What is one of the primary functions of BCAAs during exercise?

During exercise, one of the primary functions of branched-chain amino acids (BCAAs) is to donate amino groups to form glucose, a process known as gluconeogenesis. BCAAs, which include leucine, isoleucine, and valine, can be utilized by the muscles during prolonged physical activity, particularly when glycogen stores are low. This process helps maintain energy levels by providing an alternative source of glucose for energy production, especially during endurance activities.

This utilization of BCAAs supports the body’s energy demands and helps preserve muscle tissue by reducing protein breakdown. When the body is under stress from exercise, it may initiate gluconeogenesis to ensure that there are sufficient energy substrates available, particularly during longer or more intense bouts of exercise. Thus, the role of BCAAs in donating amino groups for glucose formation is crucial in maintaining performance and mitigating fatigue.

In comparison, options that suggest enhancing fat oxidation, increasing muscle glycogen storage, or stimulating insulin release are not the main direct functions of BCAAs during exercise. While they may play roles in metabolism and performance, they do not capture the primary function of BCAAs as effectively as supporting glucose formation does.