Question

Which one of the following statements concerning metabolic mechanisms of muscle fatigue is incorrect?

a. Inorganic phosphate, resulting from net creatine phosphate hydrolysis, accumulates to high levels during high intensity exercise.

b. Lactic acid accumulation, resulting from aerobic glycolysis, severely limits lower-intensity exercise.

c. Glycogen depletion is not a limiting factor in the duration of lower-intensity exercise.

d. Depletion of the adipose tissue lipid supply is the most significant limitation to high-intensity exercise.

e. Fast-twitch fiber types are better able to derive ATP from glycogen use while slow-twitch fibers are better able to derive ATP from fatty acid use.