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Erratum: Naclerio et al. (2017) Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-12-25
Journal Name: International Journal of Sport Nutrition and Exercise Metabolism Volume: 31 Issue: 1 Pages: 92-92
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Erratum: delli Paoli et al. (2020) Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-12-10
Journal Name: International Journal of Sport Nutrition and Exercise Metabolism Volume: 31 Issue: 1 Pages: 91-91
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Acknowledgments Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2021-12-29
Journal Name: International Journal of Sport Nutrition and Exercise Metabolism Volume: 31 Issue: 1 Pages: 90-90
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Inside the Belly of a Beast: Individualizing Nutrition for Young, Professional Male Rugby League Players: A Review Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-12-15 Vincent G. Kelly; Liam S. Oliver; Joanna Bowtell; David G. Jenkins
Professional rugby league (RL) football is a contact sport involving repeated collisions and high-intensity efforts; both training and competition involve high energy expenditure. The present review summarizes and critiques the available literature relating the physiological demands of RL to nutritional requirements and considers potential ergogenic supplements that could improve players’ physical
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No Effects of Different Doses of New Zealand Blackcurrant Extract on Cardiovascular Responses During Rest and Submaximal Exercise Across a Week in Trained Male Cyclists Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-11-12 Stefano Montanari; Mehmet A. Şahin; Ben J. Lee; Sam D. Blacker; Mark E.T. Willems
Supplementation with anthocyanin-rich blackcurrant increases blood flow, cardiac output, and stroke volume at rest. It is not known whether cardiovascular responses can be replicated over longer timeframes in fed trained cyclists. In a randomized, double-blind, crossover design, 13 male trained cyclists (age 39 ± 10 years, V˙O2max 55.3 ± 6.7 ml·kg−1·min−1) consumed two doses of New Zealand blackcurrant
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Short-Term Precision Error of Body Composition Assessment Methods in Resistance-Trained Male Athletes Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-11-12 Ava Farley; Gary J. Slater; Karen Hind
Athletic populations require high-precision body composition assessments to identify true change. Least significant change determines technical error via same-day consecutive tests but does not integrate biological variation, which is more relevant for longitudinal monitoring. The aim of this study was to assess biological variation using least significant change measures from body composition methods
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L-Arginine Improves Endurance to High-Intensity Interval Exercises in Overweight Men Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-12-01 Ali Daraei; Sajad Ahmadizad; Hiwa Rahmani; Anthony C. Hackney; Kelly E. Johnson; Ismail Laher; Ayoub Saeidi; Hassane Zouhal
The effects of acute consumption of L-Arginine (L-Arg) in healthy young individuals are not clearly defined, and no studies on the effects of L-Arg in individuals with abnormal body mass index undertaking strenuous exercise exist. Thus, we examined whether supplementation with L-Arg diminishes cardiopulmonary exercise testing responses, such as ventilation (VE), VE/VCO2, oxygen uptake (VO2), and heart
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Development of a “Cooling” Menthol Energy Gel for Endurance Athletes: Effect of Menthol Concentration on Acceptability and Preferences Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-11-27 Christopher J. Stevens; Megan L.R. Ross; Roxanne M. Vogel
Menthol is effective at stimulating thermosensitive neurons that evoke pleasant cooling sensations. Internal application of menthol can be ergogenic for athletes, and hence, addition of menthol to sports nutrition products may be beneficial for athletes. The aim of this study was to develop a menthol energy gel for consumption during exercise and to determine acceptability and preferences for gels
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Effects of Collagen Peptides on Recovery Following Eccentric Exercise in Resistance-Trained Males—A Pilot Study Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-11-12 Joel L. Prowting; Debra Bemben; Christopher D. Black; Eric A. Day; Jason A. Campbell
