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https://www.readbyqxmd.com/read/28058459/-nutritional-supplements-in-sports-sense-nonsense-or-hazard
#1
Maria Kristina Parr, Sebastian Schmidtsdorff, Annette Sophie Kollmeier
The excessive sale of dietary supplements (DSs) has become a global multi-billion market as more and more people turn to DSs for a healthy lifestyle or for aesthetic reasons. DSs are also increasingly popular among athletes; 50-85% of recreational and 35-100% of competitive athletes report taking DSs, the latter more regularly. Unless pathological deficiencies are detected, the intake of DSs for recreational athletes is not recommended. While it may be advisable for competitive athletes to supplement their diet with certain macronutrients (proteins and carbohydrates), many micronutrients (vitamins, minerals) as well as allegedly performance enhancing DSs may only show minimal impact under specific conditions and for certain sports...
January 5, 2017: Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz
https://www.readbyqxmd.com/read/28050921/influence-of-dietary-acid-load-on-exercise-performance
#2
Catherine Applegate, Mackenzie Mueller, Krystle E Zuniga
Diet composition can affect systemic pH and acid-base regulation, which may in turn influence exercise performance. An acidic environment in the muscle impairs performance and contributes to fatigue; therefore, current trends in sports nutrition place importance on maximizing the alkalinity of the body with ergogenic aids and dietary strategies. This review examines the evidence on the effects of dietary manipulations on acid load and exercise performance. Ten studies that investigated the effect of high versus low dietary acid loads on athletic performance generally identified that low dietary acid loads increased plasma pH, but did not consistently improve exercise performance at maximal or submaximal exercise intensities...
January 4, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28019093/creatine-and-creatine-forms-intended-for-sports-nutrition
#3
REVIEW
Susanne Andres, Rainer Ziegenhagen, Iris Trefflich, Sophie Pevny, Katharina Schultrich, Hans Braun, Wilhelm Schänzer, Karen Ildico Hirsch-Ernst, Bernd Schäfer, Alfonso Lampen
Creatine is a popular ergogenic supplement in sports nutrition. Yet, supplementation of creatine occasionally caused adverse effects such as gastrointestinal complaints, muscle cramps and an increase in body weight. Creatine monohydrate has already been evaluated by different competent authorities and several have come to the conclusion that a daily intake of 3 g creatine per person is unlikely to pose safety concerns, focusing on healthy adults with exclusion of pregnant and breastfeeding women. Possible vulnerable subgroups were also discussed in relation to the safety of creatine...
December 25, 2016: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/28010854/a-tale-of-two-runners-a-case-report-of-athletes-experiences-with-eating-disorders-in%C3%A2-college
#4
Paula A Quatromoni
Athletes are at higher risk than the general population for eating disorders, and risk is heightened for athletes in thin-build sports, including track. Collegiate athletes are particularly vulnerable to disordered eating when the transition from home to the college environment adds to the stress of performance pressures and the high demands of the sport environment. Male and female athletes who develop eating disorders share some common characteristics, yet their experiences can be quite different, in part as a consequence of their sex and how eating disorders develop, and are recognized, acknowledged, and treated, within the culture of sports...
January 2017: Journal of the Academy of Nutrition and Dietetics
https://www.readbyqxmd.com/read/27984500/seasonal-changes-in-soccer-players-body-composition-and-dietary-intake-practices
#5
Brooke L Devlin, Michael Kingsley, Michael D Leveritt, Regina Belski
The aims of this study were two-fold: to determine seasonal changes in dietary intake and body composition in elite soccer players and to evaluate the influence of self-determined individual body composition goals on dietary intake and body composition. This longitudinal, observational study assessed body composition (total mass, fat-free soft tissue mass and fat mass) using dual-energy x-ray absorptiometry and dietary intake (energy and macronutrients) via multiple pass 24-hour recalls, at four time points over a competitive season in elite soccer players from one professional club in the Australian A-League competition...
