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International Journal of Sport Nutrition and Exercise Metabolism

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https://www.readbyqxmd.com/read/28787220/selection-of-a-thoracic-gas-volume-when-using-air-displacement-plethysmography-to-assess-longitudinal-body-composition-changes
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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/28657805/daily-distribution-of-macronutrient-intakes-of-professional-soccer-players-from-the-english-premier-league
#8
Liam Anderson, Robert J Naughton, Graeme L Close, Rocco Di Michele, Ryland Morgans, Barry Drust, James P Morton
The daily distribution of macronutrient intake can modulate aspects of training adaptations, performance and recovery. We therefore assessed the daily distribution of macronutrient intake (as assessed using food diaries supported by the remote food photographic method and 24 h recalls) of professional soccer players (n=6) of the English Premier League during a 7-day period consisting of two match days and five training days. On match days, average carbohydrate (CHO) content of the pre-match (<1.5 g.kg(-1) body mass) and post-match (1 g...
June 28, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28657803/effects-of-aerobic-strength-or-combined-exercise-on-perceived-appetite-and-appetite-related-hormones-in-inactive-middle-aged-men
#9
Penelope S Larsen, Cheyne E Donges, Kym J Guelfi, Greg C Smith, David R Adams, Rob Duffield
Aerobic exercise (AE) and strength exercise (SE) are reported to induce discrete and specific appetite-related responses; however, the effect of combining AE and SE (i.e. combined exercise; CE) remains relatively unknown. Twelve inactive overweight men (age: 48 ± 5 y; BMI: 29.9 ± 1.9 kg·m(2)) completed four conditions in a random order: 1) non-exercise control (CON) (50 min seated rest); 2) AE (50 min cycling; 75% VO2peak); 3) SE (10 × 8 leg extensions; 75% 1RM); and 4) CE (50% SE + 50% AE). Perceived appetite, and appetite-related peptides and metabolites were assessed prior to and up to 2 h post-condition (0P, 30P, 60P, 90P, 120P)...
June 28, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28556690/vitamin-d-status-and-muscle-function-among-adolescent-and-young-swimmers
#10
Nina Rica Wium Geiker, Rikke Larsen, Mette Hansen, Niklas R Jørgensen, Jette Jakobsen, Birthe S Hansen, Michael Kristensen, Susanne Bügel
Impaired muscle function has been coupled to vitamin D insufficiency in young women and in elderly men and women. Those living at Northern latitudes are at risk of vitamin D insufficiency due to low sun exposure which may be more pronounced among elite swimmers because of their indoor training schedules. We aimed to examine vitamin D status among young elite swimmers and evaluate the association between vitamin D status and muscle strength. Twenty-nine swimmers, 12 female and 17 male (16-24 years) residing at latitude 55-56°N were studied in March and April...
May 30, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28556673/markers-of-bone-health-bone-specific-physical-activities-nutritional-intake-and-quality-of-life-of-professional-jockeys-in-hong-kong
#11
Eric Tsz-Chun Poon, John O'Reilly, Sinead Sheridan, Michelle Mingjing Cai, Stephen Heung-Sang Wong
Weight-making practices regularly engaged in by horse racing jockeys have been suggested to impair both physiological and mental health. This study aimed to assess bone health markers, nutritional intake, bone-specific physical activity habits and quality of life of professional jockeys in Hong Kong (n = 14), with gender-, age- and BMI-matched controls (n = 14). Anthropometric measurements, serum hormonal biomarkers, bone mineral density (BMD), bone-specific physical activity habits, nutritional intake, and quality of life (QOL) were assessed in all participants...
May 30, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28719251/erratum-ijsnem-27-3
#12
(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
#13
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
https://www.readbyqxmd.com/read/28387576/dietary-microperiodization-in-elite-female-and-male-runners-and-race-walkers-during-a-block-of-high-intensity-precompetition-training
#14
Ida A Heikura, Louise M Burke, Antti A Mero, Arja Leena Tuulia Uusitalo, Trent Stellingwerff
We investigated one week of dietary microperiodization in elite female (n = 23) and male (n = 15) runners and race-walkers by examining the frequency of training sessions and recovery periods conducted with recommended carbohydrate (CHO) and protein availability. Food and training diaries were recorded in relation to HARD (intense or >90min sessions; KEY) versus RECOVERY days (other-than KEY sessions; EASY). The targets for amount and timing of CHO and protein around KEY sessions were based on current nutrition recommendations...