The authors sought to determine whether consuming collagen peptides (CP) enhances musculoskeletal recovery of connective tissues following a damaging exercise bout. Resistance-trained males consumed 15 g/day of CP (n = 7) or placebo (n = 8), and after 7 days, maximal voluntary isometric contraction (MVIC), countermovement jump height, soreness, and collagen turnover were examined. Five sets of 20 drop
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Inspiratory Muscle Training on Glucose Control in Diabetes: A Randomized Clinical Trial Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-11-27 Mariana B. Pinto; Patrícia M. Bock; Andressa S.O. Schein; Juliana Portes; Raíssa B. Monteiro; Beatriz D. Schaan
This study evaluated the effects of inspiratory muscle training (IMT) in glucose control and respiratory muscle function in patients with diabetes. It was a randomized clinical trial conducted at the Physiopathology Laboratory of the Hospital de Clínicas de Porto Alegre. Patients with Type 2 diabetes were randomly assigned to IMT or placebo-IMT (P-IMT), performed at 30% and 2% of maximal inspiratory
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Habitual Caffeine Consumption Does Not Affect the Ergogenicity of Coffee Ingestion During a 5 km Cycling Time Trial Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-12-01 Neil D. Clarke; Darren L. Richardson
There is growing evidence that caffeine and coffee ingestion prior to exercise provide similar ergogenic benefits. However, there has been a long-standing paradigm that habitual caffeine intake may influence the ergogenicity of caffeine supplementation. The aim of the present study was to investigate the effect of habitual caffeine intake on 5-km cycling time-trial performance following the ingestion
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Quinine Ingestion During the Latter Stages of a 3,000-m Time Trial Fails to Improve Cycling Performance Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-12-01 Naroa Etxebarria; Brad Clark; Megan L. Ross; Timothy Hui; Roland Goecke; Ben Rattray; Louise M. Burke
The ingestion of quinine, a bitter tastant, improves short-term (30 s) cycling performance, but it is unclear whether this effect can be integrated into the last effort of a longer race. The purpose of this study was to determine whether midtrial quinine ingestion improves 3,000-m cycling time-trial (TT) performance. Following three familiarization TTs, 12 well-trained male cyclists (mean ± SD: mass = 76
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Influence of Dietary Nitrate Supplementation on High-Intensity Intermittent Running Performance at Different Doses of Normobaric Hypoxia in Endurance-Trained Males Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-12-01 George P. Robinson; Sophie C. Killer; Zdravko Stoyanov; Harri Stephens; Luke Read; Lewis J. James; Stephen J. Bailey
This study investigated whether supplementation with nitrate-rich beetroot juice (BR) can improve high-intensity intermittent running performance in trained males in normoxia and different doses of normobaric hypoxia. Eight endurance-trained males (V˙O2peak, 62 ± 6 ml·kg−1·min−1) completed repeated 90 s intervals at 110% of peak treadmill velocity, from an initial step incremental test, interspersed
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Caffeinated Chewing Gum Improves Bicycle Motocross Time-Trial Performance. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-09-17 Amin Daneshfar,Carl J Petersen,Majid S Koozehchian,Daniel E Gahreman
This study aimed to identify the acute effects of caffeinated chewing gum (CAF) on bicycle motocross (BMX) time-trial (TT) performance. In a randomized, placebo-controlled, double-blind cross-over design, 14 male BMX riders (age = 20.0 ± 3.3 years; height = 1.78 ± 0.04 m; body mass = 72 ± 4 kg), consumed either (300 mg; 4.2 ± 0.2 mg/kg) caffeinated (300 mg caffeine, 6 g sugars) or a placebo (0 mg caffeine
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Effect of Dark Chocolate Supplementation on Tissue Oxygenation, Metabolism, and Performance in Trained Cyclists at Altitude. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-09-11 Keely Shaw,Jyotpal Singh,Luke Sirant,J Patrick Neary,Philip D Chilibeck
Dark chocolate (DC) is high in flavonoids and has been shown to increase nitric oxide in the blood. Increased nitric oxide has the potential to improve delivery of oxygen to muscle, especially in hypoxic conditions, such as altitude. Our aim was to assess the impact of DC supplementation on cycling performance at altitude. Twelve healthy, trained cyclists (n = 2 females, n = 10 males; age = 35 [12] years;
