脛骨神経電気刺戟の重心動揺に及ぼす影響について

Various diseases are being discovered from the abnormal movements caused by the disturbances of the extrapyramidal tract.<br>The Parkinson disease which is the representative disease of equilibrium dysfunctions is noted with a specific posture reflex disturbance. In gait disturbance, especially, the patient has frozen gait and phenomenon is considered to be due to the rigidity of the muscles caused by tremors.<br>Recentiy, by using the gravicorder, we had examined and analysed the body sway in the static phase. When observing the patient who had Parkinson disease by means of the gravigram, tremors of 6-7Hz were being recorded on the power spectrum. These tremors which originally appeared on the upper limbs could also be recorded on the standing gravigram indicating that the lower limbs could be influenced by the tremors.<br>In this research, we experimented with gravigram through quantitative change of muscular stimulations by introducing the galvanic stimuiation that cause frozen gait in Parkinsonism to normal subjects. The experiment was motivated by the fact that the pheemonena of tremors in Parkinson disease were often being temporarily improved with acupuncture, and, we were trying to find out on what frequency of stimulation, the voluntary movements of the muscles in normal subjects could be blocked through muscular stimulations.<br>As a basic experiment, the muscular stimulation was given at "Shozan" (the inferior surface of the tendon muscle in the leg, International No. BL57) in the normal subjects and recorded the tonic contraction responding to the poulse of galvanic stimulation on the gravigram.<br>In the patients with Parkinson disease more tonic contractions were being observed in the lower limbs. In normal subjects, stimulations to N. Tibialis on the (posterior lateral) lateroposterior surface of the knee with plate electrode produced simultaneous galvanic stimulations to the muscles of both lower limbs.<br>The pulse stimulations of 5 mA were being used in this experiment such as 1Hz, 3Hz, 5 Hz, 7Hz and 10Hz, and they were being administered to 5 normal male subjects at 30° fan-shaped foot position. It was found that under the stimulation of 1Hz-5Hz, the equilibrim righting function of voluntary movement did not disappear, however, its function could be blocked with 5Hz-7Hz. By 10Hz stimulation, the voluntary movement was blocked by complete muscular contraction and the body position assumed the defence posture.<br>The frozen gait phenomenon in Parkinson disease is considered to be the result of the blocking of the voluntary movement and in fact, patient, with Parkinsonism have poor motor coordination of swinging movements from left to right and from front to back.<br>As regarding the effect of acupuncture, we have analysed the data of cases with Parkinson disease and found out that the tremors appeared through the dysfunction of extrapyramidal tract caused by the disturbances of the pallidum and strictum.<br>Acupuncture produces muscular contractions by peripheral pulse stimulation and the extrapyramidal tract which is related to other movement reflexes transmits a strong feed back against this stimulation resulting in the disappearance of the tremors.