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International Journal of Sport Nutrition and Exercise Metabolism

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https://www.readbyqxmd.com/read/29465269/evidence-based-supplements-for-the-enhancement-of-athletic-performance
#1
Peter Peeling, Martyn J Binnie, Paul S R Goods, Marc Sim, Louise M Burke
A strong foundation in physical conditioning and sport-specific experience, in addition to a bespoke and periodized training and nutrition program, are essential for athlete development. Once these underpinning factors are accounted for, and the athlete reaches a training maturity and competition level where marginal gains determine success, a role may exist for the use of evidence-based performance supplements. However, it is important that any decisions surrounding performance supplements are made in consideration of robust information that suggests the use of a product is safe, legal, and effective...
February 21, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29182451/protein-recommendations-for-weight-loss-in-elite-athletes-a-focus-on-body-composition-and-performance
#2
Amy J Hector, Stuart M Phillips
There exists a large body of scientific evidence to support protein intakes in excess of the recommended dietary allowance (RDA) (0.8 g protein/kg/day) to promote the retention of skeletal muscle and loss of adipose tissue during dietary energy restriction. Diet-induced weight loss with as low as possible ratio of skeletal muscle to fat mass loss is a situation we refer to as high-quality weight loss. We propose that high-quality weight loss is often of importance to elite athletes in order to maintain their muscle (engine) and shed unwanted fat mass, potentially improving athletic performance...
February 19, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29444595/dietary-supplements-and-the-high-performance-athlete
#3
Ronald Maughan
No abstract text is available yet for this article.
February 14, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29431539/male-flat-jockeys-do-not-display-deteriorations-in-bone-density-or-resting-metabolic-rate-in-accordance-with-race-riding-experience-implications-for-red-s
#4
George Wilson, Dan Martin, James P Morton, Graeme L Close
Despite consistent reports of poor bone health in male jockeys, it is not yet known if this is a consequence of low energy availability or lack of an osteogenic stimulus. Given the rationale that low energy availability is a contributing factor in low bone health, we tested the hypothesis that both hip and lumbar bone mineral density (BMD) should progressively worsen in accordance with the years of riding. In a cross-sectional design, male apprentice (n=17) and senior (n=14) jockeys (matched for body mass and fat free mass) were assessed for hip and lumbar spine BMD as well as both measured and predicted resting metabolic rate (RMR)...
February 12, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29431536/multi-day-pomegranate-extract-supplementation-decreases-oxygen-uptake-during-submaximal-cycling-exercise-but-co-supplementation-with-n-acetylcysteine-negates-the-effect
#5
Emma M Crum, Matthew J Barnes, Stephen R Stannard
Pomegranate extract (POMx) has been suggested as an ergogenic aid, due to its rich concentration of polyphenols, which are proposed to enhance nitric oxide (NO) bioavailability, thereby improving the efficiency of oxygen usage and consequently, endurance exercise performance. Although acute POMx supplementation improves aerobic exercise performance in untrained individuals, trained athletes appear to require chronic supplementation for a similar effect. Further, the combination of POMx with a thiol antioxidant may prove more effective than POMx alone, due to the protective effects of thiols on NO...
February 12, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29431535/differences-in-the-postprandial-release-of-appetite-related-hormones-between-active-and-inactive-men
#6
Linn Bøhler, Sílvia Ribeiro Coutinho, Jens F Rehfeld, Linda Morgan, Catia Martins
Active, as opposed to inactive, individuals are able to adjust their energy intake after preloads of different energy content. The mechanisms responsible for this remain unknown. This study examined differences in plasma concentration of appetite-related hormones in response to breakfasts of different energy content, between active and inactive men. 16 healthy non-obese (BMI 18.5-27 kg/m 2 ) adult males (9 active, 7 inactive), participated in the study. Participants were given a high- (HE, 570 kcal) or a low-energy (LE, 205 kcal) breakfast in random order...
February 12, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29431534/organisation-of-dietary-control-for-nutrition-training-intervention-involving-periodized-carbohydrate-cho-availability-and-ketogenic-low-cho-high-fat-lchf-diet
#7
Joanne G Mirtschin, Sara F Forbes, Louise E Cato, Ida A Heikura, Nicki Strobel, Rebecca Hall, Louise M Burke
We describe the implementation of a 3-week dietary intervention in elite race walkers at the Australian Institute of Sport, with a focus on the resources and strategies needed to accomplish a complex study of this scale. Interventions involved: traditional guidelines of high carbohydrate (CHO) availability for all training sessions (HCHO); a periodized CHO diet which integrated sessions with low CHO and high CHO availability within the same total CHO intake, and a ketogenic low-CHO high-fat diet (LCHF). 7-day menus and recipes were constructed for a communal eating setting to meet nutritional goals as well as individualized food preferences and special needs...
