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International Journal of Sport Nutrition and Exercise Metabolism

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https://read.qxmd.com/read/30975001/rapid-weight-loss-in-competitive-judo-and-taekwondo-athletes-attitudes-and-practices-of-coaches-and-trainers
#1
Ben-El Berkovich, Aliza H Stark, Alon Eliakim, Dan Nemet, Tali Sinai
Fasting, skipping meals, and dehydration are common methods of rapid weight loss used prior to competition in weight category sports. This study examines coaches' attitudes, perceptions, and practices regarding rapid weight loss among judo and taekwondo athletes. A convenience sample of experienced coaches and trainers (n = 68) completed structured questionnaires. Participants in this study were 33.8 ± 9.3 years old; 57 were males and 11 were females; and 59% were certified coaches, with 71% reporting over 20 years of involvement in sports and 68% having more than 10 years of teaching experience...
April 11, 2019: International Journal of Sport Nutrition and Exercise Metabolism
https://read.qxmd.com/read/30952204/international-association-of-athletics-federations-consensus-statement-2019-nutrition-for-athletics
#2
Louise M Burke, Linda M Castell, Douglas J Casa, Graeme L Close, Ricardo J S Costa, Ben Desbrow, Shona L Halson, Dana M Lis, Anna K Melin, Peter Peeling, Philo U Saunders, Gary J Slater, Jennifer Sygo, Oliver C Witard, Stéphane Bermon, Trent Stellingwerff
The International Association of Athletics Federations recognizes the importance of nutritional practices in optimizing an Athlete's well-being and performance. Although Athletics encompasses a diverse range of track-and-field events with different performance determinants, there are common goals around nutritional support for adaptation to training, optimal performance for key events, and reducing the risk of injury and illness. Periodized guidelines can be provided for the appropriate type, amount, and timing of intake of food and fluids to promote optimal health and performance across different scenarios of training and competition...
April 5, 2019: International Journal of Sport Nutrition and Exercise Metabolism
https://read.qxmd.com/read/30943836/fluid-needs-for-training-competition-and-recovery-in-track-and-field-athletes
#3
Douglas J Casa, Samuel N Cheuvront, Stuart D Galloway, Susan M Shirreffs
The 2019 International Amateur Athletics Federation Track-and-Field World Championships will take place in Qatar in the Middle East. The 2020 Summer Olympics will take place in Tokyo, Japan. It is quite likely that these events may set the record for hottest competitions in the recorded history of both the Track-and-Field World Championships and Olympic Games. Given the extreme heat in which track-and-field athletes will need to train and compete for these games, the importance of hydration is amplified more than in previous years...
April 4, 2019: International Journal of Sport Nutrition and Exercise Metabolism
https://read.qxmd.com/read/30943823/nutrition-for-ultramarathon-running-trail-track-and-road
#4
Ricardo J S Costa, Beat Knechtle, Mark Tarnopolsky, Martin D Hoffman
Ultramarathon running events and participation numbers have increased progressively over the past three decades. Besides the exertion of prolonged running with or without a loaded pack, such events are often associated with challenging topography, environmental conditions, acute transient lifestyle discomforts, and/or event-related health complications. These factors create a scenario for greater nutritional needs, while predisposing ultramarathon runners to multiple nutritional intake barriers. The current review aims to explore the physiological and nutritional demands of ultramarathon running and provide general guidance on nutritional requirements for ultramarathon training and competition, including aspects of race nutrition logistics...
April 3, 2019: International Journal of Sport Nutrition and Exercise Metabolism
https://read.qxmd.com/read/30943820/abstracts-from-the-december-2018-international-sports-and-exercise-nutrition-conference-in-newscastle-upon-tyne
#5
(no author information available yet)
No abstract text is available yet for this article.
