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International Journal of Sport Nutrition and Exercise Metabolism

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https://www.readbyqxmd.com/read/29485323/the-effect-of-1-week-of-a-multi-ingredient-dietary-preworkout-supplement-on-resting-and-postacute-resistance-exercise-vascular-function
#1
Austin T Robinson, Adriana Mazzuco, Ahmad S Sabbahi, Audrey Borghi-Silva, Shane A Phillips
Dietary preworkout supplements are popular among recreational exercisers and athletes. However, the effects of these supplements on the vasculature, both at rest and during exercise, are not well studied. Therefore, the purpose of this study was to determine the effect of 1 week of supplementation with a multi-ingredient dietary preworkout supplement on measures of vascular function at rest and immediately following acute resistance exercise in young, recreationally active adults. Twelve participants (9 males and 3 females; mean ± SD: age = 24...
September 13, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29893586/case-study-fatal-exertional-rhabdomyolysis-possibly-related-to-drastic-weight-cutting
#2
Kadhiresan R Murugappan, Michael N Cocchi, Somnath Bose, Sara E Neves, Charles H Cook, Todd Sarge, Shahzad Shaefi, Akiva Leibowitz
Rapid weight loss or "weight cutting" is a dangerous practice that is ubiquitous in modern combat sports yet underrepresented in the medical literature. We present a case of exertional rhabdomyolysis in a mixed martial artist with sickle cell trait to illustrate the hazards of weight cutting and ensuing critical illness. Sickle cell trait is known to predispose patients to exertional rhabdomyolysis, and multiple fatal cases have been reported in the setting of strenuous exercise. Dehydration and consequent electrolyte abnormalities make combat sport athletes with sickle cell trait particularly vulnerable to this entity...
September 11, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29485324/protein-supplementation-during-a-6-month-concurrent-training-program-effect-on-body-composition-and-muscular-strength-in-sedentary-individuals
#3
Michael J Ormsbee, Brandon D Willingham, Tasha Marchant, Teresa L Binkley, Bonny L Specker, Matthew D Vukovich
We examined the effect of a protein supplement on muscular strength and body composition during 6 months of a 5 days/week concurrent strength and endurance training program. Sedentary males (n = 26) and females (n = 25), 18-25 years, were randomly assigned to receive a protein (PRO, 42 g/serving) or carbohydrate (CON) supplement twice daily. Strength and body composition (dual-energy X-ray absorptiometry) were assessed at baseline, 3 (3M), and 6 (6M) months. Protein intake was higher in PRO (PRO: 2...
September 11, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29722586/australian-football-athletes-lack-awareness-of-current-sport-nutrition-guidelines
#4
Gina L Trakman, Adrienne Forsyth, Kane Middleton, Russell Hoye, Sarah Jenner, Stephen Keenan, Regina Belski
Sports nutrition is an evolving field, but there is a lack of data on Australian athletes' knowledge of current sports nutrition guidelines. Additionally, several tools used to assess nutrition knowledge (NK) have not undergone adequate validation. The purpose of this study was to assess and compare the sports NK of elite and nonelite Australian football (AF) athletes using a newly validated questionnaire-The Nutrition for Sport Knowledge Questionnaire. Elite AF players (n = 46) were recruited directly from their club dietitian and nonelite AF players (n = 53) were invited to participate via e-mail from their club president or secretary...
September 9, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29757043/effect-of-vitamin-d-supplementation-on-25-oh-d-status-in-elite-athletes-with-spinal-cord-injury
#5
Kelly Pritchett, Robert C Pritchett, Lauren Stark, Elizabeth Broad, Melissa LaCroix
Recent studies suggest that a substantial proportion of athletes with spinal cord injury have insufficient 25(OH) vitamin D (25(OH)D) status, which may be associated with decreased muscle strength. This study consisted of two parts: (a) to examine the effects of a 12- to 16-week vitamin D3 supplementation protocol on 25(OH)D concentration and (b) to determine whether subsequent 25(OH)D status impacts muscle performance in elite athletes with spinal cord injury. Thirty-four members (age: 33 ± 15 years, weight: 69...
September 8, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/30180759/dubious-and-fraudulent-activities-in-sports-nutrition
#6
Ronald J Maughan
No abstract text is available yet for this article.
