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Journal of the Korean Academy of Rehabilitation Medicine 2006;30(5):436-440.
The After-effect of Sub-threshold 10 Hz Repetitive Transcranial Magnetic Stimulation on Motor Cortical Excitability.
Ko, Myoung Hwan , Jeong, Young Chang , Seo, Jeong Hwan , Kim, Yun Hee
1Department of Physical Medicine and Rehabilitation, Chonbuk National University Medical School, Research Institute of Clinical Medicine, Korea.
2Department of Physical Medicine and Rehabilitation, Stroke and Cerebrovascular Center, Samsung Medical Center, Sungkyunkwan University School of Medicine, Korea. yumkim@smc.samsung.co.kr
10 Hz 역치하 반복 경두개자기자극 후 운동피질 흥분도의 지속적 변화
고명환, 정영창, 서정환, 김연희1
전북대학교 의과대학 재활의학교실 및 임상의학연구소, 1성균관대학교 의과대학 삼성서울병원 재활의학교실 및 뇌졸중센터
Abstract
Objective
To study the after effects of high-frequency repetitive transcranial magnetic stimulation (rTMS) over the primary motor cortex on cortical excitability
Method
Twenty healthy volunteers received 1,000 stimuli of 10 Hz rTMS. Repetitive TMS was given over the 'motor hot spot' of the right first dorsal interosseus muscle using an intensity of 80% of resting motor threshold. We evaluated the amplitude of motor evoked potential (MEP) using single pulse TMS and intracortical inhibition and intracortical facilitation with paired pulse TMS paradigm. After baseline measurement, the amplitude was measured immediately after stimulation and 10, 20, 30 and 40 minutes afterrTMS.
Results
The amplitude of MEP was significantly increased for 10 minutes after applying 1,000 stimuli of 10 Hz rTMS. Additionally, intracortical inhibition was significantly reduced and intracortical facilitation was significantly enhanced for 10 minutes after 10 Hz rTMS.
Conclusion
These results showed that 1,000 stimuli of 10 Hz rTMS over primary motor cortex increased the corticospinal excitability for 10 minutes. In addition, 10 Hz rTMS induced a suppression of the intracortical inhibitory circuitry and facilitation of the excitatory circuity for 10 minutes. (J Korean Acad Rehab Med 2006; 30: 436-440)
Key Words: Repetitive transcranial magnetic stimulation, Motor cortex, Cortical excitability


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