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Science 24 July 1981:
Vol. 213. no. 4506, pp. 466 - 467
DOI: 10.1126/science.7244644
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Articles

Science, Vol 213, Issue 4506, 466-467
Copyright © 1981 by American Association for the Advancement of Science

articles

Discharge patterns of hindlimb motoneurons during normal cat locomotion

JA Hoffer, MJ O'Donovan, CA Pratt, and GE Loeb

Long-term recording from single lumbar motoneurons of intact cats revealed activation patterns fundamentally different from those seen in decerebrate preparations. In intact cats, motoneuron bursts showed marked rate modulation without initial doublets. Each unit's frequencygram generally resembled the envelope of the gross electromyogram simultaneously recorded from the corresponding muscle. Average and peak discharge rates increased for faster gaits. These findings suggest that, in cat locomotion, rate modulation is a more important contributor to force regulation than was previously thought.


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