August 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28387575/nutritional-considerations-for-bouldering
#15
Edward J Smith, Ryan Storey, Mayur K Ranchordas
Bouldering competitions are held up to International level and governed by the International Federation of Sport Climbing. Bouldering has been selected to feature at the 2020 Olympic Games in Tokyo, however, physiological qualities and nutritional requirements to optimize performance remain inadequately defined due to large gaps in the literature. The primary goals of training include optimizing the capacity of the anaerobic energy systems and developing sport-specific strength, with emphasis on the isometric function of the forearm flexors responsible for grip...
August 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28387540/n-3-fatty-acid-supplementation-during-4-weeks-of-training-leads-to-improved-anaerobic-endurance-capacity-but-not-maximal-strength-speed-or-power-in-soccer-players
#16
Leyre Gravina, Frankie F Brown, Lee Alexander, James Dick, Gordon Bell, Oliver C Witard, Stuart D R Galloway
Omega-3 fatty acid (n-3 FA) supplementation could promote adaptation to soccer-specific training. We examined the impact of a 4-week period of n-3 FA supplementation during training on adaptations in 1RM knee extensor strength, 20-m sprint speed, vertical jump power, and anaerobic endurance capacity (Yo-Yo test) in competitive soccer players. Twenty six soccer players were randomly assigned to one of two groups: n-3 FA supplementation (n-3 FA; n = 13) or placebo (n = 13). Both groups performed two experimental trial days...
August 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28338369/dha-rich-fish-oil-increases-the-omega-3-index-and-lowers-the-oxygen-cost-of-physiologically-stressful-cycling-in-trained-individuals
#17
Lachlan Hingley, Michael J Macartney, Marc A Brown, Peter L McLennan, Gregory E Peoples
Dietary fish oil, providing docosahexaenoic acid (DHA) modulates oxygen consumption and fatigue in animal models. However, in humans predominately supplemented with high eicosapentaenoic acid (EPA), there is no evidence of endurance performance enhancement. Therefore, this study examined if DHA-rich fish oil could improve repeated bouts of physiologically stressful cycling and a subsequent time trial in a state of fatigue. Twenty-six trained males took part in a double-blind study and were supplemented with either 2 × 1g/day soy oil, Control) or DHA-rich tuna fish oil (Nu-Mega) (FO) (560mg DHA / 140mg eicosapentaenoic acid (EPA), for 8 weeks...
August 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28338358/a-mismatch-between-athlete-practice-and-current-sports-nutrition-guidelines-among-elite-female-and-male-middle-and-long-distance-athletes
#18
Ida A Heikura, Trent Stellingwerff, Antti A Mero, Arja Leena Tuulia Uusitalo, Louise M Burke
Contemporary nutrition guidelines promote a variety of periodized and time-sensitive recommendations, but current information regarding the knowledge and practice of these strategies among world-class athletes is limited. The aim of this study was to investigate this theme by implementing a questionnaire on dietary periodization practices in national/international level female (n = 27) and male (n = 21) middle- and long-distance runners/race-walkers. The questionnaire aimed to gain information on between and within-day dietary choices, as well as timing of pre- and posttraining meals and practices of training with low or high carbohydrate (CHO) availability...
August 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28253039/frequency-of-chronic-gastrointestinal-distress-in-runners-validity-and-reliability-of-a-retrospective-questionnaire
#19
Patrick B Wilson
Gastrointestinal (GI) symptoms may affect up to 90% of competitors during endurance races. Studies have typically assessed GI symptoms retrospectively or only over an acute timeframe, and information on the validity and reliability of the questionnaires employed is lacking. This investigation aimed to estimate the frequency of GI distress experienced by runners over 30 days and to establish the validity and reliability of a retrospective GI symptom questionnaire. Runners (70 men, 75 women) recorded GI symptoms with a prospective journal for 30 days...
August 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28253032/validation-of-a-single-question-for-the-evaluation-of-physical-activity-in-adolescents
#20
Alexandre Magalhães, Milton Severo, Roseanne Autran, Joana Araújo, Paula Santos, Maria Fátima Pina, Elisabete Ramos
We aimed to assess the validity of a single question to evaluate leisure-time physical activity (PA) in adolescents. We included 209 participants (57.4% girls) aged 14-18 years from Porto, Portugal, evaluated as part of the SALTA project. A self-reported question with four answer options, designed for the EPITeen study, was used to classify the intensity level of usual leisure-time activities. Actigraph accelerometers were used to objectively measure total PA during 7 consecutive days. Since the accelerometers measured PA as a continuous variable, hierarchical cluster analysis was used to identify clusters of individuals with similar level of objectively measured PA...
August 2017: International Journal of Sport Nutrition and Exercise Metabolism
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