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The effect of whey isolate and resistance training on strength, body composition and plasma glutamine

Citation

Cribb, PJ and Williams, AD and Hayes, A and Carey, MF, The effect of whey isolate and resistance training on strength, body composition and plasma glutamine, International Journal of Sports Nutrition and Exercise Metabolism, 16, (5) pp. 494-509. ISSN 1526-484X (2006) [Refereed Article]

DOI: doi:10.1123/ijsnem.16.5.494

Abstract

Different dietary proteins affect whole body protein anabolism and accretion and therefore, have the potential to influence results obtained from resistance training. This study examined the effects of supplementation with two proteins, hydrolyzed whey isolate (WI) and casein (C), on strength, body composition, and plasma glutamine levels during a 10 wk, supervised resistance training program. In a double-blind protocol, 13 male, recreational bodybuilders supplemented their normal diet with either WI or C (1.5 gm/kg body wt/d) for the duration of the program. Strength was assessed by 1-RM in three exercises (barbell bench press, squat, and cable pull-down). Body composition was assessed by dual energy X-ray absorptiometry. Plasma glutamine levels were determined by the enzymatic method with spectrophotometric detection. All assessments occurred in the week before and the week following 10 wk of training. Plasma glutamine levels did not change in either supplement group following the intervention. The WI group achieved a significantly greater gain (P < 0.01) in lean mass than the C group (5.0 ± 0.3 vs. 0.8 ± 0.4 kg for WI and C, respectively) and a significant (P < 0.05) change in fat mass (-1.5 ± 0.5 kg) compared to the C group (+0.2 ± 0.3 kg). The WI group also achieved significantly greater (P < 0.05) improvements in strength compared to the C group in each assessment of strength. When the strength changes were expressed relative to body weight, the WI group still achieved significantly greater (P < 0.05) improvements in strength compared to the C group. © 2006 Human Kinetics, Inc.

Item Details

Item Type:Refereed Article
Research Division:Medical and Health Sciences
Research Group:Human Movement and Sports Science
Research Field:Exercise Physiology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Environmental Sciences
Author:Williams, AD (Associate Professor Andrew Williams)
ID Code:41217
Year Published:2006
Web of Science® Times Cited:94
Deposited By:Health Sciences A
Deposited On:2007-07-31
Last Modified:2007-07-31
Downloads:0

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