November 29, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27967263/starvation-can-result-from-inadequate-dietary-planning-for-a-50-day-rowing-expedition
#6
Hamish Ab Reid, Nicholas C Dennison, Jonathan Quayle, Tom Preston
PURPOSE: Meeting the energy demands of prolonged arduous expeditions and endurance sport may be a significant barrier to success. Expedition rowing is associated with high levels of body mass loss, reflecting the challenge of meeting energy expenditure in this exacting environment. This study used the Doubly Labelled Water (DLW) technique to calculate the Total Energy Expenditure (TEE), and body composition changes of two 28-year-old healthy male athletes during a 50-day continuous and unsupported row around Great Britain...
December 14, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27928206/doping-attitudes-and-covariates-of-potential-doping-behaviour-in-high-level-team-sport-athletes-gender-specific-analysis
#7
Damir Sekulic, Enver Tahiraj, Milan Zvan, Natasa Zenic, Ognjen Uljevic, Blaz Lesnik
Team sports are rarely studied with regard to doping behaviour and doping-related factors regardless of their global popularity. This study aimed to investigate doping factors and covariates of potential doping behaviour in high-level team-sport athletes. The subjects were 457 high-performing, national- and international-level athletes (21.9 ± 3.4 years of age; 179 females) involved in volleyball (n = 77), soccer (n = 163), basketball (n = 114) and handball (n = 103). Previously validated self-administered questionnaires aimed at evidencing sport factors, doping-related factors, knowledge on sport nutrition and doping, and attitudes to performance enhancement were used...
December 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27923448/fit-with-good-fat-the-role-of-n-3-polyunsaturated-fatty-acids-on-exercise-performance
#8
REVIEW
Mariasole Da Boit, Angus M Hunter, Stuart R Gray
N-3 PUFA (n-3) polyunsaturated fatty acids (PUFA) are a family of fatty acids mainly found in oily fish and fish oil supplements. The effects of n-3 PUFA on health are mainly derived from its anti-inflammatory proprieties and its influence on immune function. Lately an increased interest in n-3 PUFA supplementation has reached the world of sport nutrition, where the majority of athletes rely on nutrition strategies to improve their training and performance. A vast amount of attention is paid in increasing metabolic capacity, delaying the onset of fatigue, and improving muscle hypertrophy and neuromuscular function...
January 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/27919521/unsolved-forgotten-and-ignored-features-of-the-placebo-response-in-medicine
#9
REVIEW
Paul Enck, Sibylle Klosterhalfen, Katja Weimer
PURPOSE: We aimed to identify topics of research that have been neglected, undervalued, or overseen in the past 2 decades of placebo/nocebo research. METHODS: A highly specialized literature database containing >3200 articles on the placebo or nocebo effects or response was screened for articles covering placebo effects in nutrition, sports medicine, physical therapy, and psychotherapy; for article covering gender, age, and culture as influencing factors; for articles dealing with long-term outcome, multimodality; and for articles related to technical (eHealth, mHealth) aspects of placebo effects...
December 2, 2016: Clinical Therapeutics
https://www.readbyqxmd.com/read/27890486/towards-a-multidisciplinary-approach-to-understand-and-manage-obesity-and-related-diseases
#10
REVIEW
Stephan C Bischoff, Yves Boirie, Tommy Cederholm, Michael Chourdakis, Cristina Cuerda, Nathalie M Delzenne, Nicolaas E Deutz, Denis Fouque, Laurence Genton, Carmen Gil, Berthold Koletzko, Miguel Leon-Sanz, Raanan Shamir, Joelle Singer, Pierre Singer, Nanette Stroebele-Benschop, Anders Thorell, Arved Weimann, Rocco Barazzoni
Overnutrition and sedentary lifestyle result in overweight or obesity defined as abnormal or excessive fat accumulation that may impair health. According to the WHO, the worldwide prevalence of obesity nearly doubled between 1980 and 2008. In 2008, over 50% of both men and women in the WHO European Region were overweight, and approximately 23% of women and 20% of men were obese. Comprehensive diagnostic and therapeutic approaches should include nutritional treatment to favor the best metabolic and nutritional outcome, as well as to induce potential disease-specific benefits from selected nutritional regimens...
