Ergogenic Aids - Dietary Supplements.ppt

1、Ergogenic Aids - Dietary Supplements,Assembled by the IHSA Sports Medicine Advisory Committee,Ergogenic Aids,Any substance taken to enhance athletic performance.These substances include dietary supplements which may be legal or illegal.,Dietary Supplements,Products intended to supplement the diet th

2、at contain at least one dietary ingredient to include: Vitamins Minerals Herbs or other botanicals Amino acids and substances such as enzymes, organ tissues, glandulars, and metabolites,Dietary Supplements,These products are taken by mouth.These products are found in many forms to include: Tablets C

3、apsules Softgels Gelcaps Liquids Powders Bars,Dietary Supplement Health and Education Act 1994,As a result of this act,dietary supplements are no longer regulated as foods and are not subject to pre-market safety evaluations.,Dietary Supplement Health and Education Act 1994,The product must be label

4、ed as a dietary supplement.Information on the product label must not represent the product as a conventional food or a sole item of a meal or diet.,Dietary Supplement Health and Education Act 1994,Allows for product labeling claims as long as it does not diagnose, prevent, treat or cure a specific d

5、isease.While the statements must be truthful and not misleading, there is not a review/approval process by the FDA.,Dietary Supplement Health and Education Act 1994,The manufacturer is responsible to ensure the product is safe.Manufacturers/distributors are not required to record, investigate or for

6、ward to the FDA any reports of injuries or illnesses that may be related to use of their product.,Anabolic Steroid Control Act of 2004,Expands the definition of anabolic steroids to include any drug or hormonal substance, chemically and pharmacologically related to testosterone. (other than estrogen

7、s, progestins, corticosteroids, and dehydroepiandrosterone) This includes androstenediol and androstenedione.,General Concerns,Without regulatory control there is a buyer beware market Dietary supplement advertisements can be misleading and deceptive Claims of effectiveness may not be credible The c

8、oncentration and quality of active ingredients can differ from product to product,Green, 2001; Geyer, 2004,Analysis of Dietary Supplements,Study of 12 brands 11/12 contained 110% of amount listed on label 5/12 contained at least one ingredient not listed on label 2/12 were missing at least one ingre

9、dient listed on label Study of 240 supplements 18.8% contained steroids or pro-hormones not listed on label,General Concerns,Dietary supplements may adversely interact with each other as well as prescription medications.Dietary supplements are often utilized as a short cut to optimal nutritional pra

10、ctices.,Research Concerns,There is a lack of quality peer reviewed research on human subjects.The high dosages, utilized by athletes, have not been well studied.The long term side effects are not well studied, if at all. Research has not been equally completed on men, women and adolescents.,Protein,

11、Background: Proteins are linked amino acids that occur naturally in foods Example foods that contain protein include: meats, fish, poultry, milk, soybeans Protein supplementation can include: powders, shakes and bars,Protein,Claims include: Improved muscle growth and function Increased weight gain I

12、ncreased lean muscle mass Increased strength/power,Protein,Potential side effects: High protein intake may displace carbohydrate in the diet possibly affecting performance Increased urinary calcium loss Contribute to dehydration Due to the stress on the kidneys, individuals with kidney disease shoul

13、d avoid high protein diets,Protein,Research findings: The protein requirement in athletes is higher than non-athletes. Most research studies do not support supplementation as having a positive effect on muscle size and function. Research may be affected by the fact that most athletes consume levels

14、of protein that exceed recommended amounts.,Protein,Legal status: Is a legal substance Is not banned by sports governing bodies,Creatine,Background: Naturally occurring compound derived from amino acids Found in meat and fish Creatine supplementation can include: powder, candy gum, tablets and gel,C

15、reatine,Claims include: Increase lean body mass Increase maximal energy production/performance (short duration high intensity exercises example sprints) Delayed fatigue in workouts/competition Improved recovery after workouts/competition,Creatine,Potential side effects: Increased body weight Suspect

16、ed to be from water weight Gastrointestinal upset Upset stomach Diarrhea Nausea Muscle cramping and strains,Creatine,Potential side effects: Dehydration Possible kidney effects/overload,Creatine,Research findings: Research is not unanimous; however, creatine appears to be beneficial in short duratio

17、n high intensity exercise (sprints/football/volleyball)Has not been found to benefit aerobic exercise or oxygen carrying capacity (endurance activities example 800/1600 meter run)People with low to normal creatine stores respond better with supplementation than those with normal to high stores,Creat

18、ine,Legal status: Is a legal substance Is not banned by sports governing bodies,HMB,Background: HMB is derived in the breakdown of the essential amino acid leucine Found in some foods such as citrus fruit and catfish HMB is not an essential nutrient The function of HMB is not fully understood Though

19、t to limit protein breakdown during activity,HMB,Claims Include: Increased muscle mass Increased strength Enhancement of physical appearance,HMB,Potential Side Effects: There does not appear to be any side effects with short tem utilization of HMB There is limited research on the side effects of HMB

20、,HMB,Research Findings: Research is limited HMB supplementation may limit exercise induced muscle damage/protein breakdown. While there has been some improvement in strength and body composition the data is limited and further research is needed to determine any ergogenic benefit of HMB.,HMB,Legal S

21、tatus: Is a legal substance,Androstenedione - DHEA,Background: Weak anabolic-androgenic steroid hormones produced by the gonads and adrenal glands Is a precursor to testosterone Used by athletes based on the effectiveness of testosterone,Androstenedione - DHEA,Claims include: Increase muscle size/ma

22、ss Increase lean body mass Increase muscle strength,Androstenedione - DHEA,Potential side effects: Dependent on the dosage and testosterone levels the potential side effects are the same as anabolic-androgenic steroids,Androstenedione - DHEA,Potential side effects: Due to increased estrogen levels m

23、ales are associated with gynecomastia (breast become bigger) as well as other feminizing side effectsIncreased cardiovascular disease risk Liver damage/cancer,Androstenedione - DHEA,Potential side effects: Women risk virilization (male secondary sex characteristics) Children have been associated wit

24、h premature growth plate closure leading to diminished height as well as virilization (male secondary sex characteristics),Androstenedione - DHEA,Research Findings: Do not support the notion that testosterone concentration increased with supplementation Not shown to increase muscle size/strength or

25、be an ergogenic aid,Androstendione - DHEA,Legal Status: Androstenedione Is a illegal substance Legal status: DHEA Is a legal substance Is banned by the IOC, NCAA, USCO/USADA,Dietary Supplements,This presentation highlights only a few of the several dietary supplements available.Remember quality rese

26、arch is lacking on the effectiveness and side effects of dietary supplements.As shown, utilization of dietary supplements is a buyer beware market as you are not guaranteed to get the ingredients that you purchased or you may get ingredients that you do not want.,Alternatives to Supplementation,Appr

27、opriate diet and nutritional practices.Appropriate weight training and conditioning.Appropriate rest and recovery.Appropriate goal setting.,Reliable resources,National Institute on Drug Abuse www.nida.nih.gov National Center for Drug-Free Sport World Anti-Doping Agency www.wada-ama.org Internationa

28、l Olympic Committee (IOC) www.olympic.org National Collegiate Athletic Association (NCAA) www.ncaa.org Taylor Hooten Foundation www.taylorhooten.org FDA Center for Food Safety and Applied Nutrition www.cfsan.fda.gov NIH Office of Dietary Supplements www.ods.od.nih.gov National Center for Complementary & Alternative Medicine www.nccam.nih.gov Tufts Nutrition Navigator (Critical review of supplement web sites) www.navigator.tufts.edu United States Anti-Doping Agency www.usantidoping.org/,