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Interrelationship between physical activity and branched-chain amino acids.
1School of Sport and Exercise Sciences, Loughborough University, Leicestershire, England, UK. m.gleeson@iboro.ac.uk
The Journal of Nutrition
|June 3, 2005
Summary
Branched-chain amino acid (BCAA) supplements show no performance benefits for athletes. Scientific evidence does not support claims of muscle protection or faster repair from BCAA supplementation during exercise.
Area of Science:
- Sports Nutrition
- Exercise Physiology
- Biochemistry
Background:
- Athletes often consume high amounts of branched-chain amino acids (BCAAs) through diet and supplements.
- Endurance athletes may have higher protein requirements due to increased BCAA oxidation during exercise.
Purpose of the Study:
- To evaluate the scientific evidence for performance-enhancing and anticatabolic effects of BCAA supplementation in athletes.
- To assess the validity of commercial claims regarding BCAA supplements.
Main Methods:
- Review of scientific literature on BCAA administration (oral, infusion) with and without carbohydrates.
- Analysis of studies investigating BCAA effects on exercise performance, muscle damage repair, and anticatabolism.
Main Results:
- The majority of studies failed to demonstrate a performance-enhancing effect of BCAAs.
- No valid scientific evidence supports claims that BCAAs offer anticatabolic effects or accelerate muscle repair post-exercise.
Conclusions:
- Current scientific evidence does not support the use of BCAA supplements for improving athletic performance or recovery.
- Recommended protein intakes for athletes are safe, and acute BCAA supplement intake (10-30 g/d) appears harmless, but lacks strong scientific backing for claimed benefits.