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International Journal of Sport Nutrition and Exercise Metabolism

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https://www.readbyqxmd.com/read/29035603/competition-level-not-associated-with-diet-quality-in-marching-artists
#1
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
#2
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
https://www.readbyqxmd.com/read/29035601/skinfold-prediction-equations-fail-to-provide-an-accurate-estimate-of-body-composition-in-elite-rugby-union-athletes-of-caucasian-and-polynesian-ethnicity
#3
Adam Zemski, Elizabeth Broad, Gary Slater
Body composition in elite rugby union athletes is routinely assessed using surface anthropometry, which can be utilised to provide estimates of absolute body composition using regression equations. This study aims to assess the ability of available skinfold equations to estimate body composition in elite rugby union athletes, who have unique physique traits and divergent ethnicity. The development of sport-specific and ethnicity-sensitive equations was also pursued. Forty-three male international Australian rugby union athletes of Caucasian and Polynesian descent underwent surface anthropometry and dual-energy X-ray absorptiometry (DEXA) assessment...
October 16, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29035599/progressive-dehydration-in-junior-laser-class-sailors-during-world-championship
#4
Giannis Arnaoutis, Panagiotis Verginadis, Adam D Seal, Ioannis Vogiatzis, Labros S Sidossis, Stavros A Kavouras
The purpose of this manuscript is to assess hydration status of elite young sailing athletes during World Championship competition. 12 young elite male Laser Class sailors (age: 15.8±1.1 y, height: 1.74±0.1 m, weight: 65.1±1.5 kg, body fat: 12.5±3.1%, training experience: 7.0±1.2 y) participated in this descriptive study. After three-day baseline bodyweight measurements, hydration status was assessed via pre- and post-race body weights, urine specific gravity, and thirst ratings via a visual analog scale during 4 consecutive days of racing...
October 16, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29035597/influence-of-2-weeks-ingestion-of-high-chlorogenic-acid-coffee-on-mood-state-performance-and-post-exercise-inflammation-and-oxidative-stress-a-randomized-placebo-controlled-trial
#5
David C Nieman, Courtney L Goodman, Christopher R Capps, Zack L Shue, Robert Arnot
This study measured the influence of 2-weeks ingestion of high chlorogenic acid (CQA) coffee on post-exercise inflammation and oxidative stress, with secondary outcomes including performance and mood state. Cyclists (N=15) were randomized to CQA coffee or placebo (300 ml/day) for 2 weeks, participated in a 50-km cycling time trial, and then crossed over to the opposite condition with a 2-week washout period. Blood samples were collected pre- and post-supplementation, and immediately post-exercise. CQA coffee was prepared using the Turkish method with 30 g lightly roasted, highly ground Hambela coffee beans in 300 ml boiling water, and provided 1,066 mg CQA and 474 mg caffeine versus 187 mg CQA and 33 mg caffeine for placebo...
October 16, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28871893/metabolism-and-whole-body-fat-oxidation-following-post-exercise-carbohydrate-or-protein-intake
#6
Ulrika Andersson Hall, Stefan Pettersson, Fredrik Edin, Anders Pedersen, Daniel Malmodin, Klavs Madsen
PURPOSE: This study investigated how post-exercise intake of placebo (PLA), protein (PRO) or carbohydrate (CHO) affected fat oxidation (FO) and metabolic parameters during recovery and subsequent exercise. METHODS: In a cross-over design, 12 moderately trained women (VO2max 45 ± 6 ml·min(-1)·kg(-1)) performed three days of testing. A 23 min control (CON) incremental FO bike test (30-80% VO2max) was followed by 60 min exercise at 75% VO2max. Immediately post-exercise, subjects ingested PLA, 20 g PRO or 40 g CHO followed by a second FO bike test 2h later...
September 5, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28871851/reliability-and-precision-of-the-nana-protocol-to-assess-body-composition-using-dual-energy-x-ray-absorptiometry
#7
Flinn Shiel, Carl Persson, Vini Simas, James Furness, Mike Climstein, Rod Pope, Ben Schram
The Nana positioning protocol is widely used to position participants to minimise technical error when undertaking body composition scanning and analysis with a Dual Energy X-Ray Absorptiometry (DXA) machine. Once biological and technical errors are accounted for, the only variation in test re-test results is from statistical fluctuation or machine error. Therefore, the aim of this study is to assess the test re-test reliability of the Nana positioning protocol, and establish the smallest real difference percentage (SRD%)...
