BCAA (Branched Chain Amino Acids) is actually a collective term for three kinds of amino acids: leucine, valine and isoleucine. It is an essential amino acid for the human body and a necessary product for supporting muscles. Let’s look at an experiment first. In a 4-week study in Japan, researchers gave rats supplemented with branched-chain amino acids or placebo, and then let the rats keep exercising until they were exhausted. After the experiment, it was found that the liver and skeletal muscle of the mice supplemented with BCAA exhibited glycogen storage saving performance during exercise. This means that BCAA allows you to train at higher intensity for longer.
Other studies have also shown that when BCAA is taken during aerobic exercise, it means that the rate of net protein degradation has decreased. Equally important, BCAA can delay muscle glycogen depletion before and during exhaustive aerobic exercise.