February 12, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29431521/effect-of-exercise-duration-on-subsequent-appetite-and-energy-intake-in-obese-adolescent-girls
#8
Julie Masurier, Marie-Eve Mathieu, S Nicole Fearnbach, Charlotte Cardenoux, Valérie Julian, Céline Lambert, Bruno Pereira, Martine Duclos, Yves Boirie, David Thivel
There is a growing interest regarding the effect of exercise on appetite and energy intake in youth. While the role of exercise intensity has been a primary focus of study, the effect of exercise duration on subsequent food intake has not been fully examined in obese adolescents. On three separate mornings in a randomly assigned order, obese adolescent girls (n=20) aged 12-15 years old were asked to perform a rest session (CON) or two cycling sessions for 20 (EX20) or 40 (EX40) minutes set at their ventilatory threshold...
February 12, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29405793/within-day-energy-deficiency-and-metabolic-perturbation-in-male-endurance-athletes
#9
Monica K Torstveit, Ida Fahrenholtz, Thomas B Stenqvist, Øystein Sylta, Anna Melin
Endurance athletes are at increased risk of relative energy deficiency associated with metabolic perturbation and impaired health. We aimed to estimate and compare within-day energy balance (WDEB) in male athletes with suppressed and normal resting metabolic rate (RMR) and explore if within-day energy deficiency (WDED) is associated with endocrine markers of energy deficiency. Thirty-one male cyclists, triathletes, and long-distance runners recruited from regional competitive sports clubs were included. The protocol comprised measurements of RMR by ventilated hood, and energy intake and energy expenditure to predict RMRratio (measured RMR/predicted RMR), energy availability (EA), 24-hour energy balance (EB) and WDEB in 1-hour intervals, assessment of body-composition by dual-energy X-ray absorptiometry, and blood plasma analysis...
February 6, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29405786/the-pre-competition-macronutrient-intake-of-elite-gaelic-football-players
#10
Cathal Cassidy, Kieran Collins, Marcus Shortall
Competition related dietary intake has not yet been investigated in Gaelic football. The present study examined the pre-competition macronutrient intake of elite male Gaelic football players. Forty players from two teams completed a food diary on the two days preceding competition (DAY-1 & DAY-2) and on match date pre-match (MATCH-DAY). Carbohydrate intake was significantly greater on DAY-2 compared to DAY-1, for both absolute [295 ± 98 vs. 318 ± 77 g] (p = 0.048; -23.6 g [-47.3 to 0.2]; Cohen's d = 0.27) and relative intake [3...
February 6, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29405782/low-rmrratio-as-a-surrogate-marker-for-energy-deficiency-the-choice-of-predictive-equation-vital-for-correctly-identifying-male-and-female-ballet-dancers-at-risk
#11
Sarah Staal, Anders Sjödin, Ida Fahrenholtz, Karen Bonnesen, Anna Melin
Ballet dancers are reported to have an increased risk for energy deficiency with or without disordered eating (DE) behavior. A low ratio between measured (m) and predicted (p) resting metabolic rate (RMRratio<0.90) is a recognized surrogate marker for energy deficiency. We aimed to evaluate the prevalence of suppressed RMR using different methods to calculate pRMR and to explore associations with additional markers of energy deficiency. Female (n=20) and male (n=20) professional ballet dancers, 19-35 years of age were enrolled...
February 6, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29405780/effects-of-high-vs-low-protein-intake-on-body-composition-and-maximal-strength-in-aspiring-female-physique-athletes-engaging-in-an-8-week-resistance-training-program
#12
Bill I Campbell, Danielle Aguilar, Laurin Conlin, Andres Vargas, Brad Jon Schoenfeld, Amey Corson, Chris Gai, Shiva Best, Elfego Galvan, Kaylee Couvillion
Aspiring female physique athletes are often encouraged to ingest relatively high levels of dietary protein in conjunction with their resistance-training programs. However, there is little to no research investigating higher vs. lower protein intakes in this population. This study examined the influence of a high vs. low protein diet in conjunction with an 8-week resistance training program in this population. Seventeen females (21.2±2.1 years; 165.1±5.1 cm; 61±6.1 kg) were randomly assigned to a high protein diet (HP: 2...
February 6, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29405779/caffeine-consumption-is-associated-with-higher-level-of-physical-activity-in-japanese-women
#13
Julien Tripette, Haruka Murakami, Hidemi Hara, Ryoko Kawakami, Yuko Gando, Harumi Ohno, Nobuyuki Miyatake, Motohiko Miyachi
Caffeine has been described as a sports performance-enhancing substance. However, it is unclear whether it can increase the level of physical activity in non-athletic individuals. This study investigates the relationship between daily caffeine consumption and (1) daily physical activity/fitness or (2) intervention-induced changes in physical activity in women and men. On the basis of responses to a dietary habit questionnaire, which included items on caffeinated beverages, 1032 Japanese adults, were categorized into lower- or higher-caffeine-consumption groups (relative to the median caffeine consumption)...