April 3, 2019: International Journal of Sport Nutrition and Exercise Metabolism
https://read.qxmd.com/read/30943814/sprinting-dietary-approaches-to-optimize-training-adaptation-and-performance
#6
Gary J Slater, Jennifer Sygo, Majke Jorgensen
Although sprint athletes are assumed to primarily be interested in promoting muscle hypertrophy, it is the ability to generate explosive muscle power, optimization of power-to-weight ratio, and enhancement of anaerobic energy generation that are key outcomes of sprint training. This reflects the physique of track sprinters, being characterized as ecto-mesomorphs. Although there is little contemporary data on sprinters dietary habits, given their moderate energy requirements relative to body mass, a carbohydrate intake within the range of 3-6 g·kg-1 ·day-1 appears reasonable, while ensuring carbohydrate availability is optimized around training...
April 3, 2019: International Journal of Sport Nutrition and Exercise Metabolism
https://read.qxmd.com/read/30632425/the-effect-of-1-3-butanediol-on-cycling-time-trial-performance
#7
David M Shaw, Fabrice Merien, Andrea Braakhuis, Daniel Plews, Paul Laursen, Deborah K Dulson
This study investigated the effect of the racemic β-hydroxybutyrate (βHB) precursor, R,S-1,3-butanediol (BD), on time-trial (TT) performance and tolerability. A repeated-measures, randomized, crossover study was conducted in nine trained male cyclists (age, 26.7 ± 5.2 years; body mass, 69.6 ± 8.4 kg; height, 1.82 ± 0.09 m; body mass index, 21.2 ± 1.5 kg/m2 ; VO2 peak, 63.9 ± 2.5 ml·kg-1 ·min-1 ; Wmax , 389.3 ± 50.4 W). Participants ingested 0.35 g/kg of BD or placebo 30 min before and 60 min during 85 min of steady-state exercise, which preceded a ∼25- to 35-min TT (i...
March 29, 2019: International Journal of Sport Nutrition and Exercise Metabolism
https://read.qxmd.com/read/30859862/negligible-effects-of-beta-hydroxy-beta-methylbutyrate-free-acid-and-calcium-salt-on-strength-and-hypertrophic-responses-to-resistance-training-a-randomised-placebo-controlled-study
#8
Aline C Tritto, Salomão Bueno, Rosa Mp Rodrigues, Bruno Gualano, Hamilton Roschel, Guilherme G Artioli
We evaluated the effects of beta-hydroxy-beta-methylbutyrate free-acid (HMB-FA) and calcium-salt (HMB-Ca) on strength, hypertrophy and markers of muscle damage. In this randomised, double-blind, placebo-controlled study, 44 resistance-trained men (age: 26±4 years; body mass: 84.9±12.0 kg) consuming ≥1.7 g·kg-1 ·day-1 of protein received HMB-FA (3g.day-1 ; n=14), HMB-Ca (3g.day-1 ; n=15) or placebo (PL, corn starch, 3g.day-1 ; n=15) for 12 weeks, while performing a periodised resistance training programme...
March 12, 2019: International Journal of Sport Nutrition and Exercise Metabolism
https://read.qxmd.com/read/30859854/supplement-use-and-behaviours-of-athletes-affiliated-with-an-australian-state-based-sports-institute
#9
Martin C Waller, Deborah A Kerr, Martyn J Binnie, Emily Eaton, Clare Wood, Terreen Stenvers, Daniel F Gucciardi, Carmel Goodman, Kagan J Ducker
We aimed to update knowledge of the use surrounding supplements amongst Australian athletes at a state-based sports institute. We conducted a cross-sectional survey using an online questionnaire to assess the influence of age, sports category, and scholarship category on supplement use. Of 94 completed questionnaires, 82 (87%) indicated supplements in the previous 12 months (mean=4.9±3.3). No significant difference in supplement usage rate was identified when considering age, scholarship category, or sport category...
March 12, 2019: International Journal of Sport Nutrition and Exercise Metabolism
https://read.qxmd.com/read/30859848/effects-of-different-vitamin-c-enriched-collagen-derivatives-on-collagen-synthesis
#10
Dana M Lis, Keith Baar
Nutritional strategies to improve connective tissue collagen synthesis have garnered significant interest, although the scientific validity of these interventions lags behind their hype. This study was designed to determine the effects of three forms of collagen on N-terminal peptide of procollagen I (PINP) and serum amino acid levels. Ten recreationally active males completed a randomized double-blinded cross-over design study consuming either placebo, 15 g of vitamin C enriched gelatin, hydrolyzed collagen or gummy containing equal parts gelatin and hydrolyzed collagen...
