[Peculiarities of multisegmental monosynaptic responses of leg muscles in subjects with lumbar nerve compression]

There were tested reflex motor responses of 16 simmetrical leg muscles, evoked by electric stimulation of lumbar nerve at level of L2-L3- or L3-L4-spinal proceses, in group of healthy subjects and that of patients with the sings of lumbar-nerve compression. The responses were studied when the subjects were in condition of rest. The evoked responses agreed with Ia afferents activation through monosynaptic neuronal cicuits. Their monosynaptic nature was demonstrated by amplitude changes to conditioning stimulus and to continuing tendon vibration applied. It was established that on the background of the studied disorder multisegmental monosynaptic responses of leg large distal flexors with a great amount of slow motor units suffered most significant modifications.