Abstract
Age-related biological changes in neurons and skeletal muscle commonly affect neuromuscular function and strongly influence the expression of neuromuscular disease. Of primary importance is the attrition of entire motor units, with resultant neurogenic atrophy of skeletal muscle. Other age-related processes are sensory neuron loss, distal axonal degeneration, axonal atrophy, accumulation of multiple mitochondrial DNA mutations in muscle, and physical inactivity and deconditioning. The decline for most of these begins in early life and proceeds steadily; the curious lack of an abrupt falloff with age is not yet accounted for by any theory of pathogenesis.
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