Creatine Supplementation

There is little benefit from cr ingestion for the

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Unformatted text preview: ce. There is little benefit from Cr ingestion for the prevention or suppression of muscle damage or soreness following muscular activity. When performance is assessed based on intensity and duration 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. With these concepts in mind, the focus of this paper is to summarise the effectiveness of Cr on specific performance outcomes rather than on proposed mechanisms of action. The last brief section of this review deals with the potential adverse effects of Cr supplementation. There appears to be no strong scientific evidence to support 108 Bemben & Lamont any adverse effects but it should be noted that there have been no studies to date that address the issue of long-term Cr usage. 1. Background The lure of possible enhanced sport performance or improved exercise potential continues to make dietary supplement products a very lucrative industry. One of the most utilised oral dietary supplements is creatine monohydrate (Cr). Cr ingestion at supra-physiological doses has become widespread and is no longer only being used by professional athletes or elite collegiate athletes. Many recreational exercisers, high-school athletes,[1] the elderly[2-5] and children[6] of both sexes have been ingesting Cr with the hope of improved physical performance. This review will provide a summary and evaluation of the most recent scientific literature (1999 to present) as it pertains to Cr supplementation and exercise or sport performance. 1.1 What is Creatine? Cr, a nonessential dietary compound, can either be ingested from exogenous sources such as fish or meat or can be produced endogenously by the body, primarily in the liver. Cr is synthesised by a two-step process involving three amino acids (arginine, glycine and methionine). Initially, arginine and glycine combine to form guanidinoacetate, then a methyl group from S-adenosylmethionine is added for the formation of C...
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This note was uploaded on 01/28/2014 for the course BI 231 taught by Professor Richardmay during the Fall '13 term at Southern Oregon.

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