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The effects of 8 weeks of heavy resistance training and branched-chain amino acid supplementation on body composition and muscle performance

Purpose

This study determined the effects of eight weeks of heavy resistance training combined with branched-chain amino acid (BCAA) supplementation on body composition and muscle performance.

Methods

Nineteen non-resistance-trained males resistance-trained (3 sets of 8-10 repetitions) four times/week for eight weeks while also ingesting 9 g/day of BCAA or 9 g/day of placebo (PLAC) on exercise days only (half of total dose 30 min before and after exercise). Data were analyzed with separate 2 x 2 ANOVA (p < 0.05).

Results

For total body mass, neither group significantly increased with training (p = 0.593), and there also were no significant changes in total body water (p = 0.517). Also, no training- or supplement-induced (p = 0.783) changes occurred with fat mass or fat-free mass (p = 0.907). Upper-body (p = 0.047) and lower-body strength (p = 0.044) and upper- (p = 0.001) and lower-body muscle endurance (p = 0.013) were increased with training; however, these increases were not different between groups (p > 0.05).

Conclusion

When combined with heavy resistance training for eight weeks, 9 g/day of BCAA supplementation, half given 30 min before and after exercise, had no preferential effects on body composition and muscle performance.

Author information

Correspondence to Mike Spillane.

Rights and permissions

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Keywords

  • Public Health
  • Placebo
  • Body Water
  • Body Composition
  • Sport Medicine