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The effects of creatine supplementation on muscular performance and body composition responses to short-term resistance training overreaching

Citation

Volek, JS and Ratamess, NA and Rubin, MR and Gomez, AL and French, DN and McGuigan, MR and Scheett, TP and Sharman, MJ and Hakkinen, K and Kraemer, WJ, The effects of creatine supplementation on muscular performance and body composition responses to short-term resistance training overreaching, European Journal of Applied Physiology, 91, (5-6) pp. 628-37. ISSN 1439-6319 (2004) [Refereed Article]


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Copyright Statement

Copyright 2003 Springer-Verlag 2003

DOI: doi:10.1007/s00421-003-1031-z

Abstract

To determine the effects of creatine supplementation during short-term resistance training overreaching on performance, body composition, and resting hormone concentrations, 17 men were randomly assigned to supplement with 0.3 g/kg per day of creatine monohydrate (CrM: n = 9) or placebo (P: n = 8) while performing resistance exercise (5 days/week for 4 weeks) followed by a 2-week taper phase. Maximal squat and bench press and explosive power in the bench press were reduced during the initial weeks of training in P but not CrM. Explosive power in the bench press, body mass, and lean body mass (LBM) in the legs were augmented to a greater extent in CrM (P ≤ 0.05) by the end of the 6-week period. A tendency for greater 1-RM squat improvement (P = 0.09) was also observed in CrM. Total testosterone (TT) and the free androgen index (TT/SHBG) decreased in CrM and P, reaching a nadir at week 3, whereas sex hormone binding globulin (SHBG) responded in an opposite direction. Cortisol significantly increased after week 1 in CrM (+29%), and returned to baseline at week 2. Insulin was significantly depressed at week 1 (-24%) and drifted back toward baseline during weeks 2-4. Growth hormone and IGF-I levels were not affected. Therefore, some measures of muscular performance and body composition are enhanced to a greater extent following the rebound phase of short-term resistance training overreaching with creatine supplementation and these changes are not related to changes in circulating hormone concentrations obtained in the resting, postabsorptive state. In addition, creatine supplementation appears to be effective for maintaining muscular performance during the initial phase of high-volume resistance training overreaching that otherwise results in small performance decrements.

Item Details

Item Type:Refereed Article
Keywords:cortisol, muscle strength, overtraining, power, testosterone, weight training
Research Division:Medical and Health Sciences
Research Group:Human Movement and Sports Science
Research Field:Exercise Physiology
Objective Division:Health
Objective Group:Health and Support Services
Objective Field:Health and Support Services not elsewhere classified
Author:Sharman, MJ (Dr Matt Sharman)
ID Code:79057
Year Published:2004
Web of Science® Times Cited:31
Deposited By:Health Sciences A
Deposited On:2012-08-15
Last Modified:2012-10-29
Downloads:5 View Download Statistics

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