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Postprandial Metabolism and Vascular Function: Impact of Aging and Physical Activity Level. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-09-09 Nicholas A Koemel,Christina M Sciarrillo,Katherine B Bode,Madison D Dixon,Edralin A Lucas,Nathaniel D M Jenkins,Sam R Emerson
The consumption of a high-fat meal can induce postprandial lipemia and endothelial dysfunction. The authors assessed the impact of age and physical activity on metabolic and vascular outcomes following meal consumption in healthy adults. The authors recruited four groups: younger active (age 22.1 ± 1.4 years; n = 9), younger inactive (age 22.6 ± 3.7 years; n = 8), older active (age 68.4 ± 7.7 years;
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Creatine Supplementation Does Not Influence the Ratio Between Intracellular Water and Skeletal Muscle Mass in Resistance-Trained Men. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-09-11 Alex S Ribeiro,Ademar Avelar,Witalo Kassiano,João Pedro Nunes,Brad J Schoenfeld,Andreo F Aguiar,Michele C C Trindade,Analiza M Silva,Luís B Sardinha,Edilson S Cyrino
The authors aimed to compare the effects of creatine (Cr) supplementation combined with resistance training on skeletal muscle mass (SMM), total body water, intracellular water (ICW), and extracellular water (ECW) in resistance-trained men as well as to determine whether the SMM/ICW ratio changes in response to the use of this ergogenic aid. Twenty-seven resistance-trained men received either Cr (n = 14)
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Postexercise Inflammasome Activation and IL-1β Production Mitigated by Flavonoid Supplementation in Cyclists. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-09-15 David C Nieman,Francesca Ferrara,Alessandra Pecorelli,Brittany Woodby,Andrew T Hoyle,Andrew Simonson,Giuseppe Valacchi
Inflammasomes are multiprotein signaling platforms of the innate immune system that detect markers of physiological stress and promote the maturation of caspase-1 and interleukin 1 beta (IL-1β), IL-18, and gasdermin D. This randomized, cross-over trial investigated the influence of 2-week mixed flavonoid (FLAV) versus placebo (PL) supplementation on inflammasome activation and IL-1β and IL-18 production
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Short-Term, Combined Fasting and Exercise Improves Body Composition in Healthy Males Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-09-30 Giuseppe delli Paoli; Denise van de Laarschot; Edith C.H. Friesema; Remco Verkaik; Antonia Giacco; Rosalba Senese; Pascal P. Arp; P. Mila Jhamai; Stefano M. Pagnotta; Linda Broer; André G. Uitterlinden; Antonia Lanni; M. Carola Zillikens; Pieter de Lange
Fasting enhances the beneficial metabolic outcomes of exercise; however, it is unknown whether body composition is favorably modified on the short term. A baseline–follow-up study was carried out to assess the effect of an established protocol involving short-term combined exercise with fasting on body composition. One hundred seven recreationally exercising males underwent a 10-day intervention across
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Rank, Remit, and Resources. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-09-17 James A Betts
Journal Name: International Journal of Sport Nutrition and Exercise Metabolism Volume: 30 Issue: 6 Pages: 385-385
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Erratum: Campbell et al. 2018 Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-06-25
Journal Name: International Journal of Sport Nutrition and Exercise Metabolism Volume: 30 Issue: 5 Pages: 383-383
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Erratum: Sugihara Junior et al. 2018 Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-06-23
Journal Name: International Journal of Sport Nutrition and Exercise Metabolism Volume: 30 Issue: 5 Pages: 382-382
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A Tool to Explore Discrete-Time Data: The Time Series Response Analyser. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-07-29 Benjamin J Narang,Greg Atkinson,Javier T Gonzalez,James A Betts
The analysis of time series data is common in nutrition and metabolism research for quantifying the physiological responses to various stimuli. The reduction of many data from a time series into a summary statistic(s) can help quantify and communicate the overall response in a more straightforward way and in line with a specific hypothesis. Nevertheless, many summary statistics have been selected by
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The Effects of Caffeine Mouth Rinsing on Exercise Performance: A Systematic Review. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-07-15 Alex M Ehlert,Hannah M Twiddy,Patrick B Wilson
