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Single-Fiber and Macro Electromyography 

Single-Fiber and Macro Electromyography
Chapter:
Single-Fiber and Macro Electromyography
Author(s):

Jun Kimura

DOI:
10.1093/med/9780199738687.003.0016
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date: 27 July 2021

This chapter reviews single-fiber and macro electromyography. A small leading-off surface of the single-fiber needle electrode lies closer to fewer muscle fibers than the larger tip of the conventional needle that commands a wider territory. Thus, the single-fiber needle allows extracellular recording of individual muscle fiber action potentials during voluntary contraction or after nerve stimulation. Termed single-fiber electromyography, this technique has contributed substantially to the understanding of muscle physiology and pathophysiology. In the clinical domain, this recording supplements conventional electromyography by determining (1) fiber density, the number of single-fiber action potentials within the recording radius of the electrode, and (2) jitter, the variability of the interpotential interval between two or more single muscle fibers belonging to the same motor unit.

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