Athletes use a variety of nutritional ergogenic aids to enhance performance. Most nutritional aids can be categorized as a potential energy source: carbohydrates, protein and amino acid, dietary antioxidants, such as vitamins C and E and carotenes, creatine, caffeine. The effects of this ergogenic aids are discussed. see also: http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10362455&dopt=Abstract
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