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

Cribb, Paul J and Williams, Andrew D and Carey, Michael F and Hayes, Alan (2006) The effect of whey isolate and resistance training on strength, body composition and plasma glutamine. International journal of sport nutrition & exercise metabolism, 16 (5). pp. 494-509. ISSN 1526484x

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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.

Item Type: Article
Uncontrolled Keywords: adipose tissue, adult, body composition, caseins, dietary proteins, dietary supplements, double-blind method, glutamine, humans, male, milk proteins, muscle strength, muscle, skeletal, weight lifting
Subjects: RFCD Classification > 320000 Medical and Health Sciences
Faculty/School/Research Centre/Department > School of Biomedical and Health Sciences
Depositing User: Ms Phung T Tran
Date Deposited: 10 Nov 2008 22:36
Last Modified: 13 Jul 2011 01:25
URI: http://vuir.vu.edu.au/id/eprint/1610
DOI: AN:23221195
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Citations in Scopus: 58 - View on Scopus

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