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Sports Performance Supplement

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1841. Nutritional supplement practices in UK junior national track and field athletes. Full Text available with Trip Pro

in female athletes (75%) was higher than in males (55%) but was not statistically significant. No differences were found for age, training volume, or type of event. Seventeen different supplements were taken, with each athlete using an average of 2.4 products, multivitamins and minerals being the most popular. Reasons for using supplements were for health (45%), to enhance the immune system (40%), and to improve performance (25%). Of all respondents 48% believed they had an average knowledge (...) of supplements, but three quarters felt that they required further information. Those not using supplements were more likely to think supplements were associated with health risks than those taking them (p = 0.03). Most athletes (72%) have access to a sports dietician but underutilise this resource. Coaches (65%) had the greatest influence on supplementation practices, with doctors (25%) and sports dieticians (30%) being less important.Supplementation practices were widespread among the population studied

2005 British Journal of Sports Medicine

1842. Putting to rest the myth of creatine supplementation leading to muscle cramps and dehydration. (Abstract)

by media claims and anecdotal reports, that creatine supplementation can result in muscle cramps and dehydration. Although a number of published studies have refuted these claims, a recent position statement by the American College of Sports Medicine (ACSM) in 2000 advised individuals who are managing their weight and exercising intensely or in hot environments to avoid creatine supplementation. Recent reports now suggest that creatine may enhance performance in hot and/or humid conditions (...) Putting to rest the myth of creatine supplementation leading to muscle cramps and dehydration. Creatine is one of the most popular athletic supplements with sales surpassing 400 million dollars in 2004. Due to the popularity and efficacy of creatine supplementation over 200 studies have examined the effects of creatine on athletic performance. Despite the abundance of research suggesting the effectiveness and safety of creatine, a fallacy appears to exist among the general public, driven

2008 British Journal of Sports Medicine

1843. [Use of natural vitamin supplements in children during convalescence and in children with athletic activities]. (Abstract)

[Use of natural vitamin supplements in children during convalescence and in children with athletic activities]. Sporting activities and periods of convalescence call for an added intake of nutrients in children. This study aimed to evaluate the effect of a natural vitamin supplement on diet, food intake, body composition and muscular strength in children during convalescence and in children practising sports.A comparative study was performed in two different groups of subjects: 20 children aged (...) between 6 and 12 years old during convalescence following infections of upper airways, and 20 9-year-old children forming part of a football team. All subjects were randomly subdivided into two groups who were respectively given a vitamin supplement (Vitality Roeder 2000 Junior) or a placebo for 4 weeks. Weight, body composition using and muscolar strength using dynamometer measured before and after the study and a food diary was kept for 3 days before each visit.No significant differences in body

1999 Minerva pediatrica Controlled trial quality: uncertain

1844. Effects of zinc supplementation on blood rheology during exercise. (Abstract)

Effects of zinc supplementation on blood rheology during exercise. We previously reported a higher blood viscosity at corrected hematocrit (45%) (explained by a higher value of erythrocyte rigidity) in football players with low serum zinc (Zn) and thus presumably Zn deficiency; subjects with low serum zinc had also an impairment in performance. This interventional study was undertaken in order to assess the effects of zinc supplementation (compared to placebo) on blood rheology and performance (...) either at rest or during exercise. Ten male healthy volunteers (age: 26+/-1.3 yr; weight 67.9+/-2.24 kg; height 177+/-3 cm) received at random order either zinc (20 mg/day) and placebo, according to a double blind cross-over procedure, during seven days. In each case on the eighth day they performed a 25 min submaximal exercise-test. At rest blood viscosity at corrected hematocrit 45% (gamma = 1000 s(-1)) was lower after Zn (3.56+/-0.14 vs. 4.13+/-0.16 mPa.s, p = 0.009), explained by a lower RBC

1999 Clinical hemorheology and microcirculation Controlled trial quality: uncertain

1845. Effects of high dose oral creatine supplementation on anaerobic capacity of elite wrestlers. (Abstract)

Effects of high dose oral creatine supplementation on anaerobic capacity of elite wrestlers. The purpose of this study was to investigate the effect of high dose oral creatine supplementation on anaerobic capacity of elite wrestlers.comparative randomized design.Wingate anaerobic tests of the participants were taken at the Human Performance Laboratory of the Department of Physical Education and Sports in The Middle East Technical University, Ankara, Turkey.20 active international level (...) wrestlers participated (22 to 27 years old).the daily dosage of creatine or placebo was divided into 4 equal amounts (5 gx4 = 20 g). Every 5 g of supplement was dissolved in 250 ml water and it was given to participants 1 hour before breakfast, lunch, dinner, and workout session.subjects underwent a 30-s Wingate Anaerobic tests until exhaustion in pre- and post-tests. After the pretest measurements were completed, participants were classified as creatine (Cr., n=10) and placebo (Pl., n=10) groups