September 4, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29584462/effects-of-caffeinated-gum-on-a-battery-of-soccer-specific-tests-in-trained-university-standard-male-soccer-players
#7
Mayur K Ranchordas, George King, Mitchell Russell, Anthony Lynn, Mark Russell
The purpose of this study was to determine whether caffeinated gum influenced performance in a battery of soccer-specific tests used in the assessment of performance in soccer players. In a double-blind, randomized, crossover design, 10 male university-standard soccer players (age: 19 ± 1 years, stature: 1.80 ± 0.10 m, body mass: 75.5 ± 4.8 kg) masticated a caffeinated (200 mg; caffeine) or control (0 mg; placebo) gum on two separate occasions. After a standardized warm-up, gum was chewed for 5 min and subsequently expectorated 5 min before players performed a maximal countermovement jump, a 20-m sprint test, and the Yo-Yo Intermittent Recovery Test Level 1...
September 3, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/30160565/dietary-anthocyanins-a-review-of-the-exercise-performance-effects-and-related-physiological-responses
#8
Matthew David Cook, Mark Elisabeth Theodorus Willems
Foods and supplements high in anthocyanins are gaining popularity within sports nutrition. Anthocyanins are pigments within berries and other colourful fruits and vegetables. They have anti-oxidative and anti-inflammatory actions that improve recovery from exercise. Furthermore, anthocyanins can also affect vasoactive properties, including decreasing mean arterial blood pressure and increasing vasodilation during exercise. In vitro observations have shown anthocyanin- and metabolite-induced activation of endothelial nitric oxide synthase and human vascular cell migration...
August 30, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/30160564/increasing-exercise-intensity-increases-glucose-uptake-in-human-bone-marrow
#9
Ilkka Heinonen, Jukka Kemppainen, Toshihiko Fujimoto, Juhani Knuuti, Kari K Kalliokoski
Human bone marrow is a metabolically active tissue that responds to acute low intensity exercise by having increased glucose uptake. Here we studied whether bone marrow glucose uptake increases more with increased exercise intensities. Femoral bone marrow glucose uptake was measured using positron emission tomography and 18 F-fluoro-deoxyglucose in six healthy young men during cycling at intensities of 30% (LOW), 55% (MODERATE), and 75% (HIGH) of maximal oxygen consumption on three separate days. Bone marrow glucose uptake at LOW was 17...
August 30, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/30160556/social-media-as-a-nutrition-resource-for-athletes-a-cross-sectional-survey
#10
Bridget Ellen Philippa Bourke, Dane Francis Baker, Andrea Jane Braakhuis
Social media contains a wealth of nutrition information and proposes a cost-effective, highly engaging platform to deliver nutrition information to athletes. This study used an online questionnaire to determine whether New Zealand athletes are using social media as a source of nutrition information, and to understand perceptions of social media as a nutrition resource. Quantitative data was analysed using t-tests, chi-square tests and logistic regression analysis. Inductive thematic analysis was adopted for the qualitative data...
August 30, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/30160554/case-study-long-term-low-carbohydrate-high-fat-diet-impairs-performance-and-subjective-wellbeing-in-a-world-class-vegetarian-long-distance-triathlete
#11
Iñigo Mujika
The aim of this case study was to report on the performance outcomes and subjective assessments of long-term low carbohydrate, high fat (LCHF) diet in a world-class long-distance triathlete who had been suffering from GI distress in Ironman competition. The lacto-ovo vegetarian athlete (age 39 y; height 179 cm; usual racing body mass 75 kg, sum of 7 skinfolds 36 mm) changed his usual high CHO availability (HCHO) diet to a LCHF diet for 32 weeks (~95% compliance). He participated in 3 professional races while on the LCHF diet, but acutely restored CHO availability by consuming CHO in the pre-event meals and during the race as advised...
August 30, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/30160551/exclusion-of-trunk-region-reduces-biological-error-but-increases-technical-error-of-dxa-lean-soft-tissue-estimates-from-non-fasted-assessments
#12
Grant M Tinsley, Brett S Nickerson
Implementation of an overnight fast is a pervasive recommendation prior to body composition assessment, but this is not always feasible. Previous research has indicated that, for dual-energy x-ray absorptiometry (DXA) scans, the trunk region may be particularly susceptible to biological error induced by food and fluid intake. This analysis explored the potential utility of excluding the trunk region from non-fasted DXA scans. Recreationally active adults were assessed by DXA after an overnight fast and again after consumption of standardized high-carbohydrate (HC) and low-carbohydrate (LC) diets...
August 30, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/30160550/energy-deficiency-during-cold-weather-mountain-training-in-nsw-seal-qualification-students
#13
Kim Beals, Katherine A Perlsweig, John E Haubenstriker, Mita Lovalekar, Chris P Beck, Darcie L Yount, Matthew E Darnell, Katelyn Allison, Bradley C Nindl
Special Operation Forces (SOF) participating in Mountain Warfare/Cold Weather (MWCW) training have higher energy demands, but adequate fueling is difficult to achieve. The purpose of the study was to determine energy expenditure relative to energy intake and examine fueling patterns during 3 days of MWCW training in Naval Special Warfare SEAL Qualification Training (SQT) Students. Ten SQT Students (age: 23.3±1.8yrs, height: 182.3±6.4 cm, weight: 83.6±4.5 kg) were fitted for heart rate and accelerometer monitors during MWCW training...
