title: Relationship between cerebral activity and movement frequency of maximal finger tapping.
abstract: 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. Change of the integrated electromyogram (iEMG) for the frequency and change of rCBF for the frequency at all the tested frequencies showed similar tendencies.
authors.affiliation: Graduate School of Human Environment Studies, Kyushu University, Fukuoka, Japan. kuboyama-n@students.ihs.kyushu-u.ac.jp
authors.forename: Naomi
authors.initials: N
authors.lastname: Kuboyama
authors.forename: Teru
authors.initials: T
authors.lastname: Nabetani
authors.forename: Kenichi
authors.initials: K
authors.lastname: Shibuya
authors.forename: Keishi
authors.initials: K
authors.lastname: Machida
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Ogaki
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D004576:Electromyography; D005260:Female; D005385:Fingers / Q000502:physiology*; D006801:Humans; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D009044:Motor Cortex / Q000098:blood supply*; D012039:Regional Blood Flow / Q000502:physiology; D019265:Spectroscopy, Near-Infrared