Caffeine ingestion can improve performance across a variety of exercise modalities but can also elicit negative side effects in some individuals. Thus, there is a growing interest in the use of caffeine mouth rinse solutions to improve sport and exercise performance while minimizing caffeine’s potentially adverse effects. Mouth rinse protocols involve swilling a solution within the oral cavity for
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Worth the Weight? Post Weigh-In Rapid Weight Gain is Not Related to Winning or Losing in Professional Mixed Martial Arts. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-07-08 Christopher Kirk,Carl Langan-Evans,James P Morton
Body mass (BM) manipulation via rapid weight loss (RWL) and rapid weight gain (RWG) is a common practice among mixed martial art (MMA) athletes to ensure qualification for the division in which the athlete wishes to compete. Professional MMA competitors in California are required to weigh in twice: 24 hr prior to competition and immediately prior to the bout after they have typically engaged in RWG
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Prevalence and Determinants of Fasted Training in Endurance Athletes: A Survey Analysis. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-07-23 Jeffrey A Rothschild,Andrew E Kilding,Daniel J Plews
Athletes may choose to perform exercise in the overnight-fasted state for a variety of reasons related to convenience, gut comfort, or augmenting the training response, but it is unclear how many endurance athletes use this strategy. We investigated the prevalence and determinants of exercise performed in the overnight-fasted state among endurance athletes using an online survey and examined differences
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Acute Consumption of Varied Doses of Cocoa Flavanols Does Not Influence Exercise-Induced Muscle Damage. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-07-08 Liam D Corr,Adam Field,Deborah Pufal,Jenny Killey,Tom Clifford,Liam D Harper,Robert J Naughton
Polyphenol consumption has become a popular method of trying to temper muscle damage. Cocoa flavanols (CF) have attracted attention due to their high polyphenol content and palatability. As such, this study will investigate whether an acute dose of CF can aid recovery following exercise-induced muscle damage. The study was a laboratory-based, randomized, single-blind, nutrient-controlled trial involving
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Sodium Bicarbonate Supplementation Does Not Improve Running Anaerobic Sprint Test Performance in Semiprofessional Adolescent Soccer Players. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-07-15 Rodrigo Dos Santos Guimarães,Alcides Correa de Morais Junior,Raquel Machado Schincaglia,Bryan Saunders,Gustavo Duarte Pimentel,João Felipe Mota
Ergogenic strategies have been studied to alleviate muscle fatigue and improve sports performance. Sodium bicarbonate (NaHCO3) has improved repeated sprint performance in adult team-sports players, but the effect for adolescents is unknown. The aim of the present study was to evaluate the effect of NaHCO3 supplementation on repeated sprint performance in semiprofessional adolescent soccer players.
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The Effects of a High-Protein Diet on Markers of Muscle Damage Following Exercise in Active Older Adults: A Randomized, Controlled Trial. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-07-21 Tom Clifford,Eleanor J Hayes,Jadine H Scragg,Guy Taylor,Kieran Smith,Kelly A Bowden Davies,Emma J Stevenson
Purpose: This study examined whether a higher protein diet following strenuous exercise can alter markers of muscle damage and inflammation in older adults. Methods: Using a double-blind, independent group design, 10 males and eight females (age 57 ± 4 years; mass 72.3 ± 5.6 kg; height 1.7 ± 6.5 m) were supplied with a higher protein (2.50 g·kg−1·day−1) or moderate protein (1.25 g·kg−1·day−1) diet
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High Prevalence of Cannabidiol Use Within Male Professional Rugby Union and League Players: A Quest for Pain Relief and Enhanced Recovery. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-07-30 Andreas M Kasper,S Andy Sparks,Matthew Hooks,Matthew Skeer,Benjamin Webb,Houman Nia,James P Morton,Graeme L Close
Rugby is characterized by frequent high-intensity collisions, resulting in muscle soreness. Players consequently seek strategies to reduce soreness and accelerate recovery, with an emerging method being cannabidiol (CBD), despite anti-doping risks. The prevalence and rationale for CBD use in rugby has not been explored; therefore, we recruited professional male players to complete a survey on CBD.
