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International Journal of Sport Nutrition and Exercise Metabolism

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https://www.readbyqxmd.com/read/29182451/protein-recommendations-for-weight-loss-in-elite-athletes-a-focus-on-body-composition-and-performance
#1
Amy Hector, Stuart M Phillips
There exists a large body of scientific evidence to support protein intakes in excess of the recommended dietary allowance (RDA) (0.8g protein/kg/d) 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...
November 28, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29182412/the-effect-of-water-loading-on-acute-weight-loss-following-fluid-restriction-in-combat-sports-athletes
#2
Reid Reale, Gary Slater, Ian C Dunican, Gregory R Cox, Louise M Burke
Novel methods of acute weight loss practiced by combat sport athletes include 'water loading’; the consumption of large fluid volumes for several days prior to restriction. We examined claims this technique increases total body water losses, while also assessing the risk of hyponatremia. Male athletes were separated into control (CON, n=10) and water loading (WL, n=11) groups and fed a standardised energy-matched diet for 6 days. Day 1-3 fluid intake was 40 mL·kg-1 and 100 mL·kg-1 for CON and WL, respectively with both groups consuming 15 mL·kg-1on Day 4 and following the same rehydration protocol on Days 5-6...
November 28, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29182403/long-distance-triathletes-intentions-to-manipulate-energy-and-macronutrient-intake-over-a-training-macrocycle
#3
Hani Kopetschny, David Rowlands, David Popovich, Jasmine Thomson
This study explored the information sources long-distance triathletes used to inform their training and nutrition plans, and evaluated these plans over a training macrocycle. Seventy-four long-distance triathletes completed the online survey. Coaches were the most popular training information source (69%), whereas non-professional sources (internet 65%, other athletes 53%) were more popular than nutritionists (29%) for nutrition information. Attributes valued most in an information source were: source prior personal experience, individualised advice, breadth of knowledge, and credibility...
November 28, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29140157/case-study-body-composition-periodization-in-an-olympic-level-female-middle-distance-runner-over-a-9-year-career
#4
Trent Stellingwerff
This case-study features an Olympic-level female middle-distance runner implementing a science-based approach to body composition periodization. Data is emerging to suggest that it is not sustainable from a health and/or performance perspective to be at peak body composition year-round, so body composition needs to be strategically periodized. Anthropometric (n=44), hematological, other health measures and 1500m race performances (n=83) were periodically assessed throughout a 9-year career. General preparation phase (September to April) featured the athlete at ~2 to 4% over ideal competition phase body weight (BW) and body fat (%) with optimal energy availability being prioritized...
November 15, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29140154/no-difference-in-young-adult-athletes-resting-energy-expenditure-when-measured-under-inpatient-or-outpatient-conditions
#5
Julia L Bone, Louise M Burke
Low energy availability can place athletes at increased risk of injury and illness and can be detected by a low metabolic rate. The lowest metabolic rate is captured at the bedside, after an overnight fast and termed inpatient REE. Measurements done in a laboratory with a shorter overnight fast are termed outpatient REE. Although important to know what the lowest energy expenditure, a bedside measure and/or 12 h fast is not always practical or logistically possible particularly when you take into account an athlete's training schedule...
November 15, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29140151/a-comparison-of-the-nutrient-intakes-of-macronutrient-based-dieting-and-strict-dieting-bodybuilders
#6
Ahmed Ismaeel, Suzy Weems, Darryn Willoughby
The purpose of this study was to provide a descriptive assessment of the nutritional habits of competitive bodybuilders and compare the nutrient intakes of macronutrient-based dieting and strict dieting individuals. Data from 41 subjects (30 males and 11 females) were used in analyses. Participants completed a comprehensive food frequency questionnaire and diets were analyzed using a computer system. Males consumed an average of 2577.2 (SD=955.1) kilocalories, with an average fat intake of 83.6 g (SD=41.3), an average carbohydrate intake of 323...
November 15, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29140146/awareness-and-attitude-towards-use-of-dietary-supplements-and-the-perceived-outcomes-among-saudi-adult-male-members-of-fitness-centers-in-saudi-arabia
#7
Hanan A Alfawaz, Soundararajan Krishnaswamy, Latifah Al-Faifi, Halima Ali Bin Atta, Mohammad Al-Shayaa, Saad A Alghanim, Nasser M Al-Daghri
Dietary supplements are believed to enhance athletic performance and/or prevent/reverse pathological states. Despite the increasing use of dietary supplements in Saudi Arabia, systematic studies in this field are lacking. This study aims to assess the relation between demographic and social characteristics and dietary supplement use among adult males in Saudi Arabia. Demographic and dietary supplements data from fitness club participants were collected through a questionnaire and Pearson Chi-square test was used to determine associations...
