Discussion
Select that correct option : During strenuous exercise, the major reason for onset of fatigue is
Answer: C
During strenuous exercise the main reason for the onset of fatigue is the formation of lactic acid. As the muscles work harder than the oxygen supply can meet, glycogen is broken down without oxygen, lactic acid builds up, and the rise in acidity interferes with muscle contraction.
An oxygen debt is the extra oxygen taken in after exercise, so it is a result and not the cause of fatigue. Complete depletion of oxygen does not happen in the muscles in this way, and a rise in carbon dioxide stimulates breathing but is not the chief cause of fatigue.
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