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Nutrition and Athletic Performance

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https://www.readbyqxmd.com/read/28524103/potential-impact-of-nutrition-on-immune-system-recovery-from-heavy-exertion-a-metabolomics-perspective
#1
REVIEW
David C Nieman, Susan Hazels Mitmesser
This review describes effective and ineffective immunonutrition support strategies for the athlete, with a focus on the benefits of carbohydrates and polyphenols as determined from metabolomics-based procedures. Athletes experience regular cycles of physiological stress accompanied by transient inflammation, oxidative stress, and immune perturbations, and there are increasing data indicating that these are sensitive to nutritional influences. The most effective nutritional countermeasures, especially when considered from a metabolomics perspective, include acute and chronic increases in dietary carbohydrate and polyphenols...
May 18, 2017: Nutrients
https://www.readbyqxmd.com/read/28515835/the-effect-of-acute-hyperglycemia-on-muscular-strength-power-and-endurance
#2
Franklin Lime-Ma, Joshua A Cotter, Evan E Schick
The purpose of this study was to elucidate the impact of acute hyperglycemia on skeletal muscle strength, power, and endurance. Ten male collegiate athletes (age 21.5 ± 1.5 years, height 186 ± 2.03 cm, body mass 108.8 ± 7.6 kg) participated in 2 testing sessions, separated by 7 days and randomized for either high glucose (HG) or control (C) treatment conditions. HG consumed a high glucose drink (2 g glucose/kg body weight) while controls consumed an isocaloric nutrition bar (40% protein, 30% fat, and 30% carbohydrate)...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28493406/beta-hydroxy-beta-methylbutyrate-supplementation-and-skeletal-muscle-in-healthy-and-muscle-wasting-conditions
#3
REVIEW
Milan Holeček
Beta-hydroxy-beta-methylbutyrate (HMB) is a metabolite of the essential amino acid leucine that has been reported to have anabolic effects on protein metabolism. The aims of this article were to summarize the results of studies of the effects of HMB on skeletal muscle and to examine the evidence for the rationale to use HMB as a nutritional supplement to exert beneficial effects on muscle mass and function in various conditions of health and disease. The data presented here indicate that the beneficial effects of HMB have been well characterized in strength-power and endurance exercise...
May 10, 2017: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/28435337/treatment-strategies-for-the-female-athlete-triad-in-the-adolescent-athlete-current-perspectives
#4
REVIEW
Jill Thein-Nissenbaum, Erin Hammer
Since the passage of Title IX in 1972, female sports participation has dramatically increased. The benefits of physical activity, including decreased risk for heart disease and diabetes as well as improved body image and self-esteem, far outweigh the risks. However, a select population of adolescent and young adult females may experience symptoms related to the female athlete triad (Triad), which refers to the interrelatedness of energy availability, menstrual function, and bone mineral density (BMD). These conditions often manifest clinically as disordered eating behaviors, menstrual irregularity, and stress fractures; an individual may suffer from 1 or all of the Triad components simultaneously...
2017: Open Access Journal of Sports Medicine
https://www.readbyqxmd.com/read/28429998/the-efficacy-of-a-pre-workout-vegan-supplement-on-high-intensity-cycling-performance-in-healthy-college-aged-males
#5
Gabrielle Gallien, David Bellar, Greggory R Davis
There is a limited supply of sport nutrition supplements currently available for vegan or vegetarian athletes. In addition, the efficacy of a vegan or vegetarian pre-workout supplement that does not contain any processed ingredients or stimulants is currently unknown. The purpose of the current study was to examine the effects of an unprocessed vegan pre-workout supplement on high-intensity cycling performance. Participants completed three separate cycling trials following the consumption of a vegan pre-workout supplement, an isocaloric processed supplement, or a zero-calorie placebo supplement...
November 2, 2017: Journal of Dietary Supplements
https://www.readbyqxmd.com/read/28422588/alterations-in-redox-homeostasis-during-recovery-from-unexplained-underperformance-syndrome-in-an-elite-international-rower
#6
Nathan A Lewis, Ann Redgrave, Mark Homer, Richard Burden, Wendy Martinson, Brian Moore, Charles R Pedlar
PURPOSE: This case study of an international rower examines a diagnosis of Unexplained Under Performance Syndrome (UUPS or Overtraining Syndrome) describing a full recovery and return to elite competition the same year. METHODS: On diagnosis and 4 and 14 months post-diagnosis, detailed assessments including physiological, nutritional, and biomarkers were made. RESULTS: Clinical examination and laboratory results for haematology, biochemistry, thyroid function, immunology, vitamins and minerals were unremarkable and did not explain the presentation and diagnosis...
