Question

During relatively high intensity exercise lasting less than one hour, the primary fuel for muscular work is

a. amino acids.
b. blood glucose.
c. muscle glycogen.
d. plasma FFA.

Answer 1

During high intensity exercise lasting less than one hour, the primary fuel for muscular work is muscle glycogen.

Step-by-step explanation:

During relatively high intensity exercise lasting less than one hour, the primary fuel for muscular work is muscle glycogen. Initially, muscle glycogen is broken down to produce glucose, which is then used for energy production through glycolysis and aerobic pathways. As the intensity of exercise continues and glycogen levels in the muscle start to fall, glucose is released into the bloodstream by the liver, and fat metabolism is increased to fuel the aerobic pathways.