2003 The Journal of sports medicine and physical fitness Controlled trial quality: uncertain

1846. Efficacy of a Tea Catechin Sports Drink for Enhancing Exercise-Induced Fat Loss

Information provided by: Provident Clinical Research Study Details Study Description Go to Brief Summary: The primary objective of this trial is to evaluate the influence of consuming a tea catechin containing sports beverage on body fat mass during exercise-induced weight loss among overweight and obese men and women. Condition or disease Intervention/treatment Overweight Obesity Dietary Supplement: 500 mL/day of a beverage providing approximately 625 mg catechins Other: Control beverage matched (...) by the National Library of Medicine related topics: available for: Groups and Cohorts Go to Group/Cohort Intervention/treatment Active Tea catechin sport beverage Dietary Supplement: 500 mL/day of a beverage providing approximately 625 mg catechins Subjects were asked to consume 500 mL/day of a beverage providing approximately 625 mg catechins Control Control beverage Other: Control beverage matched for energy and caffeine content 500 mL/day of a control beverage Outcome Measures Go to Primary Outcome

2008 Clinical Trials

1847. Drugs and Sport

in that sport. If the doctor is at fault, there is potential for litigation irrespective of whether the individual is an amateur or professional competitor. To enhance performance : in doing so this could give an unfair advantage. The GMC's stance on this is unequivocal: GMC guidance Doctors who prescribe or collude in the provision of drugs or treatment with the intention of improperly enhancing an individual's performance in sport would be contravening the GMC's guidance and such actions would usually (...) may also be visited by representatives from their governing body for out-of-season testing. Some drugs are permissible when a sportsperson is not competing but not permissible during competition. Others, such as anabolic steroids are banned at all times. Some drugs are banned in some sports but not in others. Banned substances can include alcohol and caffeine above a certain level. Beta-blockers would impair performance of an endurance athlete but suppression of tremor gives unfair advantage

2008 Mentor

1848. Physical exercise or micronutrient supplementation for the wellbeing of the frail elderly? A randomised controlled trial. Full Text available with Trip Pro

Physical exercise or micronutrient supplementation for the wellbeing of the frail elderly? A randomised controlled trial. Physical exercise or micronutrien... preview & related info | Mendeley Papers People Groups Search Search Search Journal Article Physical exercise or micronutrient supplementation for the wellbeing of the frail elderly? A randomised controlled trial. MJM C N D EG S et al. See more British Journal of Sports Medicine (2002) 36(2) 126-131 ISSN: N/A Citations Citations (...) term interventions. Author supplied keywords Cite CITATION STYLE APA MJM, C. A. P., N, de J., EG, S., WA, van S., & FJ, K. (2002). Physical exercise or micronutrient supplementation for the wellbeing of the frail elderly? A randomised controlled trial. British Journal of Sports Medicine , 36 (2), 126–131. Retrieved from http://search.ebscohost.com/login.aspx?direct=true&AuthType=ip,shib&db=jlh&AN=106963377&site=ehost-live&scope=site Register to see more suggestions Mendeley helps you to discover

2002 British Journal of Sports Medicine Controlled trial quality: uncertain

1849. What is the evidence for creatine supplementation in improving athletic performance?

fatigue. Some evidence suggests creatine is effective at increasing work performed in a short maximal effort (eg, sprinting, weightlifting).” [1] Our search in the TRIP and Medline databases identified two review articles on creatine supplementation and exercise or sports performance. The first of these reviews, undertaken in 2005, states: “…This paper focuses on research articles that have been published since 1999… It is hypothesised that Cr can act though a number of possible mechanisms (...) of the exercises, there is contradictory evidence relative to both continuous and intermittent endurance activities. However, activities that involve jumping, sprinting or cycling generally show improved sport performance following Cr ingestion…” [1] Krieder examines the ‘potential ergogenic value of creatine supplementation on exercise performance and training adaptations’. “[A] review of the literature indicates that over 500 research studies have evaluated the effects of creatine supplementation on muscle

2007 TRIP Answers

1850. Little effect of caffeine ingestion on repeated sprints in team-sport athletes. (Abstract)

performed within 10 s and followed by rest for the remainder of each 10 s. The caffeine and placebo trials followed a familiarization trial, and the time between consecutive trials was 2-3 d. To allow estimation of variation in treatment effects between individuals, nine subjects performed three more trials without a supplement 7-14 d later. We estimated the smallest worthwhile effect on sprint time in a team sport to be approximately 0.8%.Mean time to complete 10 sprints increased by 0.1% (95% likely (...) Little effect of caffeine ingestion on repeated sprints in team-sport athletes. The effect of caffeine ingestion on sprint performance is unclear. We have therefore investigated its effect on performance in a test that simulates the repeated sprints of team sports.In a randomized double-blind crossover experiment, 16 male team-sport athletes ingested either caffeine (6 mg.kg-1 of body mass) or a placebo 60 min before performing a repeated 20-m sprint test. The test consisted of 10 sprints, each

