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Journal of Applied Physiology, Vol 68, Issue 3 1177-1185, Copyright © 1990 by American Physiological Society
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M. Solomonow, C. Baten, J. Smit, R. Baratta, H. Hermens, R. D'Ambrosia and H. Shoji
Department of Orthopaedic Surgery, Louisiana State University Medical Center, New Orleans 70112.
The isolated contributions of motor unit recruitment and firing rate variations to the median frequency of the electromyogram's power density spectrum were determined. Orderly stimulation of the cat gastrocnemius motor units via nerve electrodes gave rise to linearly increasing median frequency regardless of the action potential firing rate of the active motor units. Increase in the discharge rate of all the motor units resulted in nearly constant median frequency. It was concluded that the increasing average conduction velocity during motor unit recruitment is the major contributor to variations in the electromyogram median frequency. The possibility of using the median frequency as the index to identify the recruitment control strategies employed by various muscles during increasing force contraction is suggested.
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V. von Tscharner and B. M. Nigg Point:Counterpoint: Spectral properties of the surface EMG can characterize/do not provide information about motor unit recruitment strategies and muscle fiber type J Appl Physiol, November 1, 2008; 105(5): 1671 - 1673. [Full Text] [PDF]
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