BCAA's make up over one third of muscle protein. Studies have shown that exercise directly increases degradation and subsequent excretion of the BCAA's from muscle tissue. The BCAA's provide the building materials for the nonessential amino acids alanine and glutamine (the most prevalent free amino acid in muscle) which are abundantly released from muscle following exercise.
Among the most beneficial and effective supplements in any sports nutrition program are branched chain amino acids. These are the essential amino leucine, isoleucine, and valine. Although these supplements have been around for a long time and the scientific understanding in the exercise performance benefits of BCAA supplementation is rich many people don't know exactly how they exert their effects or how and when to use them properly.
So how do BCAA’s work? During intense weight training the body is normally in a highly catabolic condition. At this time glycogen stores are being rapidly depleted and the liver in turn must synthesize glucose by a conversion of L-Alanine. Alanine along with Glutamine make up over half of the amino acid content released from muscles during exercise. Glutamine is released from the muscles not only from free form amino acid stores but also through deamination of the Branch Chain Amino Acids within the muscles themselves. The release of Glutamine is generally recognized as the signal to the body to stop protein syntheses in the muscles, especially during times of stress. Providing Glutamine and the Branch Chain Amino Acids, especially during those times of stress may profoundly affect this signal and allow protein synthesis to continue onward. Following intense weight training the proper recovery process requires an abundance of the specific amino acids which are affected the most by training, ie: the Glutamine and Branch Chain Amino Acids.