2001 Medicine and science in sports and exercise Controlled trial quality: predicted high

1851. Creatine supplementation and multiple sprint running performance. (Abstract)

(p > 0.05) between-group differences in multiple sprint measures of fastest time, mean time, fatigue, or posttest blood lactate concentration. Despite widespread use as an ergogenic aid in sport, the results of this study suggest that creatine monohydrate supplementation conveys no benefit to multiple sprint running performance. (...) Creatine supplementation and multiple sprint running performance. The aim of this study was to examine the effects of short-term creatine monohydrate supplementation on multiple sprint running performance. Using a double-blind research design, 42 physically active men completed a series of 3 indoor multiple sprint running trials (15 x 30 m repeated at 35-second intervals). After the first 2 trials (familiarization and baseline), subjects were matched for fatigue score before being randomly

2006 Journal of strength and conditioning research / National Strength & Conditioning Association Controlled trial quality: uncertain

1852. Creatine supplementation and performance in 6 consecutive 60 meter sprints. (Abstract)

Creatine supplementation and performance in 6 consecutive 60 meter sprints. Creatine is an ergogenic aid used in individual and team sports. The aim of this study is to analyze the effect of monohydrate creatine supplementation on physical performance during 6 consecutive maximal speed 60 meter races, and the changes induced in some characteristic biochemical and ventilatory parameters. The study was carried out on nineteen healthy and physically active male volunteers, and randomly distributed (...) into two groups: Group C received a supplement of creatine monohydrate (20 g/day for 5 days) and group P received placebo. Tests were performed before and after supplementation. No significant changes were observed in weight or body water measured by bioimpedance or the sum of 7 skinfold or performance during the 60 meter races. Group C showed a statistically significant increase in plasma creatinine from 69.8 +/- 12.4 to 89.3 +/- 12.4 micromol x L(-1) (p<0.05). In group C in the second control day

2004 Journal of physiology and biochemistry Controlled trial quality: uncertain

1853. Caffeine supplementation and multiple sprint running performance. Full Text available with Trip Pro

Caffeine supplementation and multiple sprint running performance. The aim of this study was to examine the effects of caffeine supplementation on multiple sprint running performance.Using a randomized double-blind research design, 21 physically active men ingested a gelatin capsule containing either caffeine (5 mg x kg(-1) body mass) or placebo (maltodextrin) 1 h before completing an indoor multiple sprint running trial (12 x 30 m; repeated at 35-s intervals). Venous blood samples were drawn (...) sprint work requires further investigation, the results of the present study show that caffeine has ergogenic properties with the potential to benefit performance in both single and multiple sprint sports.

2008 Medicine and science in sports and exercise Controlled trial quality: uncertain

1854. Carbohydrate-supplement form and exercise performance. (Abstract)

Carbohydrate-supplement form and exercise performance. Numerous studies have shown that ingesting carbohydrate in the form of a drink can improve exercise performance by maintaining blood glucose levels and sparing endogenous glycogen stores. The effectiveness of carbohydrate gels or jellybeans in improving endurance performance has not been examined. On 4 separate days and 1-2 hr after a standardized meal, 16 male (8; 35.8 +/- 2.5 yr) and female (8; 32.4 +/- 2.4 yr) athletes cycled at 75% VO (...) (2peak) for 80 min followed by a 10-km time trial. Participants consumed isocaloric (0.6 g of carbohydrate per kg per hour) amounts of randomly assigned sports beans, sports drink, gel, or water only, before, during, and after exercise. Blood glucose concentrations were similar at rest between treatments and decreased significantly during exercise with the water trial only. Blood glucose concentrations for all carbohydrate supplements were significantly, p < .05, higher than water during the 80-min

2008 International journal of sport nutrition and exercise metabolism Controlled trial quality: uncertain

1855. Effect of caffeine supplementation on repeated sprint running performance. (Abstract)

Effect of caffeine supplementation on repeated sprint running performance. This study examined the effects of 6 mgxkg(-1) caffeine ingestion in team-sport players (N.=10) on repeated-sprint running performance (5 sets of 6 x 20 m) and reaction times, 60 min after caffeine or placebo ingestion.Best single sprint and total set sprint times, blood lactate and simple and choice reaction times (RT) were measured.Total sprint times across sets 1, 3 and 5 (departure every 25 s) were significantly (...) RT, although effect sizes suggested improved post-exercise times after caffeine.Caffeine ingestion 60 min prior to exercise can enhance repeated sprint running performance and is not detrimental to reaction times.