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Carbohydrate Hydrogel Products Do Not Improve Performance or Gastrointestinal Distress During Moderate-Intensity Endurance Exercise. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-07-23 Andy J King,Joshua T Rowe,Louise M Burke
The benefits of ingesting exogenous carbohydrate (CHO) during prolonged exercise performance are well established. A recent food technology innovation has seen sodium alginate and pectin included in solutions of multiple transportable CHO, to encapsulate them at pH levels found in the stomach. Marketing claims include enhanced gastric emptying and delivery of CHO to the muscle with less gastrointestinal
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Erratum: Anderson et al. (2019) Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-05-29
Journal Name: International Journal of Sport Nutrition and Exercise Metabolism Volume: 30 Issue: 4 Pages: 301-301
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No Differences Between Beetroot Juice and Placebo on Competitive 5-km Running Performance: A Double-Blind, Placebo-Controlled Trial. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-05-29 Philip Hurst,Samantha Saunders,Damian Coleman
The authors examine the effect of an acute dose of beetroot juice on endurance running performance in “real-world” competitive settings. In total, 70 recreational runners (mean ± SD: age = 33.3 ± 12.3 years, training history = 11.9 ± 8.1 years, and hours per week training = 5.9 ± 3.5) completed a quasi-randomized, double-blind, placebo-controlled study of 5-km competitive time trials. Participants
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No Effect of New Zealand Blackcurrant Extract on Recovery of Muscle Damage Following Running a Half-Marathon. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-05-29 Rianne Costello,Mark E T Willems,Stephen D Myers,Fiona Myers,Nathan A Lewis,Ben J Lee,Sam D Blacker
New Zealand blackcurrant (NZBC) contains anthocyanins, known to moderate blood flow and display anti-inflammatory properties that may improve recovery from exercise-induced muscle damage. The authors examined whether NZBC extract supplementation enhances recovery from exercise-induced muscle damage after a half-marathon race. Following a randomized, double-blind, independent groups design, 20 (eight
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Training Load and Carbohydrate Periodization Practices of Elite Male Australian Football Players: Evidence of Fueling for the Work Required. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-05-29 Harry E Routledge,Stuart Graham,Rocco Di Michele,Darren Burgess,Robert M Erskine,Graeme L Close,James P Morton
The authors aimed to quantify (a) the periodization of physical loading and daily carbohydrate (CHO) intake across an in-season weekly microcycle of Australian Football and (b) the quantity and source of CHO consumed during game play and training. Physical loading (via global positioning system technology) and daily CHO intake (via a combination of 24-hr recall, food diaries, and remote food photographic
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Adaptations in GLUT4 Expression in Response to Exercise Detraining Linked to Downregulation of Insulin-Dependent Pathways in Cardiac but not in Skeletal Muscle Tissue. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-05-25 Alexandre M Lehnen,Graziela H Pinto,Júlia Borges,Melissa M Markoski,Beatriz D Schaan
Insulin resistance is associated with cardiometabolic risk factors, and exercise training can improve insulin-mediated glucose uptake. However, few studies have demonstrated the reversibility of exercise-induced benefits. Thus, the authors examine the time–response effects of exercise training and detraining on glucose transporter 4 (GLUT4) content, insulin-dependent and insulin-independent pathways
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Normative Data for Sweat Rate and Whole-Body Sodium Concentration in Athletes Indigenous to Tropical Climate. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-05-25 Anita M Rivera-Brown,José R Quiñones-González
This study determined normative data for sweat rate (SR) and whole-body (WB) sweat sodium concentration [Na+] in athletes indigenous to a tropical climate, categorized by age, gender, and sport classification. We analyzed data from 556 athletes (386 adult and 170 young) in endurance (END), team/ball (TBA), and combat (COM) sports exercising in tropical environments (wet bulb globe temperature = 29
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New Zealand Blackcurrant Extract Enhances Muscle Oxygenation During Forearm Exercise in Intermediate-Level Rock Climbers. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-05-26 Simon Fryer,Craig Paterson,Ian C Perkins,Chris Gloster,Mark E T Willems,Julia A Potter
The delivery to and utilization of oxygenated hemoglobin to the forearm muscles are key determinants of rock-climbing performance. Anthocyanin-rich New Zealand blackcurrant (NZBC) has been suggested to improve blood flow and may enhance forearm endurance performance. As such, a double-blind, randomized crossover design study with 12 participants performed submaximal intermittent contractions (at 40%