September 5, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28871849/resistance-training-combined-with-diet-decreases-body-fat-while-preserving-lean-mass-independent-of-resting-metabolic-rate-a-randomized-trial
#8
Todd Miller, Stephanie Mull, Alan Albert Aragon, James Krieger, Brad Jon Schoenfeld
The purpose of this study was to determine the effects of resistance training only (RT n=10), dietary intervention only (DIET n=10), resistance training plus diet (RT+DIET n=10) and control (CON n=10) on body composition and resting metabolic rate (RMR) in a cohort of 40 premenopausal female volunteers. Subjects in DIET and RT+DIET were provided with daily macronutrient and calorie goals based on DXA and RMR tests, with protein maintained at 1.4 g/kg/day. Subjects in the RT and RT+DIET groups performed a supervised progressive RT program consisting of exercises for all the major muscle groups of the body...
September 5, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28871847/single-nucleotide-polymorphisms-in-carnosinase-genes-cndp1-and-cndp2-are-associated-with-power-athletic-status
#9
João Paulo Limongi França Guilherme, Antonio Herbert Lancha Junior
Carnosine (β-alanyl-L-histidine), abundantly found in skeletal muscle, plays an important role during exercise, especially for high-intensity contractions. Variability in muscle carnosine content between individuals exists and may also be explained by different genetic bases, although no study has addressed the association of polymorphisms in genes related to carnosine metabolism in athletes. This study aimed to investigate the frequency of single nucleotide polymorphisms (SNPs) in the carnosinase genes (CNDP1 and CNDP2) in a large Brazilian cohort of athletes and non-athletes...
September 5, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28871837/sweat-sodium-concentration-inter-unit-variability-of-a-low-cost-portable-and-battery-operated-sodium-analyser
#10
Eric D B Goulet, Lindsay B Baker
The B-722 Laqua Twin is a low cost, portable and battery operated sodium analyser, which can be used for the assessment of sweat sodium concentration. The Laqua Twin is reliable and provides a degree of accuracy similar to more expensive analysers; however, its inter-unit measurement error remains unknown. The purpose of this study was to compare the sodium concentration values of 70 sweat samples measured using three different Laqua Twin units. Mean absolute errors, random errors and constant errors among the different Laqua Twins ranged respectively between 1...
September 5, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28871832/adding-fish-oil-to-whey-protein-leucine-and-carbohydrate-over-a-6-week-supplementation-period-attenuates-muscle-soreness-following-eccentric-exercise-in-competitive-soccer-players
#11
Jordan D Philpott, Chris Donnelly, Ian H Walshe, James Dick, Stuart D R Galloway, Kevin D Tipton, Oliver C Witard
Soccer players often experience eccentric exercise-induced muscle damage given the physical demands of soccer match-play. Since long chain n-3 polyunsaturated fatty acids (n-3PUFA) enhance muscle sensitivity to protein supplementation, dietary supplementation with a combination of fish oil-derived n-3PUFA, protein and carbohydrate may promote exercise recovery. This study examined the influence of adding n-3PUFA to a whey protein, leucine and carbohydrate containing beverage over a 6 week supplementation period on physiological markers of recovery measured over 3 days following eccentric exercise...
September 5, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28787220/selection-of-a-thoracic-gas-volume-when-using-air-displacement-plethysmography-to-assess-longitudinal-body-composition-changes
#12
Patrick B Wilson
No abstract text is available yet for this article.
August 8, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28787184/validity-of-four-compartment-model-body-fat-in-physically-active-men-and-women-when-using-dxa-for-body-volume
#13
Brett S Nickerson, Michael R Esco, Phillip A Bishop, Brian M Kliszczewicz, Kyung-Shin Park, Henry N Williford
The purpose of this study was twofold: 1) compare body volume (BV) estimated from dual energy X-ray absorptiometry (DXA) to BV from a criterion underwater weighing (UWW) with simultaneous residual lung volume (RLV), and 2) compare four-compartment (4C) model body fat percentage (BF%) values when deriving BV via DXA (4CDXA) and UWW (4CUWW) in physically active men and women. One hundred twenty-two adults (62 men and 60 women) who self-reported physical activity levels of at least 1,000 MET·min·wk(-1) volunteered to participate (age=22±5 years)...
