HMS, BM 2014 HSC 16 MC

Which of the following will occur when an endurance athlete competes in an event lasting two and a half hours?

The metabolism of fat will decrease.
Fat will be the only fuel source metabolised.
The metabolism of protein will remain constant during the event.
The metabolism of glycogen will decrease towards the end of the event.

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\(D\)

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D is correct: Glycogen stores deplete during prolonged exercise reducing glycogen metabolism.

Other Options:

A is incorrect: Fat metabolism increases as glycogen stores become depleted.
B is incorrect: Multiple fuel sources are used not fat exclusively.
C is incorrect: Protein metabolism increases towards end of prolonged exercise.