Question: Explain why is glycogen the preferred source of fuel during high-intensity exercise? If glycogen is so important for moderate- to high-intensity exercise, why are its stores limited compared to fat?
Question: A 70 kg male with 7% body fat has approximately 44,100 kcals stored as fat. Despite all of this stored energy, he still has difficulty completing a marathon under high-intensity, steady-state aerobic metabolism and is forced to slow down. Why?