November 15, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29140143/sweat-sodium-potassium-and-chloride-concentrations-analyzed-same-day-as-collection-versus-after-seven-days-storage-in-a-range-of-temperatures
#8
Lindsay B Baker, Kelly A Barnes, Bridget C Sopeña, Ryan P Nuccio, Adam J Reimel, Corey T Ungaro
The purpose of this study was to determine the effect of storage temperature on sodium ([Na(+)]), potassium ([K(+)]), and chloride ([Cl(-)]) concentrations of sweat samples analyzed seven days after collection. Using the absorbent patch technique, 845 sweat samples were collected from 39 subjects (32±7 y, 72.9±10.5 kg) during exercise. On the same day as collection (PRE-STORAGE), 609 samples were analyzed for [Na(+)], [Cl(-)], and [K(+)] via ion chromatography (IC) and 236 samples were analyzed for [Na(+)] using a compact ion-selective electrode (ISE)...
November 15, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29140140/the-physiological-mechanisms-of-effect-of-vitamins-and-amino-acids-on-tendon-and-muscle-healing-a-systematic-review
#9
Christopher Tack, Faye Shorthouse, Lindsy Kass
AIMS/OBJECTIVES: To evaluate current literature via systematic review to ascertain whether amino acids/ vitamins provide any influence on musculotendinous healing, and by which physiological mechanisms Methods: EBSCO, PUBMED, Science Direct, Embase Classic/ Embase, and MEDLINE were searched using terms including "vitamins", "amino acids", "healing", "muscle" and "tendon". The primary search had 479 citations, 466 of which were excluded predominantly due to non-randomised design. Randomised human and animal studies investigating all supplement types/ forms of administration were included...
November 15, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29140136/salt-glycerol-induced-hyperhydration-enhances-fluid-retention-more-than-salt-or-glycerol-induced-hyperhydration
#10
Eric D B Goulet, Adrien De La Flore, Félix A Savoie, Jonathan Gosselin
Hyperhydration has been demonstrated to improve work capacity and cardiovascular and thermoregulatory functions, enhance orthostatic tolerance, slow or neutralize bone demineralization and decrease post-dive bubble formation. Adding sodium or glycerol to a hyperhydration solution optimizes fluid retention. Sodium and glycerol produce their effect through different physiological mechanisms. If combined into a hyperhydration solution their impact on fluid retention could potentially be greater than their singular effect...
November 15, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29140134/a-nutrition-recovery-station-following-recreational-exercise-improves-fruit-consumption-but-does-not-influence-fluid-recovery
#11
Ben Desbrow, Katelyn Barnes, Caroline Young, Gregory R Cox, Chris Irwin
Immediate post-exercise access to fruit/fluid via a recovery "station" is a common feature of mass participation sporting events. Yet little evidence exists examining their impact on subsequent dietary intake. The aim of this study was to determine if access to fruit/water/sports drinks within a recovery station significantly alters dietary and fluid intakes in the immediate post-exercise period and influences hydration status the next morning. 127 (79 males) healthy participants (mean±SD, age=22.5±3.5y, body mass (BM)=73±13kg) completed two self-paced morning 10km runs separated by 1 week...
November 15, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29091479/case-study-the-effect-of-nutritional-intervention-on-body-composition-and-physical-performance-of-a-female-squash-player
#12
Christopher Rosimus
The body composition of a squash player may affect athletic performance as carrying excessive body fat may increase injury risk and impair agility and speed. This case study outlines the effect of a nutritional intervention on body composition, vitamin D status and physical performance of a female squash player. A structured, 6-week moderate energy-restricted diet (70-78% of Estimated Energy Requirement (EER) of 2300 kcal was implemented with weekly support. A daily supplement of vitamin D, omega 3 fatty acids, and a multivitamin/multimineral and whey protein was used...
November 1, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29091476/brief-education-intervention-increases-nutrition-knowledge-and-confidence-of-coaches-of-junior-australian-football-teams
#13
Regina Belski, Alex Donaldson, Kiera Staley, Anne Skiadopoulos, Erica Randle, Paul O'Halloran, Pam Kappelides, Steve Teakel, Sonya Stanley, Matthew Nicholson
This study evaluated the impact of a brief (20-minute) nutrition education intervention embedded in an existing mandatory coach education course for coaches of junior (8-12 year old) Australian football teams. Two hundred and eighty-four coaches (68% of 415 coaching course participants) completed a pre-session questionnaire and 110 (27% of coaching course participants) completed an identical post-session questionnaire. The responses to the pre- and post-session surveys were matched for 78 coaches. Coaches' ratings of their own understanding of the nutritional needs of young athletes (6...
November 1, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29091471/the-effect-of-a-dietary-nitrate-supplementation-in-the-form-of-a-single-shot-of-beetroot-juice-on-static-and-dynamic-apnoea-performance
#14
Matthew J Barlow, Antonis Elia, Oliver M Shannon, Angeliki Zacharogianni, Angelica Lodin-Sundstrom
INTRODUCTION: The purpose of the present study was to assess the effects of acute nitrate (NO3(-))-rich beetroot juice supplementation on peripheral oxygen saturation (SpO2), heart rate (HR), and pulmonary gas exchange during submaximal static and dynamic apnoea. METHODS: Nine (six male, three female) trained apneists (age: 39.6 ± 8.2 years, stature: 170.4 ± 11.5cm, body mass: 72.0 ± 11.5 kg) performed three submaximal static apnoeas at 60%, 70% and 80% of the participant's current reported personal best time, followed by three submaximal (~ 75% or personal best distance) dynamic apnoeas following the consumption of either a 140 ml concentrated NO3(-)-rich beetroot juice (BRJ; 7...