August 30, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/30160549/associations-of-25-hydroxyvitamin-d-with-the-blood-pressure-response-to-maximal-exercise-among-healthy-adults
#14
Amanda Zaleski, Beth Taylor, Braden Armstrong, Michael Puglisi, Priscilla Clarkson, Stuart Chipkin, Charles Michael White, Paul D Thompson, Linda S Pescatello
Insufficient 25-hydroxyvitamin D [(25(OH)D)] levels are associated with high resting blood pressure (BP). However, the relationship between 25(OH)D and the peak systolic BP (SBP) response to exercise, a predictor of future hypertension, has yet to be investigated. We sought to examine the relationship among serum 25(OH)D and the peak SBP response to a graded exercise stress test (GEST) among a large sample (n=417) of healthy men (49%) and women (51%) over a broad age range (20-76 yr; mean age 44.1±0.8y). We hypothesized that individuals with clinically insufficient 25(OH)D would have a greater peak SBP response to a GEST compared to individuals with sufficient 25(OH)D levels...
August 30, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/30160545/accurate-prediction-equation-to-assess-body-fat-in-male-and-female-adolescent-football-players
#15
Gabriel Lozano-Berges, Ángel Matute-Llorente, Alejandro Gómez-Bruton, Alejandro González-Agüero, Germán Vicente-Rodríguez, José A Casajús
The aims of this study were (a) to determine which of the most used anthropometric equations was the most accurate to estimate percentage of body fat (%BF), (b) to develop a new specific anthropometric equation, and (c) to validate this football-specific equation. A total of 126 (13.3±0.6 y) football players (86 males) participated in the present study. Participants were divided into two groups: 98 players were included in the assessment of existing equations and in the development of the new prediction equation; and 28 were used to validate it...
August 30, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29757049/prevalence-of-indicators-of-low-energy-availability-in-elite-female-sprinters
#16
Jennifer Sygo, Alexandra M Coates, Erik Sesbreno, Margo L Mountjoy, Jamie F Burr
Low energy availability (LEA), and subsequent relative energy deficiency in sport, has been observed in endurance, aesthetic, and team sport athletes, with limited data on prevalence in athletes in short-burst activities such as sprinting. We examined prevalence of signs and symptoms of LEA in elite female sprinters at the start of the training season (PRE), and at the end of a 5-month indoor training period (POST). Four of 13 female sprinters (31%) presented at PRE testing with at least one primary (amenorrhea, low bone mineral density, low follicle-stimulating hormone, luteinizing hormone, or estradiol, resting metabolic rate ≤29 kcal/kg fat-free mass, Low Energy Availability in Females Questionnaire score ≥8) and one secondary indicator of LEA (fasting blood glucose <4 mmol/L, free triiodothyronine <3...
August 17, 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
#17
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 contents. 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 contents, between active and inactive men. Sixteen healthy nonobese (body mass index = 18.5-27 kg/m2 ) adult males (nine active and seven inactive) participated in this study. Participants were given a high-energy (570 kcal) or a low-energy (205 kcal) breakfast in a random order...
August 3, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29485339/macronutrient-intakes-of-male-rugby-union-players-a-review
#18
Katherine Elizabeth Black, Alistair David Black, Dane Frances Baker
Rugby is a worldwide intermittent team sport. Players tend to be heavier than the majority of similar team sport athletes on whom the dietary guidelines have been developed. Therefore, the aim of the current review was to describe the intakes of rugby union players. Article databases were searched up to February 2017 and were included if they were published in English and reported dietary intakes of male rugby union players. Of the research articles identified, energy intakes were lower than two of three studies that reported intakes and expenditure, which would suggest the players were losing weight that is somewhat supported by the decreases in skinfolds seen during preseason...
August 1, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29431536/multiday-pomegranate-extract-supplementation-decreases-oxygen-uptake-during-submaximal-cycling-exercise-but-cosupplementation-with-n-acetylcysteine-negates-the-effect
#19
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 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. Furthermore, the combination of POMx with a thiol antioxidant may prove more effective than POMx alone, due to the protective effects of thiols on nitric oxide...
August 1, 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
#20
Julie Masurier, Marie-Eve Mathieu, Stephanie 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 (control, CON) or two cycling sessions for 20 (EX20) or 40 min (EX40) set at their ventilatory threshold...
August 1, 2018: International Journal of Sport Nutrition and Exercise Metabolism
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