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Electromyography and Other Measures of Muscle Function 

Electromyography and Other Measures of Muscle Function
Chapter:
Electromyography and Other Measures of Muscle Function
Author(s):

Jun Kimura

DOI:
10.1093/med/9780199738687.003.0013
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date: 27 July 2021

This chapter discusses the principles of electromyography based on physiology, recording techniques,and contraindications. Studies are consistent withassessing insertional activities and spontaneous discharges, and analyzing motor unit action potentials characterized by amplitude, rise time, duration, and discharge pattern. Needle study evaluates the integrity of the entire motor system, which consists of upper and lower motoneurons, neuromuscular junction, and muscle. To localize the responsible lesion in one of these sites, the trained physician must conduct the study as an extension of the physical examination. The findings in the initially tested muscle dictate the course of subsequent exploration. Thus, no rigid protocol applies for a routine examination. Certain basic principles hold, but a flexible approach best fulfills the needs of individual patients.

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