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https://www.readbyqxmd.com/read/28080323/oral-adenosine-5-triphosphate-atp-administration-increases-postexercise-atp-levels-muscle-excitability-and-athletic-performance-following-a-repeated-sprint-bout
#1
Martin Purpura, John A Rathmacher, Matthew H Sharp, Ryan P Lowery, Kevin A Shields, Jeremy M Partl, Jacob M Wilson, Ralf Jäger
OBJECTIVE: Oral adenosine-5'-triphosphate (ATP) administration has failed to increase plasma ATP levels; however, chronic supplementation with ATP has shown to increase power, strength, lean body mass, and blood flow in trained athletes. The purpose of this study was to investigate the effects of ATP supplementation on postexercise ATP levels and on muscle activation and excitability and power following a repeated sprint bout. METHODS: In a double-blind, placebo-controlled, randomized design, 42 healthy male individuals were given either 400 mg of ATP as disodium salt or placebo for 2 weeks prior to an exercise bout...
January 12, 2017: Journal of the American College of Nutrition
https://www.readbyqxmd.com/read/28058460/-risk-assessment-of-synephrine-in-dietary-supplements
#2
Nadiya Bakhyia, Birgit Dusemund, Klaus Richter, Oliver Lindtner, Karen Ildico Hirsch-Ernst, Bernd Schäfer, Alfonso Lampen
Synephrine is a sympathomimetic phenylethylamine derivative that occurs naturally in citrus fruits. It is often added to dietary supplements intended for weight loss and enhancement of sports performance, typically in the form of Citrus aurantium extracts and in many cases in combination with caffeine. The health risks of synephrine were evaluated on the basis of the available toxicological data and in accordance to the EFSA guidance on the safety assessment of botanicals and botanical preparations intended for use in food supplements...
January 5, 2017: Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz
https://www.readbyqxmd.com/read/28058459/-nutritional-supplements-in-sports-sense-nonsense-or-hazard
#3
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/28054117/-self-medication-with-vitamins-minerals-and-food-supplements-in-germany-results-of-nationwide-health-surveys
#4
Hildtraud Knopf
BACKGROUND AND OBJECTIVES: Vitamins, minerals and food supplements (FSs) are often used without medical prescription. Valid data on the magnitude of use are rare in Germany. The aim of the present analysis is to describe the prevalence and trends of self-medication and the associations between health-related factors and self-medication with these substances. METHODS: The data base consisted of the results of nationwide health surveys (GNHIES98: 1997-1999 and DEGS1: 2008-2001) in which adults aged 18-79 years were interviewed on health-related themes and were examined...
January 4, 2017: Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz
https://www.readbyqxmd.com/read/28028987/evaluation-of-the-erosive-potential-of-selected-isotonic-drinks-in-vitro-studies
#5
Aneta Ostrowska, Witold Szymański, Łukasz Kołodziejczyk, Elżbieta Bołtacz-Rzepkowska
BACKGROUND: Isotonic drinks are an important component of the diet of athletes. Sports drinks cause the body to maintain proper hydration and supplement minerals which are lost in sweat during excessive exercising. Aside from the benefits of isotonic drinks, it is important to be aware of the harmful effects of citric acid within the products, which could cause enamel erosion. OBJECTIVES: The aim of the study was to evaluate the erosive potential of sports drinks using confocal scanning laser microscopy (CLSM)...
November 2016: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/28019093/creatine-and-creatine-forms-intended-for-sports-nutrition
#6
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/28009798/vitamin-d-deficiency-the-missing-etiological-factor-in-the-development-of-juvenile-osteochondrosis-dissecans
#7
Gerrit S Maier, Djordje Lazovic, Uwe Maus, Klaus E Roth, Konstantin Horas, Jörn B Seeger
BACKGROUND: Vitamin D deficiency can result in rickets and hypocalcemia during infant and childhood growth. There is an increasing interest in the role of vitamin D with regards to childhood bone health. Osteochondrosis dissecans (OD) is a common disease affecting different joints. To date, the exact etiology of OD still remains unclear. The aim of this study was to evaluate a possible association of vitamin D deficiency and juvenile OD. METHODS: A retrospective chart review of the years 2010 to 2015 of all orthopaedic patients with an initial diagnosis of juvenile OD admitted to undergo operative treatment of the OD was performed...
December 22, 2016: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/27997264/decrease-in-ionized-and-total-magnesium-blood-concentrations-in-endurance-athletes-following-an-exercise-bout-restores-within-hours-potential-consequences-for-monitoring-and-supplementation
#8
Rieneke Terink, Michael G J Balvers, Maria T Hopman, Renger F Witkamp, Marco Mensink, Jacqueline M T Klein Gunnewiek
Magnesium is essential for optimal sport performance, generating an interest to monitor its status in athletes. However, before measuring magnesium status in blood could become routine, more insight into its diurnal fluctuations and effects of exercise itself is necessary. Therefore, we measured the effect of an acute bout of exercise on ionized (iMg) and total plasma magnesium (tMg) in blood obtained from 18 healthy well-trained endurance athletes (age, 31.1 ± 8.1 yr.; VO2max, 50.9 ± 7.5 ml/kg/min) at multiple time points, and compared this with a resting situation...
December 20, 2016: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/27989355/knee-shoulder-and-fundamentals-of-arthroscopic-surgery-training-validation-of-a-virtual-arthroscopy-simulator
#9
Josef N Tofte, Brian O Westerlind, Kevin D Martin, Brian L Guetschow, Bastián Uribe-Echevarria, Chamnanni Rungprai, Phinit Phisitkul
PURPOSE: To validate the knee, shoulder, and virtual Fundamentals of Arthroscopic Training (FAST) modules on a virtual arthroscopy simulator via correlations with arthroscopy case experience and postgraduate year. METHODS: Orthopaedic residents and faculty from one institution performed a standardized sequence of knee, shoulder, and FAST modules to evaluate baseline arthroscopy skills. Total operation time, camera path length, and composite total score (metric derived from multiple simulator measurements) were compared with case experience and postgraduate level...
