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Combined Session With American Association of Electromyography and Electrodiagnosis

The functioning of the segmentary spinal circuits, as explored by clinical neurophysiology, is controlled by supraspinal structures. This study examines how vestibular stimulations modify, in the healthy man and in spastic patients, the excitability of three myotatic arcs of the leg. Vestibular stimulations were obtained by application of electric shocks (3.5 ma during 300 msec) to the mastoid and by injection of water into the ear canal (200 cc of H1O at 44" C). The myotatic reflex of the soleus, quadriceps, and short biceps femoris were activated by percussion of the tendon with an electromechanical hammer. Twelve electromyographic responses were averaged. The H reflex was evoked with the usual precautions. No movement was noticed after vestibular stimulation in seated patients. The results indicate: 1. Facilitation of the tendon reflexes of the extensor muscles but not of the flexor muscle (short biceps) occurs. 2. Facilitation of the tendon reflex of the soleus is significantly greater than that of the H reflex. 3. Effects of caloric and electrical stimulation are qualitatively similar, except for their different time courses. 4. Facilitation of extensor reflexes is reduced in patients with a pyramidal syndrome.