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Metabolic Rate in Adolescent Athletes: The Development and Validation of New Equations, and Comparison to Previous Models. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-05-26 Reid J Reale,Timothy J Roberts,Khalil A Lee,Justina L Bonsignore,Melissa L Anderson
We sought to assess the accuracy of current or developing new prediction equations for resting metabolic rate (RMR) in adolescent athletes. RMR was assessed via indirect calorimetry, alongside known predictors (body composition via dual-energy X-ray absorptiometry, height, age, and sex) and hypothesized predictors (race and maturation status assessed via years to peak height velocity), in a diverse
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The Impact of a Dairy Milk Recovery Beverage on Bacterially Stimulated Neutrophil Function and Gastrointestinal Tolerance in Response to Hypohydration Inducing Exercise Stress. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-05-26 Ricardo J S Costa,Vera Camões-Costa,Rhiannon M J Snipe,David Dixon,Isabella Russo,Zoya Huschtscha
The study aimed to determine the impact of a dairy milk recovery beverage immediately after endurance exercise on leukocyte trafficking, neutrophil function, and gastrointestinal tolerance markers during recovery. Male runners (N = 11) completed two feeding trials in randomized order, after 2 hr of running at 70% V˙O2max, fluid restricted, in temperate conditions (25 °C, 43% relative humidity). Immediately
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Sweat Characteristics of Cramp-Prone and Cramp-Resistant Athletes. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-04-25 Kevin C Miller,Brendon P McDermott,Susan W Yeargin
Exercise-associated muscle cramps (EAMCs) are thought to be caused by dehydration and/or electrolyte losses. In this multicenter, cross-sectional study, the authors determined whether sweat rates (SRs), sweat electrolyte concentrations, or sweat electrolyte content differed in athletes with (i.e., crampers) and without (i.e., noncrampers) a history of EAMCs and whether these variables could predict
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Presleep α-Lactalbumin Consumption Does Not Improve Sleep Quality or Time-Trial Performance in Cyclists. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-04-23 Martin J MacInnis,Christine E Dziedzic,Emily Wood,Sara Y Oikawa,Stuart M Phillips
We tested the hypothesis that presleep consumption of α-lactalbumin (LA), a fraction of whey with a high abundance of tryptophan, would improve indices of sleep quality and time-trial (TT) performance in cyclists relative to an isonitrogenous collagen peptide (CP) supplement lacking tryptophan. Using randomized, double-blind, crossover designs, cyclists consumed either 40 g of LA or CP 2 hr prior to
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Reduced Glucose Tolerance and Skeletal Muscle GLUT4 and IRS1 Content in Cyclists Habituated to a Long-Term Low-Carbohydrate, High-Fat Diet. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-02-28 Christopher C Webster,Kathryn M van Boom,Nur Armino,Kate Larmuth,Timothy D Noakes,James A Smith,Tertius A Kohn
Very little is known about how long-term (>6 months) adaptation to a low-carbohydrate, high-fat (LCHF) diet affects insulin signaling in healthy, well-trained individuals. This study compared glucose tolerance; skeletal muscle glucose transporter 4 (GLUT4) and insulin receptor substrate 1 (IRS1) content; and muscle enzyme activities representative of the main energy pathways (3-hydroxyacetyl-CoA dehydrogenase
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Frequent Carbohydrate Ingestion Reduces Muscle Glycogen Depletion and Postpones Fatigue Relative to a Single Bolus. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-02-28 Campbell Menzies,Michael Wood,Joel Thomas,Aaron Hengist,Jean-Philippe Walhin,Robbie Jones,Kostas Tsintzas,Javier T Gonzalez,James A Betts
The timing of carbohydrate ingestion and how this influences net muscle glycogen utilization and fatigue has only been investigated in prolonged cycling. Past findings may not translate to running because each exercise mode is distinct both in the metabolic response to carbohydrate ingestion and in the practicalities of carbohydrate ingestion. To this end, a randomized, cross-over design was employed
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Case Study: Resumption of Eumenorrhea in Parallel With High Training Load After 4 Years of Menstrual Dysfunction: A 5-Year Follow-Up of an Elite Female Cyclist. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-02-27 José L Areta
The female athlete triad is a condition where low energy availability is typically observed together with menstrual dysfunction and/or low bone mineral density. How this condition affects maximal work capacity in endurance athletes is not clear, and the recovery time course of menses with increased energy availability with concomitant high training load is unknown. This case study of an amenorrheic
