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Reciprocal inhibition in cerebral palsy

Playfair Neuroscience Unit, Toronto Western Hospital, University of Toronto, and the Hugh MacMillan Rehabilitation Center, Toronto, Canada.

We studied reciprocal inhibition by recording the changes in firing probability of single motor units of the tibialis anterior muscle following stimulation of low-threshold afferents in the posterior tibial nerve. In 15 patients with cerebral palsy, the inhibition was as great or greater than normal. We found no evidence that group I afferents produce "reciprocal facilitation" in cerebral palsy.

Address correspondence and reprint requests to Dr. Peter Ashby, Playfair Neuroscience Unit, Toronto Western Hospital, 399 Bathurst Street, Toronto, ON, Canada M5T 2S8

Received July 6, 1989. Accepted for publication in final form September 22, 1989.

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