November 1, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29091470/acute-ingestion-of-caffeinated-chewing-gum-improves-repeated-sprint-performance-of-team-sports-athletes-with-low-habitual-caffeine-consumption
#15
Mark Evans, Peter Tierney, Nicola Gray, Greg Hawe, Maria Macken, Brendan Egan
The effects of acute ingestion of caffeine on short-duration high intensity performance are equivocal, while studies of novel modes of delivery and the efficacy of low doses of caffeine are warranted. The aims of the present study were to investigate the effect of acute ingestion of caffeinated chewing gum on repeated sprint performance (RSP) in team sport athletes, and whether habitual caffeine consumption alters the ergogenic effect, if any, on RSP. Eighteen male team sports athletes undertook four RSP trials using a 40 m maximum shuttle run test (MST), which incorporates 10x40 m sprints with 30 s between the start of each sprint...
November 1, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29091469/case-study-dose-response-of-caffeine-on-20-km-handcycling-time-trial-performance-in-a-para-triathlete
#16
Terri Graham-Paulson, Claudio Perret, Victoria Goosey-Tolfrey
Caffeine's ability to influence upper-body exercise (UBE) endurance performance may be related to an individual's training status. This case study therefore aimed to investigate the ergogenic effects of caffeine dose on 20 km time trial (TT) performance of an elite male Para-triathlete (wheelchair user) (age 46 y, body mass 76.9 kg, body fat 25.4%, handcycling V̇O2peak 3.45 l·min(-1)). The athlete completed four 20 km handcycling TT's on a Cyclus II ergometer under laboratory controlled conditions following the ingestion of 2, 4 and 6 mg·kg(-1) caffeine (CAF) or placebo (PLA)...
November 1, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29091468/the-effect-of-mode-of-transport-on-intra-individual-variability-in-glycaemic-and-insulinaemic-response-testing
#17
Alaaddine El-Chab, Miriam Clegg
The effect of light to moderate intensity exercise, such as that used as a mode of transport, on glycaemic response (GR) testing is unclear. The aim was to investigate the effect of acute exercise (walking and cycling) simulated to act as a mode of transport, prior to GR testing on the intra-individual variability of blood glucose and insulin. Eleven male participants visited the laboratory four times. Initially they undertook a VO2max and two submaximal exercise tests. For the other three visits they either rested (25 min), cycled or walked 5km followed by a two hour GR test after consuming a glucose drink (50g available carbohydrate)...
November 1, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29091464/effect-of-four-weeks-ingestion-of-tomato-based-carotenoids-on-exercise-induced-inflammation-muscle-damage-and-oxidative-stress-in-endurance-runners
#18
David C Nieman, Courtney L Capps, Christopher R Capps, Zack L Shue, Jennifer E McBride
This double blind, randomized, placebo controlled crossover trial determined if ingestion of a supplement containing a tomato extract with 11 mg lycopene, phytoene, and phytofluene (T-LPP) for 4 weeks would attenuate inflammation, muscle damage, and oxidative stress post-exercise and during recovery from a 2-h running bout that included 30 minutes of -10% downhill running. Study participants ingested the T-LPP supplement or placebo with the evening meal for 4 weeks prior to running 2 h at high intensity. Blood samples and delayed-onset of muscle soreness (DOMS) ratings were taken pre- and post-4-weeks supplementation, and immediately following the 2-h run, and then 1-h-, 24-h-, and 48-h post-run...
November 1, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29035603/competition-level-not-associated-with-diet-quality-in-marching-artists
#19
Colleen R McConnell, Alyssa McPherson, Kathleen Woolf
Marching artists are a unique group of athletes whose performance can be influenced by nutrition. Because physical demands are thought to be moderate to high, adequate energy and a variety of nutrient-dense foods are needed. The purpose of this study was to examine diet quality, physical activity, and eating behavior of marching artists across elite and non-elite competition levels. This cross-sectional analysis used the validated National Cancer Institute Diet History Questionnaire II, International Physical Activity Questionnaire, and Eating Behavior Patterns Questionnaire...
October 16, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29035602/effect-of-pre-exercise-ingestion-of-modified-amylomaize-starch-on-glycemic-response-while-cycling
#20
Rachel B Parks, Hector F Angus, Douglas S King, Rick Sharp
Amylomaize-7 is classified as a resistant corn starch and is 68% digestible. When modified by partial hydrolysis in ethanol and hydrochloric acid, its digestibility is 92%, yet retains its low glycemic and insulinemic properties. The purpose of this study was to characterize the metabolic response when modified amylomaize-7 or dextrose is consumed in the hour before exercise, and to compare the effect on performance of a brief high-intensity cycling trial. Ten male trained cyclists were given 1 g/kg body mass of dextrose (DEX) or modified amylomaize-7 (AMY-7) or a flavored water placebo (PL) 45 min prior to exercise on a cycle ergometer...
October 16, 2017: International Journal of Sport Nutrition and Exercise Metabolism
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