Prevention of fatigue with the help of BCAAs in athletes can occur in two primary ways. First, the loss of ATP or cellular energy occurs with the loss of stored glucose in the form of glycogen. ATP levels are maintained by the BCAAs degradation and fatty acid utilization after glycogen depletion. The effect of BCAAs as energy is approximately 3-18% and possibly more, depending on the duration or the intensity of the workout. Muscle tissue can oxidize Leucine for energy or convert Leucine into Glutamine or Alanine for blood energy. Glutamine or Alanine can be converted into Glucose. Also IsoLeucine and Valine can be converted to form Krebs cycle components for energy as well; making all three BCAAs a valuable source of muscle energy.