August 8, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28787178/androgen-bioassay-for-the-detection-of-non-labeled-androgenic-compounds-in-nutritional-supplements
#14
Elliot R Cooper, Kristine C Y McGrath, XiaoHong Li, Alison K Heather
Both athletes and the general population use nutritional supplements. Athletes often turn to supplements hoping that consuming the supplement will help them be more competitive and healthy while the general population hopes to improve body image or vitality. While many supplements contain ingredients that may have useful properties, there are supplements that are contaminated with compounds that are banned for use in sport or have been deliberately adulterated to fortify a supplement with an ingredient that will produce the advertised effect...
August 8, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28771066/estimates-of-energy-intake-and-expenditure-in-elite-female-touch-players-during-an-international-tournament
#15
Nicola Marsh, Nick Dobbin, Craig Twist, Chris Curtis
This study assessed energy intake and expenditure of international female Touch players during an international tournament. Energy intake (food diary) and expenditure (accelerometer, global positioning system) were recorded for 16 female Touch players during a four-day tournament, competing in 8.0 ± 1.0 matches; two on days one, two and four, and three on day three. Total daily energy expenditure (43.6 ± 3.1 Kcal·kg(-1) body mass (BM)) was not different (P > 0.05) from energy intake (39.9 ± 9.4 Kcal·kg(-1) BM)...
August 3, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28771064/vitamin-d3-supplementation-does-not-improve-sprint-performance-in-professional-rugby-players-a-randomised-placebo-controlled-double-blind-intervention-study
#16
Kirsty A Fairbairn, Ingrid Jm Ceelen, C Murray Skeaff, Claire M Cameron, Tracy L Perry
Vitamin D insufficiency is common in athletes and may lower physical performance. Many cross-sectional studies associate vitamin D status with physical performance in athletes, however there have been few prospective randomised controlled trials with adequate statistical power to test this relationship, and none in the southern hemisphere. Thus, a prospective double blind, randomised placebo-controlled intervention trial was conducted, involving 57 professional rugby union players in New Zealand. Participants were randomised to receive 50,000 IU of cholecalciferol (equivalent to 3,570 IU/day) or placebo once every two weeks over 11-12 weeks...
August 3, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28770669/case-study-unfavorable-but-transient-physiological-changes-during-contest-preparation-in-a-drug-free-male-bodybuilder
#17
Andrew Pardue, Eric T Trexler, Lisa K Sprod
Extreme body composition demands of competitive bodybuilding have been associated with unfavorable physiological changes, including alterations in metabolic rate and endocrine profile. The current case study evaluated the effects of contest preparation (8 months), followed by recovery (5 months), on a competitive drug-free male bodybuilder over 13 months (M1-M13). Serum testosterone, triiodothyronine (T3), thyroxine (T4), cortisol, leptin, and ghrelin were measured throughout the study. Body composition (BodPod, dual-energy x-ray absorptiometry [DXA]), anaerobic power (Wingate test), and resting metabolic rate (RMR) were assessed monthly...
August 3, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28770634/an-international-comparison-of-nutrition-education-standards-occupational-standards-and-scopes-of-practice-for-personal-trainers
#18
Katelyn Barnes, Lauren Ball, Ben Desbrow
Personal trainers are well placed to provide nutrition care in line with their recommended scope of practice. However, providing nutrition care beyond their recommended scope of practice has been identified as an industry risk. The International Confederation of Registers for Exercise Professionals (ICREPs) have international standards for nutrition knowledge and skills that are recommended for all fitness professionals, including personal trainers. This study investigates whether the ICREPs standards align with i) national nutrition education standards and ii) national nutrition occupational standards and scopes of practice for personal trainers within ICREPs affiliated countries...
August 3, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28719251/erratum-ijsnem-27-3
#19
(no author information available yet)
The International Journal of Sport Nutrition and Exercise Metabolism 27(3), http://journals.humankinetics.com/toc/ijsnem/27/3 , was incorrectly paginated. The correct page range for this issue is 197-292. The online versions of these articles have been corrected.
August 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28388288/athlete-information-sources-about-dietary-supplements-a-review-of-extant-research
#20
Bryan E Denham
In the United States, the Dietary Supplement Health and Education Act of 1994 (DSHEA) classified dietary supplements as a subcategory of food, exempting manufacturers from providing premarket evidence of product safety and efficacy. Under DSHEA, agencies such as the U.S. Food and Drug Administration (FDA) cannot inspect supplements until after the products have entered the marketplace. Recognizing that both limited resources and DSHEA prevent the FDA from conducting broad-based inspections on a regular basis, disreputable manufacturers have spiked products with drugs such as anabolic steroids and amphetamines...
August 2017: International Journal of Sport Nutrition and Exercise Metabolism
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