February 6, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29345213/matcha-green-tea-drinks-enhance-fat-oxidation-during-brisk-walking-in-females
#14
Mark Elisabeth Theodorus Willems, Mehmet Akif Şahin, Matthew David Cook
Intake of the catechin epigallocatechin gallate and caffeine has been shown to enhance exercise-induced fat oxidation. Matcha green tea powder contains catechins and caffeine and is consumed as a drink. We examined the effect of Matcha green tea drinks on metabolic, physiological and perceived intensity responses during brisk walking. Thirteen females (age: 27±8 yr, body mass: 65±7 kg, height: 166±6 cm) volunteered. Resting metabolic equivalent (1-MET) was measured using Douglas bags (1-MET: 3.4±0.3 ml·kg-1·min-1)...
January 18, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29345174/case-study-using-contemporary-behaviour-change-science-to-design-and-implement-an-effective-nutritional-intervention-within-professional-rugby-league
#15
Nessan Costello, Jim McKenna, Louise Sutton, Kevin Deighton, Ben Jones
Designing and implementing successful dietary intervention is integral to the role of sport nutrition professionals as they attempt to positively change the dietary behaviour of athletes. High-performance sport is a time-pressured environment where immediate results can often supersede pursuit of the most effective evidence-based practice. However, efficacious dietary intervention necessitates comprehensive, systematic and theoretical behavioural design and implementation if the habitual dietary behaviours of athletes are to be positively changed...
January 18, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29345173/effects-of-3-day-serial-sodium-bicarbonate-loading-on-performance-and-physiological-parameters-during-a-simulated-basketball-test-in-female-university-players
#16
Anne Delextrat, Sinead MacKessy, Luis Arceo-Rendon, Aaron Scanlan, Roger Ramsbottom, Julio Calleja-González
The aim of this study was to investigate the effect of 3-day serial sodium bicarbonate ingestion on repeated sprint and jump performance. Fifteen female university basketball players (23.3±3.4 years; 173.1±5.8 cm; 65.8±6.3 kg; 23.6±4.9% body fat) ingested 0.4 g·kg-1 of body mass of sodium bicarbonate or placebo for 3 days (split in 3 equal daily doses), before completing a simulated basketball exercise. Sprint and circuit times, jump heights, performance decrements and gastrointestinal (GI) side effects were recorded during the test and blood lactate concentration was measured pre- and post-test...
January 18, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29345171/comparison-of-bioelectrical-impedance-analysis-and-dual-energy-x-ray-absorptiometry-for-estimating-bone-mineral-content
#17
Tori M Stone, Jonathan E Wingo, Brett S Nickerson, Michael R Esco
The purpose of this study was to validate single-frequency hand-to-foot bioelectrical impedance analysis (HFBIA) for estimating bone mineral content (BMC) using dual energy X-ray absorptiometry (DXA) as the criterion measure in healthy, men and women aged 18-40 y. A total of 80 men and women participated. Bone mineral content was estimated on the same day using HFBIA and DXA. HFBIA device provided higher mean BMC values in men and the entire sample, but not in women. A smaller standard error of estimate was observed in women (0...
January 18, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29345167/dietary-supplements-for-health-adaptation-and-recovery-in-athletes
#18
Eric S Rawson, Mary P Miles, D Enette Larson-Meyer
Some dietary supplements are recommended to athletes based on data that supports improved exercise performance. Other dietary supplements are not ergogenic per se, but may improve health, adaptation to exercise, or recovery from injury, and so could help athletes to train and/or compete more effectively. In this review, we describe several dietary supplements that may improve health, exercise adaptation, or recovery. Creatine monohydrate may improve: recovery from and adaptation to intense training, recovery from periods of injury with extreme inactivity, cognitive processing, and reduce severity of or enhance recovery from mild traumatic brain injury (mTBI)...
January 18, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29345166/effects-of-coffee-components-on-muscle-glycogen-recovery-a-systematic-review
#19
Laís Monteiro Rodrigues Loureiro, Caio Eduardo Gonçalves Reis, Teresa Helena Macedo da Costa
Coffee is one of the most consumed beverages in the world and it can improve insulin sensitivity, stimulating glucose uptake in skeletal muscle when adequate carbohydrate intake is observed. The aim of this review is to analyze the effects of coffee and coffee components on muscle glycogen metabolism. A literature search was conducted according to PRISMA and seven studies were included. They explored the effects of coffee components on various substances and signaling proteins. In one of the studies with humans, caffeine was shown to increase glucose levels, Ca2+/calmodulin-dependent protein kinase (CaMK) phosphorylation, glycogen resynthesis rates and glycogen accumulation after exercise...
January 18, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29345161/caffeine-improves-triathlon-performance-a-field-study-in-males-and-females
#20
Sunita Potgieter, Hattie H Wright, Carine Smith
The ergogenic effect of caffeine on endurance exercise is commonly accepted. We aimed to elucidate realistically the effect of caffeine on triathlon event performance using a field study design, while allowing investigation into potential mechanisms at play. A double-blind, randomized, crossover, field trial was conducted. Twenty-six triathletes (14 males, 12 females) participated (age: 37.8±10.6 years, habitual caffeine intake: 413±505 mg/day, percentage body fat: 14.5±7.2%, training/week: 12.8±4.5 hours)...
January 18, 2018: International Journal of Sport Nutrition and Exercise Metabolism
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