BCAAs have a number of performance benefits. They are key to the growth, recovery and repair of muscle tissue, as well as the prevention of muscle tissue breakdown. This is of particular importance during and around intense training, as muscle cells can begin to breakdown.
As branched chain amino acids are metabolised directly in the muscles, the body can also use them as an energy source when required and this can delay the onset of muscular fatigue. Branched chain aminos and in particularly isoleucine have been linked to the replenishment of glycogen stores, meaning that they can have a direct impact on the bodies energy levels, allowing for prolonged physical exertion.