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EVOKED EMG of THE MASTICATORY MUSCLES by TRANSCRANIAL MAGNETIC STIMULATION IN MAN

经颅磁刺激人体咀嚼肌诱发肌电图

基本信息

批准号：
07457474
负责人：
FUJII Hiroyuki
金额：
$ 4.35万
依托单位：
NAGASAKI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

Using a transcranial magnetic stimulation, peripherally or centrally induced responses of the masseter muscle were electromyographically analized in man.By positioning the center of a stimulating coil at 9cm far inferolaterally from the vertex along a contour of the skull, four responses were induced from the ipsilateral masseter muscle. Other two responses were recorded from the contralatera masseter muscle by positioning the coil center at 3-5.5cm laterally and 2.5cm anteroirly from the vertex.latencies of the ipsilateral responses were 6msec, 10-13msec and 2-3msec in the order of threshold level. These responses were thought to be M-wave, a wave corresponding to S-wave in the extremity muscles, one drived from the cortex, and H-wave, respectively.Latencies of the contralateral responses were 11-13msec and 23msec. The former is the most likely to be I-wave (Amassian : 1987) drived from the cortex, or D-wave (Edyly : 1990).When the stimulus was applied during a gum-chewing without any expectations, a cycle time of the stroke was remarkably prolonged, and the rhythm of following 2-3 strokes became unstable. This is thought to e an effect of the disturbance on a rhythm generator due to cortical stimulation.By magnetic stimulation, an incomplete depression phase appeared on the masseter EMG with a latency of approximately 80msec. This long-latency depression might related to the cortex in the orign.

使用经颅磁刺激，通过肌电图分析人体咬肌的外周或中枢感应反应。通过将刺激线圈的中心定位在沿颅骨轮廓距顶点下外侧 9 厘米处，从同侧咬肌诱发四种反应。通过将线圈中心定位在距顶点横向3-5.5cm和前向2.5cm处，从对侧咬肌记录另外两个反应。同侧反应的潜伏期按照阈值水平的顺序为6毫秒、10-13毫秒和2-3毫秒。这些反应分别被认为是 M 波、一种与四肢肌肉中的 S 波相对应的波（由皮层驱动）和 H 波。对侧反应的延迟时间为 11-13 毫秒和 23 毫秒。前者最有可能是从皮质驱动的I波（Amassian：1987），或D波（Edyly：1990）。当在没有任何预期的咀嚼口香糖过程中施加刺激时，中风的周期时间显着延长，并且随后2-3次中风的节律变得不稳定。这被认为是由于皮质刺激对节律发生器的干扰的影响。通过磁刺激，咬肌肌电图上出现不完全的抑制阶段，潜伏期约为80毫秒。这种长潜伏期的抑郁可能与起源的皮质有关。