Relationship between Cerebral Activity and Movement Frequency of Maximal Finger Tapping

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  • Kuboyama Naomi
    Graduate School of Human Environment Studies, Kyushu University
  • Nabetani Teru
    Department of Contemporary Communication, Shizuoka Eiwa Gakuin University Junior College
  • Shibuya Kenichi
    Department of Sports Science, Japan Institute of Sports Science
  • Machida Keishi
    Hitachi Medical Co. Ltd.
  • Ogaki Tetsuro
    Graduate School of Human Environment Studies, Kyushu University Institute of Health Science, Kyushu University

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To examine the cerebral activity of the motor cortex during maximum movement, we measured regional cerebral blood flow (rCBF) in twelve normal volunteers, using near infrared spectroscopy (NIRS). Repetitive tapping of the right index finger was performed at 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, and 4.5 Hz, and during maximum effort (ME). The relative increase rate of rCBF during movement beginning with a resting condition was calculated for each movement condition. The left primary sensorimotor cortex showed significant activation during ME compared to the other frequencies. The rapid increase of rCBF was seen immediately after the initiation of finger tapping at all the tested frequencies but showed no increase following that. However, the rCBF during ME continued to increase until the end of the task.<br>Change of the integrated electromyogram (iEMG) for the frequency and change of rCBF for the frequency at all the tested frequencies showed similar tendencies.

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