagaki, Tatsuhiko Ito, Naomi Omi, Tohru Takemasa
BACKGROUND: Enzymatically modified isoquercitrin (EMIQ) is produced from rutin using enzymatic hydrolysis followed by treatment with glycosyltransferase in the presence of dextrin to add glucose residues. EMIQ is absorbed in the same way as quercetin, a powerful antioxidant reported to prevent disused muscle atrophy by targeting mitochondria and to have ergogenic effects. The present study investigated the effect of EMIQ on skeletal muscle hypertrophy induced by functional overload. METHODS: In Study 1, 6-week-old ICR male mice were divided into 4 groups: sham-operated control, sham-operated EMIQ, overload-operated control, and overload-operated EMIQ groups...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28852372/branched-chain-amino-acids-and-muscle-protein-synthesis-in-humans-myth-or-reality
#6
REVIEW
Robert R Wolfe
The branched chain amino acids (BCAAs) are leucine, valine and isoleucine. A multi-million dollar industry of nutritional supplements has grown around the concept that dietary supplements of BCAAs alone produce an anabolic response in humans driven by a stimulation of muscle protein synthesis. In this brief review the theoretical and empirical bases for that claim are discussed. Theoretically, the maximal stimulation of muscle protein synthesis in the post-absorptive state in response to BCAAs alone is the difference between muscle protein breakdown and muscle protein synthesis (about 30% greater than synthesis), because the other EAAs required for synthesis of new protein can only be derived from muscle protein breakdown...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28811750/availability-of-a-sports-dietitian-may-lead-to-improved-performance-and-recovery-of-ncaa-division-i-baseball-athletes
#7
Michael V Hull, Jonathan Neddo, Andrew R Jagim, Jonathan M Oliver, Mike Greenwood, Margaret T Jones
BACKGROUND: The purpose was to survey dietary habits (DH) and nutrient timing (NT) practices of baseball student-athletes (mean ± SD; 20.7 ± 1.4 yr.) from three NCAA Division I institutions, and examine the effect of a sports dietitian (SD) in regard to nutrition practices. METHODS: Descriptive statistics and Pearson X(2) analyses were run. Responses on 10 DH and 5 NT items differed (p ≤ 0.10) between athletes who sought dietary planning from a SD (n = 36) versus those who consulted a strength and conditioning coach (SCC, n = 42)...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28811749/acute-cocoa-flavanols-intake-has-minimal-effects-on-exercise-induced-oxidative-stress-and-nitric-oxide-production-in-healthy-cyclists-a-randomized-controlled-trial
#8
Lieselot Decroix, Cajsa Tonoli, Danusa Dias Soares, Amandine Descat, Marie-José Drittij-Reijnders, Antje R Weseler, Aalt Bast, Wilhelm Stahl, Elsa Heyman, Romain Meeusen
BACKGROUND: Cocoa flavanols (CF) can stimulate vasodilation by improved nitric oxide (NO) synthesis and have antioxidant and anti-inflammatory capacities. This study aimed to examine whether acute CF intake can affect exercise-induced changes in antioxidant capacity, oxidative stress, inflammation and NO production, as well as exercise performance and recovery in well-trained cyclists. METHODS: Twelve well-trained male cyclists (mean ± SD age, VO2max: 30 ± 3 years, 63...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28811748/salivary-diagnostic-markers-in-males-and-females-during-rest-and-exercise
#9
Kay Rutherfurd-Markwick, Carlene Starck, Deborah K Dulson, Ajmol Ali
BACKGROUND: Saliva is a useful diagnostic tool for analysis in sports, exercise and nutrition research, as collection is easy and non-invasive and it contains a large number of analytes affected by a range of physiological and pathological stressors and conditions. This study examined key salivary electrolytes and stress and immune markers in males and females at rest and during exercise. METHODS: Unstimulated whole saliva from 20 healthy, recreationally active participants (8 males and 12 females) was analysed for flow rate, osmolality, sodium (Na(+)), potassium (K(+)), chloride (Cl(-)), secretory immunoglobulin A (SIgA), α-amylase activity and cortisol during both rest and moderate intensity (70% peak power) cycling exercise in a randomised crossover design...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28785177/the-nutrition-for-sport-knowledge-questionnaire-nskq-development-and-validation-using-classical-test-theory-and-rasch-analysis
#10
Gina Louise Trakman, Adrienne Forsyth, Russell Hoye, Regina Belski