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Development of an Anthropometric Prediction Model for Fat-Free Mass and Muscle Mass in Elite Athletes. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-02-07 Erik Sesbreno,Gary Slater,Margo Mountjoy,Stuart D R Galloway
The monitoring of body composition is common in sports given the association with performance. Surface anthropometry is often preferred when monitoring changes for its convenience, practicality, and portability. However, anthropometry does not provide valid estimates of absolute lean tissue in elite athletes. The aim of this investigation was to develop anthropometric models for estimating fat-free
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GB Apprentice Jockeys Do Not Have the Body Composition to Make Current Minimum Race Weights: Is It Time to Change the Weights or Change the Jockeys? Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-02-07 George Wilson,Jerry Hill,Daniel Martin,James P Morton,Graeme L Close
Flat jockeys in Great Britain (GB) are classified as apprentices if they are aged less than 26 years and/or have ridden less than 95 winners. To gain experience, apprentices are allocated a weight allowance of up to 7 lb (3.2 kg). Given that there is no off-season in GB flat horseracing, jockeys are required to maintain their racing weight all year round. In light of recent work determining that current
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Endurance-Type Exercise Increases Bulk and Individual Mitochondrial Protein Synthesis Rates in Rats. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-02-07 Andrew M Holwerda,Freek G Bouwman,Miranda Nabben,Ping Wang,Janneau van Kranenburg,Annemie P Gijsen,Jatin G Burniston,Edwin C M Mariman,Luc J C van Loon
Physical activity increases muscle protein synthesis rates. However, the impact of exercise on the coordinated up- and/or downregulation of individual protein synthesis rates in skeletal muscle tissue remains unclear. The authors assessed the impact of exercise on mixed muscle, myofibrillar, and mitochondrial protein synthesis rates as well as individual protein synthesis rates in vivo in rats. Adult
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Impact of Exercise Timing on Chemosensory Response, Appetite, and Energy Intake in Lean Males. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-02-04 Kapria-Jad Josaphat,Vicky Drapeau,David Thivel,Marie-Eve Mathieu
BACKGROUND High-intensity exercise can have an anorectic impact, leading to negative energy balance. Several studies have reported that the practice of physical activity could also cause a shift in perceptions and preferences, causing a change in food intakes. OBJECTIVE This study aimed to question to what extent the timing of exercise in relation to a meal could have an impact on olfaction and gustation
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Perception of Carbohydrate Availability Augments High-Intensity Intermittent Exercise Capacity Under Sleep-Low, Train-Low Conditions. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-02-04 Sally P Waterworth,Connor C Spencer,Aaron L Porter,James P Morton
The authors tested the hypothesis that perception of carbohydrate (CHO) availability augments exercise capacity in conditions of reduced CHO availability. Nine males completed a sleep-low train model comprising evening glycogen-depleting cycling followed by an exhaustive cycling protocol the next morning in the fasted state (30 min steady state at 95% lactate threshold followed by 1-min intervals at
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Effects of Seasonal Vitamin D3 Supplementation on Strength, Power, and Body Composition in College Swimmers. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-02-04 Michelle S Rockwell,Madlyn I Frisard,Janet W Rankin,Jennifer S Zabinsky,Ryan P Mcmillan,Wen You,Kevin P Davy,Matthew W Hulver
The purpose of this study was to evaluate the impact of fall season vitamin D3 supplementation on strength/power, body composition, and anabolic hormones in swimmers with optimal vitamin D status at summer's end. Male and female National Collegiate Athletic Association Division I swimmers (N = 19) with optimal 25-hydroxyvitamin D [25(OH)D] randomly received 5,000 IU of vitamin D3 (VITD) or placebo
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PRESENT 2020: Text Expanding on the Checklist for Proper Reporting of Evidence in Sport and Exercise Nutrition Trials. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-01-15 James A Betts,Javier T Gonzalez,Louise M Burke,Graeme L Close,Ina Garthe,Lewis J James,Asker E Jeukendrup,James P Morton,David C Nieman,Peter Peeling,Stuart M Phillips,Trent Stellingwerff,Luc J C van Loon,Clyde Williams,Kathleen Woolf,Ron Maughan,Greg Atkinson
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Ringing the Changes in Sport Nutrition and Exercise Metabolism. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2020-01-15 James A Betts
