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Short-term fatigue is typically exercise-related; disease, immobility, or aging can lead to chronic muscle fatigue ,possible explanation for this could be that continuous gripping exerts a constant load on the muscles, leading to a quicker buildup of fatigue.It's also worth considering that the initial higher fatigue rate in continuous gripping might decrease as the muscles adapt to the sustained activity, while in repetitive gripping, the muscles might not fully recover during the short breaks, leading to a cumulative fatigue effect over time.

Short-term fatigue is typically exercise-related; disease, immobility, or aging can lead to chronic muscle fatigue ,possible explanation for this could be that continuous gripping exerts a constant load on the muscles, leading to a quicker buildup of fatigue. In contrast, repetitive gripping allows for brief recovery periods between grips, which may help in slowing down the fatigue process.
It's also worth considering that the initial higher fatigue rate in
continuous gripping might decrease as the muscles adapt to the
sustained activity, while in repetitive gripping, the muscles might not
fully recover during the short breaks, leading to a cumulative fatigue
effect over time.
Acute muscle soreness is due to lactic acid buildup. DOMS, on the other hand, is not related to lactic acid buildup; it's due to microscopic tears and muscle damage
Accordingly, muscle fatigue is not the point of task failure or the moment when the muscles become exhausted. Rather, muscle fatigue is a decrease in the maximal force or power that the involved muscles can produce, and it develops gradually soon after the onset of the sustained physical activity