Trained muscles burn _____ fat and at higher intensities than untrained muscles, so they require _____ glucose to perform the same amount of work.
a. more; less
b. less; more
c. more; more
d. less; less
e. more; no
Question 2
Glycogen depletion generally occurs after about _____ of vigorous exercise.
a. two hours
b. one hour
c. three hours
d. 30 minutes
e. four hours