Postpolio Muscular Atrophy

12 patients who had poliomyelitis 18 to 50 years earlier, from which 18 previously affected muscles were evaluated.

Quantitative motor unit potential analysis, single-fiber electromyography, and macroelectromyography (macro-EMG)

Differentiation of weakening muscles from previously affected but stable muscles using electrophysiological parameters (macro-EMG amplitude, motor unit potential duration and amplitude, jitter, fiber density, and blocking)surrogate