HMS, BM 2015 HSC 10 MC

What is the cause of fatigue for the alactacid (ATP-PCr) system?

Lack of essential amino acids
Lack of muscle glycogen stores
Inability to re-synthesise phosphate creatine
Inability to convert carbohydrates to glycogen

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\(C\)

Show Worked Solution

C is correct: ATP-PCr system fatigues when PCr stores are depleted.

Note: The 2015 exam used “alactacid system” terminology from the 2012 PDHPE syllabus. In HMS, this is called the “ATP-PCr system.”

Other Options:

A is incorrect: Amino acids not used in ATP-PCr system.
B is incorrect: Glycogen relates to glycolytic system not ATP-PCr.
D is incorrect: Carbohydrate conversion unrelated to ATP-PCr fatigue.