November 16, 2016: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/27882605/placebo-in-sports-nutrition-a-proof-of-principle-study-involving-caffeine-supplementation
#11
B Saunders, L F de Oliveira, R P da Silva, V de Salles Painelli, L S Gonçalves, G Yamaguchi, T Mutti, E Maciel, H Roschel, G G Artioli, B Gualano
We investigated the effects of supplement identification on exercise performance with caffeine supplementation. Forty-two trained cyclists (age 37 ± 8 years, body mass [BM] 74.3 ± 8.4 kg, height 1.76 ± 0.06 m, maximum oxygen uptake 50.0 ± 6.8 mL/kg/min) performed a ~30 min cycling time-trial 1 h following either 6 mg/kgBM caffeine (CAF) or placebo (PLA) supplementation and one control (CON) session without supplementation. Participants identified which supplement they believed they had ingested ("caffeine", "placebo", "don't know") pre- and post-exercise...
November 23, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/27872757/sports-nutrition-knowledge-among-mid-major-division-i-university-student-athletes
#12
Ashley Andrews, Janet R Wojcik, Joni M Boyd, Charles J Bowers
Competitive athletes have goals to optimize performance and to maintain healthy body composition. Sports nutrition is a component of training programs often overlooked by student-athletes and their coaches. The purpose of this study was to examine student-athletes' sports nutrition knowledge across sex, class level, team, and completion of prior nutrition coursework. Participants included 123 mid-major Division I university student-athletes (47 females and 76 males) from baseball, softball, men's soccer, track and field, and tennis...
2016: Journal of Nutrition and Metabolism
https://www.readbyqxmd.com/read/27872151/non-occupational-physical-activity-levels-of-shift-workers-compared-with-non-shift-workers
#13
Bette Loef, Gerben Hulsegge, G C Wanda Wendel-Vos, W M Monique Verschuren, Roel C H Vermeulen, Marije F Bakker, Allard J van der Beek, Karin I Proper
OBJECTIVES: Lack of physical activity (PA) has been hypothesised as an underlying mechanism in the adverse health effects of shift work. Therefore, our aim was to compare non-occupational PA levels between shift workers and non-shift workers. Furthermore, exposure-response relationships for frequency of night shifts and years of shift work regarding non-occupational PA levels were studied. METHODS: Data of 5980 non-shift workers and 532 shift workers from the European Prospective Investigation into Cancer and Nutrition-Netherlands (EPIC-NL) were used in these cross-sectional analyses...
November 21, 2016: Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/27858306/menthol-a-fresh-ergogenic-aid-for-athletic-performance
#14
Christopher J Stevens, Russ Best
The application of menthol has recently been researched as a performance-enhancing aid for various aspects of athletic performance including endurance, speed, strength and joint range of motion. A range of application methods has been used including a mouth rinse, ingestion of a beverage containing menthol or external application to the skin or clothing via a gel or spray. The majority of research has focussed on the use of menthol to impart a cooling sensation on athletes performing endurance exercise in the heat...
November 17, 2016: Sports Medicine
https://www.readbyqxmd.com/read/27855498/mitochondria-targeted-nutraceuticals-in-sports-medicine-a-new-perspective
#15
Sergej M Ostojic
Since mitochondria have been recognized as the cells' key organelles involved in the energy utilization during exercise, targeting the organelle with specifically designed compounds (mitochondria-targeted nutraceuticals, MTNs) may have a great promise in the prevention and treatment of heavy exercise-related mitochondrial dysfunction. In vitro studies suggested that MTNs have antioxidant effects at the molecular level, and might boost mitochondrial biogenesis and organelle bioenergetics, with both processes are known to positively affect exercise performance and recovery...