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Enteric-Coated Sodium Bicarbonate Attenuates Gastrointestinal Side-Effects. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2019-11-22 Nathan Philip Hilton,Nicholas Keith Leach,Melissa May Craig,S Andy Sparks,Lars Robert McNaughton
Enteric-formulated capsules can mitigate gastrointestinal (GI) side effects following sodium bicarbonate (NaHCO3) ingestion; however, it remains unclear how encapsulation alters postingestion symptoms and acid-base balance. The current study aimed to identify the optimal ingestion form to mitigate GI distress following NaHCO3 ingestion. Trained males (n = 14) ingested 300 mg/kg body mass of NaHCO3
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Exogenous Ketone Salts Do Not Improve Cognitive Performance During a Dual-Stress Challenge. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2019-11-22 Hunter S Waldman,Brandon D Shepherd,Brendan Egan,Matthew J McAllister
In the present study, our team aimed to investigate the effects of acute ingestion of a ketone salt (KS) supplement on the cognitive performance in healthy college-aged males during a dual-stress challenge (DSC). Following a peak oxygen uptake test and DSC familiarization, 16 males completed a DSC while cycling at 60% of their respective peak oxygen uptake after ingesting either a commercially available
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Postexercise Glucose-Fructose Coingestion Augments Cycling Capacity During Short-Term and Overnight Recovery From Exhaustive Exercise, Compared With Isocaloric Glucose. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2019-11-13 Edward A Gray,Thomas A Green,James A Betts,Javier T Gonzalez
During short-term recovery, postexercise glucose-fructose coingestion can accelerate total glycogen repletion and augment recovery of running capacity. It is unknown if this advantage translates to cycling, or to a longer (e.g., overnight) recovery. Using two experiments, the present research investigated if postexercise glucose-fructose coingestion augments exercise capacity following 4-hr (short
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Combining Plant Sterols With Walking Lowers Postprandial Triacylglycerol More Than Walking Only in Chinese Men With Elevated Body Mass Index. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2019-11-01 Ching T Lye,Swarup Mukherjee,Stephen F Burns
This study examined if plant sterols and walking reduce postprandial triacylglycerol (TAG) concentrations in Chinese men with elevated body mass index (≥ 23.5 kg/m2). Fifteen Chinese men (mean [SD]: age = 25 [3] years and body mass index = 26.2 [1.5] kg/m2] completed four 10-day trials in random order with a 7- to 10-day washout between trials: (a) daily consumption of a control margarine while sedentary
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Influence of Periodizing Dietary Carbohydrate on Iron Regulation and Immune Function in Elite Triathletes. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2019-10-20 Alannah K A McKay,Ida A Heikura,Louise M Burke,Peter Peeling,David B Pyne,Rachel P L van Swelm,Coby M Laarakkers,Gregory R Cox
Sleeping with low carbohydrate (CHO) availability is a dietary strategy that may enhance training adaptation. However, the impact on an athlete's health is unclear. This study quantified the effect of a short-term "sleep-low" dietary intervention on markers of iron regulation and immune function in athletes. In a randomized, repeated-measures design, 11 elite triathletes completed two 4-day mixed cycle
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Basal Serum Cortisol and Testosterone/Cortisol Ratio Are Related to Rate of Na+ Lost During Exercise in Elite Soccer Players. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2019-10-20 Mauricio Castro-Sepulveda,Jorge Cancino,Rodrigo Fernández-Verdejo,Cristian Pérez-Luco,Sebastian Jannas-Vela,Rodrigo Ramirez-Campillo,Juan Del Coso,Hermann Zbinden-Foncea
During exercise, the human body maintains optimal body temperature through thermoregulatory sweating, which implies the loss of water, sodium (Na+), and other electrolytes. Sweat rate and sweat Na+ concentration show high interindividual variability, even in individuals exercising under similar conditions. Testosterone and cortisol may regulate sweat Na+ loss by modifying the expression/activity of
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Influence of Peak Menstrual Cycle Hormonal Changes on Restoration of Fluid Balance After Induced Dehydration. Int. J. Sport Nutr. Exerc. Metab. (IF 3.884) Pub Date : 2019-10-20 Paola Rodriguez-Giustiniani,Stuart D R Galloway
The present study examined the impact of hormonal differences between late follicular (LF) and midluteal (ML) phases on restoration of fluid balance following dehydration. Ten eumenorrheic female participants were dehydrated by 2% of their body mass through overnight fluid restriction followed by exercise-heat stress. Trials were undertaken during the LF (between Days 10 and 13 of the menstrual cycle)