April 19, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28408889/effects-of-sesame-sesamum-indicum-l-supplementation-on-creatine-kinase-lactate-dehydrogenase-oxidative-stress-markers-and-aerobic-capacity-in-semi-professional-soccer-players
#7
Carlos V da Silva Barbosa, Alexandre S Silva, Caio V C de Oliveira, Nayara M L Massa, Yasmim R F de Sousa, Whyara K A da Costa, Ayice C Silva, Plínio Delatorre, Rhayane Carvalho, Valdir de Andrade Braga, Marciane Magnani
Nutritional intervention with antioxidants rich foods has been considered a strategy to minimize the effects of overtraining in athletes. This experimental, randomized, and placebo-controlled study evaluated the effects of consumption of sesame (Sesamum indicum L.) on muscle damage markers, oxidative stress, systemic inflammation, and aerobic performance in male semi-professional soccer players. Twenty athletes were randomly assigned to groups that received 40 g (two tablespoons) per day of sesame or a placebo during 28 days of regular training (exposed to routine training that includes loads of heavy training in the final half of the season)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28387575/nutritional-considerations-for-bouldering
#8
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 optimise performance remain inadequately defined due to large gaps in the literature. The primary goals of training include optimising 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...
April 7, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28368321/sport-nutrition-knowledge-behaviors-and-beliefs-of-high-school-soccer-players
#9
Melinda M Manore, Megan M Patton-Lopez, Yu Meng, Siew Sun Wong
For adolescent athletes (14-18 years), data on sport nutrition knowledge, behaviors and beliefs are limited, especially based on sex, race/ethnicity and socioeconomic status. High school soccer players (n = 535; 55% female; 51% White, 41% Latino; 41% National School Lunch Program (NSLP) participants (80% Latino)) completed two questionnaires (demographic/health history and sport nutrition). The sport nutrition knowledge score was 45.6% with higher scores in NSLP-Whites vs. NSLP-Latinos (p < 0.01). Supplement knowledge differed by sex (16% lower in females; p = 0...
April 1, 2017: Nutrients
https://www.readbyqxmd.com/read/28349656/equine-performance-genes-and-the-future-of-doping-in-horseracing
#10
Tessa Wilkin, Anna Baoutina, Natasha Hamilton
A horse's success on the racetrack is determined by genetics, training and nutrition, and their translation into physical traits such as speed, endurance and muscle strength. Advances in genetic technologies are slowly explaining the roles of specific genes in equine performance, and offering new insights into the development of novel therapies for diseases and musculoskeletal injuries that cause early retirement of many racehorses. Gene therapy approaches may also soon provide new means to artificially enhance the physical performance of racehorses...
March 27, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/28346362/nutrition-assessment-of-b-vitamins-in-highly-active-and-sedentary-women
#11
Kathleen Woolf, Nicole L Hahn, Megan M Christensen, Amanda Carlson-Phillips, Christine M Hansen
BACKGROUND: Female athletes and active women require adequate nutrition for optimal health and performance. Nutrition assessments are needed to identify potential nutrients of concern. Folate, vitamin B6, and vitamin B12 function in important pathways used during physical activity and female athletes may be at risk for poor status of these micronutrients. This cross-sectional study described a comprehensive nutrition assessment of the B-vitamins (folate, vitamin B6, and vitamin B12) using both dietary (food and dietary supplements) and biochemical assessments among highly active and sedentary women...
March 26, 2017: Nutrients
https://www.readbyqxmd.com/read/28344459/applied-sports-nutrition-support-dietary-intake-and-body-composition-changes-of-a-female-athlete-completing-26-marathons-in-26-days-a-case-study
#12
Chris J McManus, Kelly A Murray, David A Parry
The aim of this case study is to describe the nutrition practices of a female recreational runner (VO2max 48.9 ml·kg(-1)·min(-1)) who completed 26 marathons (42.195 km) in 26 consecutive days. Information relating to the nutritional intake of female runners during multi-day endurance events is extremely limited, yet the number of people participating year-on-year continues to increase. This case study reports the nutrition intervention, dietary intake, body composition changes and performance in the lead-up and during the 26 days...
March 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28332118/nutrition-and-training-influences-on-the-regulation-of-mitochondrial-adenosine-diphosphate-sensitivity-and-bioenergetics
#13
REVIEW
Graham P Holloway
Since the seminal finding almost 50 years ago that exercise training increases mitochondrial content in skeletal muscle, a considerable amount of research has been dedicated to elucidate the mechanisms inducing mitochondrial biogenesis. The discovery of peroxisome proliferator-activated receptor γ co-activator 1α as a major regulator of exercise-induced gene transcription was instrumental in beginning to understand the signals regulating this process. However, almost two decades after its discovery, our understanding of the signals inducing mitochondrial biogenesis remain poorly defined, limiting our insights into possible novel training modalities in elite athletes that can increase the oxidative potential of muscle...
