ABSTRACT
Many scientific publications have explored the roles of protein in the support of exercise performance and adaptation to the stresses of training. Along with this focus on the role of protein in general, many studies have been conducted about the functions and effects on performance of supplementation with specific amino acids (AAs). Perhaps more questions were raised than were answered by the many studies on the subject of AAs in sports published during the 20th century, and such research continues actively into the 21st century. Most of the research has been conducted on the branched-chain amino acids (BCAAs), glutamine, and ARG. Several of the other AAs are being studied for potential functions that may support sports
performance. Also, since many AAs have complementary functions, AA mixtures are being actively studied for their potential to enhance exercise performance and adaptation to exercise stress.