March 12, 2019: International Journal of Sport Nutrition and Exercise Metabolism
https://read.qxmd.com/read/30859847/resistance-training-antioxidant-status-and-antioxidant-supplementation
#11
Ahmed Ismaeel, Michael Holmes, Evlampia Papoutsi, Lynn Panton, Panagiotis Koutakis
Resistance training (RT) is known to promote the generation of reactive oxygen species (ROS). While this can likely upregulate the natural, endogenous antioxidant defense systems, high amounts of ROS can cause skeletal muscle damage, fatigue, and impair recovery. To prevent against this, antioxidant supplements are commonly consumed along with exercise. Recently it has been shown that these ROS may be important to the cellular adaptation process, acting as redox signaling molecules. However, most of the research regarding antioxidant status and antioxidant supplementation with exercise have focused on endurance training...
March 12, 2019: International Journal of Sport Nutrition and Exercise Metabolism
https://read.qxmd.com/read/30676138/special-environments-altitude-and-heat
#12
Philo U Saunders, Laura A Garvican-Lewis, Robert F Chapman, Julien D Périard
High-level athletes are always looking at ways to maximize training adaptations for competition performance, and using altered environmental conditions to achieve this outcome has become increasingly popular by elite athletes. Furthermore, a series of potential nutrition and hydration interventions may also optimize the adaptation to altered environments. Altitude training was first used to prepare for competition at altitude, and it still is today; however, more often now, elite athletes embark on a series of altitude training camps to try to improve sea-level performance...
March 12, 2019: International Journal of Sport Nutrition and Exercise Metabolism
https://read.qxmd.com/read/30676133/nutrition-for-the-prevention-and-treatment-of-injuries-in-track-and-field-athletes
#13
Graeme L Close, Craig Sale, Keith Baar, Stephane Bermon
Injuries are an inevitable consequence of athletic performance with most athletes sustaining one or more during their athletic careers. As many as one in 12 athletes incur an injury during international competitions, many of which result in time lost from training and competition. Injuries to skeletal muscle account for over 40% of all injuries, with the lower leg being the predominant site of injury. Other common injuries include fractures, especially stress fractures in athletes with low energy availability, and injuries to tendons and ligaments, especially those involved in high-impact sports, such as jumping...
March 8, 2019: International Journal of Sport Nutrition and Exercise Metabolism
https://read.qxmd.com/read/30632413/presleep-protein-supplementation-does-not-improve-recovery-during-consecutive-days-of-intense-endurance-training-a-randomized-controlled-trial
#14
Mads S Larsen, Dagmar Clausen, Astrid Ank Jørgensen, Ulla R Mikkelsen, Mette Hansen
Recent studies demonstrate that protein ingestion immediately before sleep improves muscle recovery during the night following resistance exercise. Whether this feeding strategy benefits recovery from endurance training has yet to be established. The aim of this study was to investigate the effects of whey protein isolate ingested every night before sleep on subsequent performance and circulatory markers of muscular recovery during a week of intensified endurance training mimicking a training camp. In a parallel design, 32 trained runners underwent a 1-week intervention with a rigorously controlled diet (carbohydrate = 7...
March 6, 2019: International Journal of Sport Nutrition and Exercise Metabolism
https://read.qxmd.com/read/30632422/energy-availability-in-athletics-health-performance-and-physique
#15
Anna K Melin, Ida A Heikura, Adam Tenforde, Margo Mountjoy
The reported prevalence of low energy availability (LEA) in female and male track and field athletes is between 18% and 58% with the highest prevalence among athletes in endurance and jump events. In male athletes, LEA may result in reduced testosterone levels and libido along with impaired training capacity. In female track and field athletes, functional hypothalamic amenorrhea as consequence of LEA has been reported among 60% of elite middle- and long-distance athletes and 23% among elite sprinters. Health concerns with functional hypothalamic amenorrhea include impaired bone health, elevated risk for bone stress injury, and cardiovascular disease...