BACKGROUND: Appropriate dietary intake can have a significant influence on athletic performance. There is a growing consensus on sports nutrition and professionals working with athletes often provide dietary education. However, due to the limitations of existing sports nutrition knowledge questionnaires, previous reports of athletes' nutrition knowledge may be inaccurate. METHODS: An updated questionnaire has been developed based on a recent review of sports nutrition guidelines...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28736511/effects-of-methylsulfonylmethane-msm-on-exercise-induced-oxidative-stress-muscle-damage-and-pain-following-a-half-marathon-a-double-blind-randomized-placebo-controlled-trial
#11
Eric D Withee, Kimberly M Tippens, Regina Dehen, Deanne Tibbitts, Douglas Hanes, Heather Zwickey
BACKGROUND: Oxidative stress and muscle damage occur during exhaustive bouts of exercise, and many runners report pain and soreness as major influences on changes or breaks in training regimens, creating a barrier to training persistence. Methylsulfonylmethane (MSM) is a sulfur-based nutritional supplement that is purported to have pain and inflammation-reducing effects. To investigate the effects of MSM in attenuating damage associated with physical exertion, this randomized, double-blind, placebo-controlled study evaluated the effects of MSM supplementation on exercise-induced pain, oxidative stress and muscle damage...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28717347/effect-of-eicosapentaenoic-acids-rich-fish-oil-supplementation-on-motor-nerve-function-after-eccentric-contractions
#12
Eisuke Ochi, Yosuke Tsuchiya, Kenichi Yanagimoto
BACKGROUND: This study investigated the effect of supplementation with fish oil rich in eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) on the M-wave latency of biceps brachii and muscle damage after a single session of maximal elbow flexor eccentric contractions (ECC). METHODS: Twenty-one men were completed the randomized, double-blind, placebo-controlled, and parallel-design study. The subjects were randomly assigned to the fish oil group (n = 10) or control group (n = 11)...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28706467/ketogenic-diet-benefits-body-composition-and-well-being-but-not-performance-in-a-pilot-case-study-of-new-zealand-endurance-athletes
#13
Caryn Zinn, Matthew Wood, Mikki Williden, Simon Chatterton, Ed Maunder
BACKGROUND: Low-carbohydrate, high-fat and ketogenic diets are increasingly adopted by athletes for body composition and sports performance enhancements. However, as yet, there is no consensus on their efficacy in improving performance. There is also no comprehensive literature on athletes' experiences while undertaking this diet. The purpose of this pilot work was two-fold: i. to examine the effects of a non-calorie controlled ketogenic diet on body composition and performance outcomes of endurance athletes, and ii...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28680370/effects-of-a-combined-protein-and-antioxidant-supplement-on-recovery-of-muscle-function-and-soreness-following-eccentric-exercise
#14
Stephen J Ives, Samuel Bloom, Alexs Matias, Noelle Morrow, Natalya Martins, Yookee Roh, Daniel Ebenstein, Gabriel O'Brien, Daniela Escudero, Kevin Brito, Leah Glickman, Scott Connelly, Paul J Arciero
BACKGROUND: An acute bout of eccentric contractions (ECC) cause muscle fiber damage, inflammation, impaired muscle function (MF) and muscle soreness (MS). Individually, protein (PRO) and antioxidant (AO) supplementation may improve some aspects of recovery from ECC, though have yet to be combined. We sought to determine if combined PRO and AO supplementation (PRO + AO) improves MS and MF following damaging ECC over PRO alone. METHODS: Sixty sedentary college-aged males participated in a randomized, single-blind, parallel design study of peak isometric torque (PIMT), peak isokinetic torque (PIKT), thigh circumference (TC), and muscle soreness (MS) of knee extensor muscles measured at baseline, immediately after and 1, 2, 6, and 24 h after completion of 100 maximal ECC...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28642676/international-society-of-sports-nutrition-position-stand-protein-and-exercise
#15
REVIEW
Ralf Jäger, Chad M Kerksick, Bill I Campbell, Paul J Cribb, Shawn D Wells, Tim M Skwiat, Martin Purpura, Tim N Ziegenfuss, Arny A Ferrando, Shawn M Arent, Abbie E Smith-Ryan, Jeffrey R Stout, Paul J Arciero, Michael J Ormsbee, Lem W Taylor, Colin D Wilborn, Doug S Kalman, Richard B Kreider, Darryn S Willoughby, Jay R Hoffman, Jamie L Krzykowski, Jose Antonio
The International Society of Sports Nutrition (ISSN) provides an objective and critical review related to the intake of protein for healthy, exercising individuals. Based on the current available literature, the position of the Society is as follows:An acute exercise stimulus, particularly resistance exercise, and protein ingestion both stimulate muscle protein synthesis (MPS) and are synergistic when protein consumption occurs before or after resistance exercise.For building muscle mass and for maintaining muscle mass through a positive muscle protein balance, an overall daily protein intake in the range of 1...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28630601/international-society-of-sports-nutrition-position-stand-diets-and-body-composition