2008 The Journal of sports medicine and physical fitness Controlled trial quality: uncertain

1856. 4. The use and misuse of performance-enhancing substances in sport. (Abstract)

4. The use and misuse of performance-enhancing substances in sport. Doctors need to know if a patient is an athlete subject to drug testing, and to be aware of the legal situation surrounding drugs they prescribe such patients. Antidoping laws generally exist in order to provide a safe and fair environment for participation in sport. These laws should prevent and protect athletes from subjecting themselves to health risks through the use of unsafe, but performance-enhancing drugs. Because (...) of difficulties in proving intent to cheat, the World Anti-Doping Agency enforces a principle of strict liability for positive test results for banned substances. An area of major controversy with respect to liability is the "sports supplement" industry, which is poorly regulated when compared with prescription drugs yet is a potential source of doping violations. Medical practitioners can be found guilty of anti-doping violations if they traffic banned drugs, prescribe these to athletes or otherwise assist

2006 Medical Journal of Australia

1857. Cardiovascular toxicities of performance-enhancing substances in sports. Full Text available with Trip Pro

Cardiovascular toxicities of performance-enhancing substances in sports. Athletes commonly use drugs and dietary supplements to improve athletic performance or to assist with weight loss. Some of these substances are obtainable by prescription or by illegal means; others are marketed as supplements, vitamins, or minerals. Nutritional supplements are protected from Food and Drug Administration regulation by the 1994 US Dietary Supplement Health and Education Act, and manufacturers (...) are not required to demonstrate proof of efficacy or safety. Furthermore, the Food and Drug Administration lacks a regulatory body to evaluate such products for purity. Existing scientific data, which consist of case reports and clinical observations, describe serious cardiovascular adverse effects from use of performance-enhancing substances, including sudden death. Although mounting evidence led to the recent ban of ephedra (ma huang), other performance-enhancing substances continue to be used frequently

2005 Mayo Clinic Proceedings

1858. Phospholipids and sports performance Full Text available with Trip Pro

exercise has been shown to reduce circulatory choline concentrations in some individuals. As choline is a pre-cursor to the neurotransmitter Acetylcholine, this finding has encouraged researchers to investigate the hypothesis that supplementation with PC (or choline salts) could enhance sporting performance. Although the available data that evaluates the effects of PC supplementation on performance are equivocal, acute oral supplementation with PC (~0.2 g PC per kg body mass) has been demonstrated (...) to improve performance in a variety of sporting activities where exercise has depleted circulatory choline concentrations. Short term oral supplementation with soy-derived PS (S-PS) has been reported to attenuate circulating cortisol concentrations, improve perceived well-being, and reduce perceived muscle soreness after exercise. More recently, short term oral supplementation (750 mg per day of S-PS for 10 days) has been demonstrated to improve exercise capacity during high intensity cycling and tended

2007 Journal of the International Society of Sports Nutrition

1859. Creatine serum is not as effective as creatine powder for improving cycle sprint performance in competitive male team-sport athletes. (Abstract)

Creatine serum is not as effective as creatine powder for improving cycle sprint performance in competitive male team-sport athletes. This study examined the effects of supplementation with either creatine monohydrate powder in solution (CP) or a widely available creatine serum (CS) on performance in a repeated maximal sprint cycling test (10 x 6 seconds, 24-second passive rest between sprints). Using a randomized, double-blind, crossover design, 11 competitive male athletes supplemented (...) with creatine in 2 forms according to the manufacturer's recommendations on 2 separate occasions. The 2 supplementation protocols were (a) 20 g.day(-1) x 6 days of creatine powder in solution plus a placebo serum (CP) or (b) 5 ml.day(-1) x 6 days of creatine serum plus a placebo powder (CS). Subjects completed 2 familiarization trials before the 6-day supplementation period. A repeated maximal sprint cycling test was performed prior to and immediately postsupplementation. A 7-week washout period separated

2004 Journal of strength and conditioning research / National Strength & Conditioning Association Controlled trial quality: uncertain

1860. Positive short-term subjective effect of sports drink supplementation during recovery. (Abstract)

Positive short-term subjective effect of sports drink supplementation during recovery. The aim of this study was to investigate the effects of a naturally composed sports drink containing proteins and carbohydrates used during recovery in competitive badminton players. The hypothesis was that the use of a recovery drink would lead to positive subjective effects, enhanced physical performance and less signs of overtraining.During an in-door season 18 badminton players were instructed to drink (...) with a sports drink during recovery showed a significant short-term subjective positive effect compared with placebo. However, no effects were seen on physical performance or signs of overtraining.

2006 The Journal of sports medicine and physical fitness Controlled trial quality: uncertain

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