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The Effect Of Sub-maximal Surface Electrical Stimulation On Stretch Reflexes In Neurologically Intact And Spinal Cord Injured Subjects

The effect of sub-maximal surface electrical stimulation on stretch reflexes was studied by simultaneously stimulating the soleus muscle and applying a 200 dorsiflexion perturbation to the ankle in both spinal cord injured (SCI) (n=2) and neurologically intact (NI) (n=2) individuals. The stimulator was turned off for 100 ms after the onset of the perturbation so that the M-wave would not obscure the evoked reflex response. The evoked soleus surface EMGs were recorded, rectified and averaged across seven trials. Responses during stimulated and relaxed conditions were compared. Perturbations were applied by a computer controlled footplate which was operating in a position controlled mode to insure that the perturbations would not be significantly different between the relaxed and stimulated conditions. The evoked response consisted of a short latency (40 - 70 ms after onset of perturbation) and long latency (70 - 100) burst. The short latency response was unchanged for two (one SCI and one NI) of the subjects and eliminated in the other two with stimulation. The long latency response was markedly increased in one NI subject and unchanged in the others with stimulation. The one SCI subject who showed no change in evoked EMGs was also unable to generate significant torque with stimulation.