February 26, 2019: International Journal of Sport Nutrition and Exercise Metabolism
https://read.qxmd.com/read/30632419/association-of-serum-25-hydroxyvitamin-d-concentrations-with-glucose-profiles-in-male-collegiate-football-athletes
#16
Xiaomin Sun, Zhen-Bo Cao, Kumpei Tanisawa, Satomi Oshima, Mitsuru Higuchi
Low serum 25-hydroxyvitamin D [25(OH)D] concentrations are associated with a high risk of insulin resistance and Type 2 diabetes mellitus in adults. However, it is unknown whether this is the case for American collegiate football and rugby football athletes. This study investigated the associations between serum 25(OH)D concentrations and glucose profiles in male collegiate football athletes. Thirty-four collegiate athletes (13 American football players and 21 rugby football players) aged 21 years were recruited...
February 26, 2019: International Journal of Sport Nutrition and Exercise Metabolism
https://read.qxmd.com/read/30299200/the-magnitude-of-rapid-weight-loss-and-rapid-weight-gain-in-combat-sport-athletes-preparing-for-competition-a-systematic-review
#17
Joseph J Matthews, Edward N Stanhope, Mark S Godwin, Matthew E J Holmes, Guilherme G Artioli
Combat sport athletes typically engage in a process called making weight, characterized by rapid weight loss (RWL) and subsequent rapid weight gain (RWG) in the days preceding competition. These practices differ across each sport, but no systematic comparison of the size of the changes in body mass exists. The aim was to determine the magnitude of RWL and RWG in combat sport athletes preparing for competition. The review protocol was preregistered with PROSPERO (CRD42017055279). In eligible studies, athletes prepared habitually with a RWL period ≤7 days preceding competition...
February 26, 2019: International Journal of Sport Nutrition and Exercise Metabolism
https://read.qxmd.com/read/30507257/nutrition-for-travel-from-jet-lag-to-catering
#18
Shona L Halson, Louise M Burke, Jeni Pearce
Domestic and international travel represents a regular challenge to high-performance track-and-field athletes, particularly when associated with the pressure of competition or the need to support specialized training (e.g., altitude or heat adaptation). Jet lag is a challenge for transmeridian travelers, while fatigue and alterations to gastrointestinal comfort are associated with many types of long-haul travel. Planning food and fluid intake that is appropriate to the travel itinerary may help to reduce problems...
February 22, 2019: International Journal of Sport Nutrition and Exercise Metabolism
https://read.qxmd.com/read/30299192/sports-foods-and-dietary-supplements-for-optimal-function-and-performance-enhancement-in-track-and-field-athletes
#19
Peter Peeling, Linda M Castell, Wim Derave, Olivier de Hon, Louise M Burke
Athletes are exposed to numerous nutritional products, attractively marketed with claims of optimizing health, function, and performance. However, there is limited evidence to support many of these claims, and the efficacy and safety of many products is questionable. The variety of nutritional aids considered for use by track-and-field athletes includes sports foods, performance supplements, and therapeutic nutritional aids. Support for sports foods and five evidence-based performance supplements (caffeine, creatine, nitrate/beetroot juice, β-alanine, and bicarbonate) varies according to the event, the specific scenario of use, and the individual athlete's goals and responsiveness...
February 17, 2019: International Journal of Sport Nutrition and Exercise Metabolism
https://read.qxmd.com/read/30747558/contemporary-nutrition-strategies-to-optimize-performance-in-distance-runners-and-race-walkers
#20
Louise M Burke, Asker E Jeukendrup, Andrew M Jones, Martin Mooses
Distance events in Athletics include cross country, the 10,000 m track race, half marathon and marathon road races, and 20 and 50 km race walking events, over different terrain and environmental conditions. Race times for elite performers span ~26 min to >4 h, with key factors for success being a high aerobic power, the ability to exercise at a large fraction of this power, and high economy of movement. Nutrition-related contributors include body mass and anthropometry, capacity to use fuels, particularly carbohydrate (CHO) to produce ATP economically over the duration of the event, and maintenance of reasonable hydration status in the face of sweat losses induced by exercise intensity and the environment...
February 12, 2019: International Journal of Sport Nutrition and Exercise Metabolism
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