December 15, 2016: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/27928206/doping-attitudes-and-covariates-of-potential-doping-behaviour-in-high-level-team-sport-athletes-gender-specific-analysis
#10
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
#11
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/27900167/scat2-and-scat3-scores-at-baseline-and-after-sports-related-mild-brain-injury-concussion-qualitative-synthesis-with-weighted-means
#12
Roger E Thomas, Jorge Alves, Marcus M Vaska, Rosana Magalhães
OBJECTIVE: Identify all Sport Concussion Assessment Tool (SCAT2/3) studies, compare baseline and postconcussion results. DESIGN: Systematic review (qualitative synthesis, weighted means). DATA SOURCES: 18 databases, 9 grey literature resources searched for SCAT2/3 data; 9150 articles identified, titles/abstracts assessed/data-entry independently by two reviewers. ELIGIBILITY CRITERIA FOR SELECTING STUDIES: Any studies reporting partial/complete SCAT2/3 data...
2016: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/27895542/effect-of-tart-cherry-juice-on-recovery-and-next-day-performance-in-well-trained-water-polo-players
#13
Rachel McCormick, Peter Peeling, Martyn Binnie, Brian Dawson, Marc Sim
BACKGROUND: Tart Montmorency cherries contain high concentrations of phytochemicals and anthocyanins, which have recently been linked to improved athletic recovery and subsequent performance. To date however, previous work reporting promising results has focused on land-based endurance sports, with any potential benefits to team sports remaining unknown. As such, this investigation set-out to examine the effect of supplemental tart cherry juice (CJ) on recovery and next day athletic performance in highly-trained water-based team sport athletes over seven days...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27888818/high-altitude-illness
#14
Anna Hartman-Ksycińska, Jolanta Kluz-Zawadzka, Bogumił Lewandowski
High-altitude illness is a result of prolonged high-altitude exposure of unacclimatized individuals. The illness is seen in the form of acute mountain sickness (AMS) which if not treated leads to potentially life-threatening high altitude pulmonary oedema and high-altitude cerebral oedema. Medical problems are caused by hypobaric hypoxia stimulating hypoxia-inducible factor (HIF) release. As a result, the central nervous system, circulation and respiratory system function impairment occurs. The most important factor in AMS treatment is acclimatization, withdrawing further ascent and rest or beginning to descent; oxygen supplementation, and pharmacological intervention, and, if available, a portable hyperbaric chamber...
2016: Przegla̧d Epidemiologiczny
https://www.readbyqxmd.com/read/27882605/placebo-in-sports-nutrition-a-proof-of-principle-study-involving-caffeine-supplementation
#15
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/27856133/have-prohibition-policies-made-the-wrong-decision-a-critical-review-of-studies-investigating-the-effects-of-dmaa
#16
Matthew Dunn
In June 2012 DMAA (1,3-dimethylamylamine), an ephedrine-like vasoconstricting substance which had been included in many popular sports supplements, became a scheduled substance in Australia, following bans in several other countries. The underlying rationale for this ban was that DMAA use is unsafe. This paper aimed to critically review the available evidence on the acute and/or long-term harms of DMAA. Using five research databases (PubMed, Embase, ProQuest Health and Medical Complete, and Web of Science) and the key terms 'methylhexaneamine', 'DMAA', 'dimethylamylamine', '1,3-dimethylpentylamine' and '2-amino-4-methylhexane', 842 articles were identified once duplicates removed...
November 14, 2016: International Journal on Drug Policy
https://www.readbyqxmd.com/read/27852613/vitamin-c-enriched-gelatin-supplementation-before-intermittent-activity-augments-collagen-synthesis
#17
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/27824059/vitamin-d-deficiency-in-individuals-with-a-spinal-cord-injury-a-literature-review
#18
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
https://www.readbyqxmd.com/read/27822169/the-effect-of-six-days-of-dietary-nitrate-supplementation-on-performance-in-trained-crossfit-athletes
#19
Samuel J Kramer, Daniel A Baur, Maria T Spicer, Matthew D Vukovich, Michael J Ormsbee
BACKGROUND: While it is well established that dietary nitrate reduces the metabolic cost of exercise, recent evidence suggests this effect is maintained 24 h following the final nitrate dose when plasma nitrite levels have returned to baseline. In addition, acute dietary nitrate was recently reported to enhance peak power production. Our purpose was to examine whether chronic dietary nitrate supplementation enhanced peak power 24 h following the final dose and if this impacted performance in a heavily power-dependent sport...
2016: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/27818322/an-overview-of-herb-and-dietary-supplement-efficacy-safety-and-government-regulations-in-the-united-states-with-suggested-improvements-part-1-of-5-series
#20
REVIEW
Amy Christine Brown
This is the first of five review articles investigating dietary supplements (DS; includes herbs) that now exceed over 50,000 in the Office of Dietary Supplement's "Dietary Supplement Label Database." Four review articles follow summarizing published medical case reports of DS related to liver toxicity, kidney toxicity, heart toxicity, and cancer. The most popular DS were vitamin or mineral supplements (43%) followed by specialty supplements (20%), botanicals (20%; herbs), and sports supplements (16%). The 2013 Annual Report of the American Association of Poison Control Centers revealed 1692 fatalities due to drugs, and zero deaths due to DS...
November 3, 2016: Food and Chemical Toxicology
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