1996 Fiscal Year Final Research Report Summary
EVOKED EMG of THE MASTICATORY MUSCLES by TRANSCRANIAL MAGNETIC STIMULATION IN MAN
| Project/Area Number |
07457474
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
補綴理工系歯学
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| Research Institution | NAGASAKI UNIVERSITY |
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Principal Investigator |
FUJII Hiroyuki NAGASAKI UNIVERSITY,SCHOOL of DENTISTRY,PROFESSOR, 歯学部, 教授 (20067060)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIMATSU Tadashi NAGASAKI UNIVERSITY,SCHOOL of DENTISTRY,ASSISTANT PROFESSOR, 歯学部附属病院, 助手 (50230800)
HASHIMOTO Nobuyuki NAGASAKI UNIVERSITY,SCHOOL of DENTISTRY,ASSISTANT PROFESSOR, 歯学部, 助手 (50198686)
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| Project Period (FY) |
1995 – 1996
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| Keywords | MAGNETIC STIMULATION / CORTEX / EVOKED EMG / MASTICATORY MUSCLE / MASSETER / DEPRESSION PHASE / MAN |
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| Research Abstract |
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.
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Research Products
(6 results)
