Branch chain amino acids (BCAA) leads to prolong exercise during heat stress in both men and women,Test X 360 says study finds. To determine the efficacy of BCAA supplementation on performance endurance, two trials consisting of six women and seven men were subjected in exercise to exhaustion and rest in heat. The conclusion of the study that appeared in Medicine & Science in Sports & Exercise pointed out that the time from cycling to exhaustion was increased in both sexes and that supplementation with BCAA resulted in prolong moderate exercises.