| Changes in Ipsilateral Motor Cortex Excitability during Hand Exercise in Normal Subjects. |
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Yoo, Woo Kyoung , Jun, Ah Young , Jung, Kwang Ik , Park, Dong Sik , Ju, Young Su |
1Department of Rehabilitation Medicine, Hallym University, College of Medicine, Korea. mediay75@nate.com
2Department of Industrial Medicine, Hallym University, College of Medicine, Korea. |
| 정상 성인에서 수부 운동 시 동측 운동영역의 흥분도 변화 |
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유우경, 전아영, 정광익, 박동식, 주영수1 |
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한림대학교 의과대학 재활의학교실, 1산업의학교실 |
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| Abstract |
Objective
To observe the effect of complexity of unilateral hand activity or dominance of hand on ipsilateral motor cortex excitability.
Method
Twenty healthy volunteers of right handedness were recruited. We applied the transcranial magnetic stimulation on right hemisphere, and measured motor evoked potential (MEP) at left first dorsal interossei (FDI). We observed the changes of MEP amplitude during the execution of three different complexities of right finger movement. We set the motor tasks as (1) relaxed state, (2) repetitive opposition of 3rd finger (simple exercise) and (3) opposition of 3rd, 5th, 2nd, 4th finger (complex exercise). These tasks were performed within one minute, and repeated 3 times. To observe the effect of hand dominance, we also measured MEP at right FDI during left hand movements.
Results
Ipsilateral motor cortex was significantly facilitated by ipsilateral voluntary hand activity (p＜0.01). And the MEP amplitude was also increased by complexity of hand exercise.
Conclusion
We found that the excitability of ipsilateral motor cortex was changed by unilateral hand exercise, and the excitability was increased by complexity of hand exercise. (J Korean Acad Rehab Med 2004; 28: 146-150) |
| Key Words:
Ipsilateral facilitation, Hand dominance, Transcranial magnetic stimulation |
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