How is fatigability useful in diagnosing neuromuscular disease

What is meant by fatigability? How is fatigability useful in diagnosing neuromuscular disease?

Fatigability is defined as progressive weakness of muscle with repetitive use, followed by recovery of strength after a brief period of rest. It is a classic finding in myasthenia gravis often involving eye movements, eyelids (ptosis), and proximal upper extremity muscle groups. Lambert–Eaton myasthenic syndrome is often the reverse of myasthenia gravis, where there is a paradoxical increase in the muscle strength observed with repetitive muscle contraction.

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