January 2017: Research in Sports Medicine
https://www.readbyqxmd.com/read/27852613/vitamin-c-enriched-gelatin-supplementation-before-intermittent-activity-augments-collagen-synthesis
#16
Gregory Shaw, Ann Lee-Barthel, Megan Lr Ross, Bing Wang, Keith Baar
BACKGROUND: Musculoskeletal injuries are the most common complaint in active populations. More than 50% of all injuries in sports can be classified as sprains, strains, ruptures, or breaks of musculoskeletal tissues. Nutritional and/or exercise interventions that increase collagen synthesis and strengthen these tissues could have an important effect on injury rates. OBJECTIVE: This study was designed to determine whether gelatin supplementation could increase collagen synthesis...
January 2017: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/27848725/results-from-south-africa-s-2016-report-card-on-physical-activity-for-children-and-youth
#17
Monika Uys, Susan Bassett, Catherine E Draper, Lisa Micklesfield, Andries Monyeki, Anniza de Villiers, Estelle V Lambert
BACKGROUND: We present results of the 2016 Healthy Active Kids South Africa (HAKSA) Report Card on the current status of physical activity (PA) and nutrition in South African youth. The context in which we interpret the findings is that participation in PA is a fundamental human right, along with the right to "attainment of the highest standard of health." METHODS: The HAKSA 2016 Writing Group was comprised of 33 authorities in physical education, exercise science, nutrition, public health, and journalism...
November 2016: Journal of Physical Activity & Health
https://www.readbyqxmd.com/read/27835960/parent-child-associations-for-changes-in-diet-screen-time-and-physical-activity-across-two-decades-in-modernizing-china-china-health-and-nutrition-survey-1991-2009
#18
Fei Dong, Annie Green Howard, Amy H Herring, Amanda L Thompson, Linda S Adair, Barry M Popkin, Allison E Aiello, Bing Zhang, Penny Gordon-Larsen
BACKGROUND: While the household context is important for lifestyle behavior interventions, few studies have examined parent-child associations for diet and physical activity (PA) changes over time in a rapidly urbanizing country. We aimed to investigate changes in diet, screen time, and PA behaviors over time in children and their parents living in the same household, and examine the parent-child association for these behaviors. METHODS: We studied dietary, screen time, and PA behaviors in 5,201 parent-child pairs (children aged 7-17y) using longitudinal data from the China Health and Nutrition Survey (1991, 1993, 1997, 2000, 2004, 2006, and 2009)...
November 11, 2016: International Journal of Behavioral Nutrition and Physical Activity
https://www.readbyqxmd.com/read/27834565/weight-re-gain-is-not-linked-to-success-in-a-real-life-multi-day-boxing-tournament
#19
Reid Reale, Gregory R Cox, Gary Slater, Louise M Burke
PURPOSE: Combat sport athletes acutely reduce body mass (BM) prior to weigh-in in an attempt to gain a size/strength advantage over smaller opponents. Few studies have investigated these practices among boxers and none have explored the impact of this practice on competitive success. METHODS: One hundred (30♀/70♂) elite boxers participating in the Australian National Championships were weighed at the official weigh-in and an hour before each competition bout...
November 11, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27824059/vitamin-d-deficiency-in-individuals-with-a-spinal-cord-injury-a-literature-review
#20
REVIEW
J L Flueck, C Perret
STUDY DESIGN: Literature review of studies investigating vitamin D status in individuals with a spinal cord injury (SCI). OBJECTIVES: Prevalence of vitamin D deficiency seems to be high in the general population. Little is known regarding such a deficiency in individuals with a SCI. This review aimed to examine the literature that investigated vitamin D status in this population. SETTING: Switzerland. METHODS: A literature review was performed to investigate the prevalence of vitamin D deficiency in individuals with a SCI and to determine the factors leading to deficiency...
November 8, 2016: Spinal Cord
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