The relaxation phase of a muscle contraction is often prolonged in a fatigued muscle,raising the likelihood of fused summation of action potentials causing painful disturbances to a skeletal muscle.What disturbance is being described?

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The disturbance being described is a cramp, which is a painful, involuntary contraction of a muscle that can occur when muscles are fatigued. The prolonged relaxation phase in a fatigued muscle increases the chance of fused summation of action potentials, leading to these involuntary contractions.

The Relaxation Phase of a Muscle Contraction Is Often Prolonged