March 2017: Sports Medicine
https://www.readbyqxmd.com/read/28332115/periodized-nutrition-for-athletes
#14
REVIEW
Asker E Jeukendrup
It is becoming increasingly clear that adaptations, initiated by exercise, can be amplified or reduced by nutrition. Various methods have been discussed to optimize training adaptations and some of these methods have been subject to extensive study. To date, most methods have focused on skeletal muscle, but it is important to note that training effects also include adaptations in other tissues (e.g., brain, vasculature), improvements in the absorptive capacity of the intestine, increases in tolerance to dehydration, and other effects that have received less attention in the literature...
March 2017: Sports Medicine
https://www.readbyqxmd.com/read/28332114/training-the-gut-for-athletes
#15
REVIEW
Asker E Jeukendrup
The gastrointestinal (GI) tract plays a critical role in delivering carbohydrate and fluid during prolonged exercise and can therefore be a major determinant of performance. The incidence of GI problems in athletes participating in endurance events is high, indicating that GI function is not always optimal in those conditions. A substantial body of evidence suggests that the GI system is highly adaptable. Gastric emptying as well as stomach comfort can be "trained" and perceptions of fullness decreased; some studies have suggested that nutrient-specific increases in gastric emptying may occur...
March 2017: Sports Medicine
https://www.readbyqxmd.com/read/28332111/practical-issues-in-evidence-based-use-of-performance-supplements-supplement-interactions-repeated-use-and-individual-responses
#16
REVIEW
Louise M Burke
Current sports nutrition guidelines recommend that athletes only take supplements following an evidence-based analysis of their value in supporting training outcomes or competition performance in their specific event. While there is sound evidence to support the use of a few performance supplements under specific scenarios (creatine, beta-alanine, bicarbonate, caffeine, nitrate/beetroot juice and, perhaps, phosphate), there is a lack of information around several issues needed to guide the practical use of these products in competitive sport...
March 2017: Sports Medicine
https://www.readbyqxmd.com/read/28321588/use-of-bioimpedianciometer-as-predictor-of-mountain-marathon-performance
#17
Vicente Javier Clemente-Suarez, Pantelis Theodoros Nikolaidis
This study aimed to examine the relation among body composition, training experience and race time during a mountain marathon. Body composition and training pre-race experience analyses were conducted previous to a mountain marathon in 52 male athletes. A significant correlation between race time and mountain marathon with chronological age, body fat mass, percentage of body fat (BF), level of abdominal obesity, sport experience and daily training volume was revealed. In addition, BF and athlete's chronological age were negatively associated with race performance...
May 2017: Journal of Medical Systems
https://www.readbyqxmd.com/read/28316263/individualised-dietary-strategies-for-olympic-combat-sports-acute-weight-loss-recovery-and-competition-nutrition
#18
Reid Reale, Gary Slater, Louise M Burke
Olympic combat sports separate athletes into weight divisions, in an attempt to reduce size, strength, range and/or leverage disparities between competitors. Official weigh-ins are conducted anywhere from 3 and up to 24 h prior to competition ensuring athletes meet weight requirements (i.e. have 'made weight'). Fighters commonly aim to compete in weight divisions lower than their day-to-day weight, achieved via chronic and acute manipulations of body mass (BM). Although these manipulations may impair health and absolute performance, their strategic use can improve competitive success...
July 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28253030/case-study-the-effect-of-32-weeks-of-figure-contest-preparation-on-a-self-proclaimed-drug-free-female-s-lean-body-and-bone-mass
#19
John Petrizzo, Frederick J DiMenna, Kimberly Martins, John Wygand, Robert M Otto
To achieve the criterion appearance prior to competing in a physique competition, athletes undergo preparatory regimens involving high-volume intense resistance and aerobic exercise with hypocaloric energy intake. As the popularity of "drug-free" competition increases, more athletes are facing this challenge without the recuperative advantage provided by performance-enhancing drugs. Consequently, the likelihood of loss of lean body and/or bone mass is increased. The purpose of this investigation was to monitor changes in body composition for a 29-year-old self-proclaimed drug-free female figure competitor during a 32-week preparatory regimen comprising high-volume resistance and aerobic exercise with hypocaloric energy intake...
March 2, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28204901/the-effect-of-hydration-status-on-the-measurement-of-lean-tissue-mass-by-dual-energy-x-ray-absorptiometry
#20
Clodagh M Toomey, William G McCormack, Phil Jakeman
PURPOSE: Athletes cycle between exercise and recovery. Exercise invokes changes in total body water from thermal sweating, muscle and hepatic glycogen depletion and metabolic water loss. Recovery from exercise results in rehydration, substrate repletion, and possible glycogen supercompensation. Such changes may corrupt the measurement of hydrated tissues, such as lean tissue mass (LTM), by dual-energy X-ray absorptiometry (DXA). The purpose of this study was to determine the effect of exercise and thermal dehydration and subsequent glycogen supercompensation on DXA-based measurement of body composition...
March 2017: European Journal of Applied Physiology
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