[Detection and analysis of recurrent inhibition of spiking human motor neurons].

Effect of electrical stimulation of n. tibialis efferents on m. soleus motor units was studied during weak voluntary muscle contraction. Peristimulus histograms of low-threshold units (which were not stimulated) revealed a strong inhibitory effect with latency 35-40 ms and duration 10-20 ms. The results showed that this inhibitory effect represents recurrent inhibition whose peculiarities were analyzed. The dependence between the efficiency of the inhibitory volley and the moment within an interspike interval at which the volley arrived was found. Lengthening of the interval was observed only when the inhibitory drive occurred close to the end of the interval.