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Validity of electromyograms and tension as a means of motor unit number estimation

✍ Scribed by Keisuke Arasaki; Mitsuyuki Tamaki; Yasuhiko Hosoya; Norio Kudo

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
292 KB
Volume
20
Category
Article
ISSN
0148-639X

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✦ Synopsis

The purpose of this study was to validate three different techniques for obtaining motor unit number estimates of the rat medial gastrocnemius muscle. These consisted of two electromyographic techniques using unprocessed and digitally averaged unitary muscle action potentials, and one mechanical technique. We also injected subunit B of cholera toxin into this muscle and counted the number of spinal motor neurons labeled by the toxin. Our results revealed that a motor unit number estimate obtained by using the unprocessed unitary muscle action potential was statistically different from the actual number of motor neurons. The other two motor unit number estimates, however, were not statistically different from the actual motor neuron number. These two methods thus seem more appropriate than the first electromyographic method for obtaining an accurate motor unit number estimate.

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