#16
REVIEW
Alan A Aragon, Brad J Schoenfeld, Robert Wildman, Susan Kleiner, Trisha VanDusseldorp, Lem Taylor, Conrad P Earnest, Paul J Arciero, Colin Wilborn, Douglas S Kalman, Jeffrey R Stout, Darryn S Willoughby, Bill Campbell, Shawn M Arent, Laurent Bannock, Abbie E Smith-Ryan, Jose Antonio
Position Statement: The International Society of Sports Nutrition (ISSN) bases the following position stand on a critical analysis of the literature regarding the effects of diet types (macronutrient composition; eating styles) and their influence on body composition. The ISSN has concluded the following. 1) There is a multitude of diet types and eating styles, whereby numerous subtypes fall under each major dietary archetype. 2) All body composition assessment methods have strengths and limitations. 3) Diets primarily focused on fat loss are driven by a sustained caloric deficit...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28615997/serum-concentration-of-several-trace-metals-and-physical-training
#17
Marcos Maynar, Francisco Llerena, Francisco J Grijota, Javier Alves, María C Robles, Ignacio Bartolomé, Diego Muñoz
BACKGROUND: The aim of this study was to observe the concentrations of trace metals boron, lithium, rubidium, antimony, tin and strontium in the serum of athletes from different modalities and sedentary subjects and the possible influence that different energy sports training modalities can have on their concentration. METHODS: Eighty professional athletes and 31 sedentary males participated in the present survey. All of them were living in Cáceres (Spain). Serum boron, lithium, rubidium, antimony, tin and strontium analysis was performed by Inductively Coupled Plasma Mass Spectrometry (ICP-MS)...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28615996/international-society-of-sports-nutrition-position-stand-safety-and-efficacy-of-creatine-supplementation-in-exercise-sport-and-medicine
#18
REVIEW
Richard B Kreider, Douglas S Kalman, Jose Antonio, Tim N Ziegenfuss, Robert Wildman, Rick Collins, Darren G Candow, Susan M Kleiner, Anthony L Almada, Hector L Lopez
Creatine is one of the most popular nutritional ergogenic aids for athletes. Studies have consistently shown that creatine supplementation increases intramuscular creatine concentrations which may help explain the observed improvements in high intensity exercise performance leading to greater training adaptations. In addition to athletic and exercise improvement, research has shown that creatine supplementation may enhance post-exercise recovery, injury prevention, thermoregulation, rehabilitation, and concussion and/or spinal cord neuroprotection...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28603468/minimal-dose-of-milk-protein-concentrate-to-enhance-the-anabolic-signalling-response-to-a-single-bout-of-resistance-exercise-a-randomised-controlled-trial
#19
Cameron J Mitchell, Nina Zeng, Randall F D'Souza, Sarah M Mitchell, Kirsten Aasen, Aaron C Fanning, Sally D Poppitt, David Cameron-Smith
BACKGROUND: Resistance training is a potent stimulus to induce muscle hypertrophy. Supplemental protein intake is known to enhance gains in muscle mass through activation of the mammalian target of rapamycin complex 1 (mTORC1) pathway, which initiates protein translation. While the optimal dose of high quality protein to promote post exercise anabolism in young or older men has been investigated, little is known about the minimum doses of protein required to potentiate the resistance exercise activation of anabolic signalling in middle aged men...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28588427/evaluation-of-anti-fatigue-property-of-the-extruded-product-of-cereal-grains-mixed-with-cordyceps-militaris-on-mice
#20
Lei Zhong, Liyan Zhao, Fangmei Yang, Wenjian Yang, Yong Sun, Qiuhui Hu
BACKGROUND: Fatigue is a biological phenomenon that involves a feeling of extreme physical or mental tiredness that could potentially cause some severe chronic diseases. Recently, diet therapy has provided a new alternative to alleviate physical fatigue. In our previous study, addition of Cordyceps militaris (C. militaris) into an extruded product was shown to provide high nutrition and unique flavors; however, little is known whether this product has some scientific evidence regarding anti-fatigue property...
2017: Journal of the International Society of Sports Nutrition
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