Question

In short-term performances (10-180 seconds) which of the following factors is the primary cause of muscle fatigue?

a. muscle glycogen depletion
b. H+ accumulation
c. hypoglycemia
d. depressed plasma FFA

Answer 1

In activities lasting 10-180 seconds, muscle fatigue is primarily caused by H+ accumulation from lactic acid buildup, which affects enzymatic and protein function necessary for muscle contraction.

Step-by-step explanation:

In short-term performances ranging from 10 to 180 seconds, the primary cause of muscle fatigue is likely due to H+ accumulation, which is a result of lactic acid buildup. This buildup lowers intracellular pH, negatively affecting enzyme function and protein activity crucial for muscle contractions. The depletion of ATP reserves happens during brief, intense activities and is also a contributing factor, as ATP is essential for muscle contractions. However, in this context, H+ accumulation is a more immediate concern that can inhibit muscle function.