When marathon runners “hit the wall” around mile 20, ____________________ is the most likely explanation for the sudden onset of fatigue.Group of answer choicesPCr Depletionglycogen depletionPi Accumulation
Question
When marathon runners “hit the wall” around mile 20, ____________________ is the most likely explanation for the sudden onset of fatigue.Group of answer choicesPCr Depletionglycogen depletionPi Accumulation
Solution
The most likely explanation for the sudden onset of fatigue when marathon runners "hit the wall" around mile 20 is glycogen depletion.
Here's why:
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Glycogen is the stored form of glucose, which is a runner's primary source of energy.
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During a marathon, the body uses this stored glycogen to produce energy.
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However, the body can only store a limited amount of glycogen.
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When these stores are depleted, which usually happens around mile 20 in a marathon, the body has to switch to a less efficient source of energy, fat.
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This switch causes the runner to feel a sudden onset of fatigue, often referred to as "hitting
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