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Amplitude of the F wave

A potential means of documenting spasticity

Department of Neurology and Neurosurgery, McGill University, Montreal, Canada.

The amplitude of 32 averaged F responses (F32) recorded with surface electrodes was 1 percent of the amplitude of the M wave. The largest F response (F_max) was 4.5 percent of the M wave. In spasticity, F_max did not increase in amplitude but became more persistent, resulting in a significant increase of F32. There was a positive correlation between the amplitude of F32 and the M wave, and this relationship was abnormal in 60 percent of the studies of patients with spasticity.

Dr. Eisen's address is Montreal Neurological Institute and Hospital, 3801 University Street, Montreal H3A 2B4, P.Q., Canada.

This study was supported by grants from the Muscular Dystrophy Association of Canada and the Multiple Sclerosis Society of Canada.

Accepted for publication February 20, 1979.