title: Temporal facilitation prior to voluntary muscle relaxation.
abstract: We investigated the dominancy of excitability changes in motor cortex or spinal levels and temporal tuning mechanisms of muscle relaxation. We delivered transcranial magnetic stimulation and electric (H-reflex) stimulations relative to the application of the response signal under the reaction time task. The results showed that a significant change was found in only motor evoked potential during the prerelaxation phase, 30 ms after the response signal presented for muscle relaxation, but similar changes were not found in H-reflex. We suggested that this phenomenon, may be, reflects on excitation of corticospinal neurons, which consequently play an important role for muscle relaxation.
authors.affiliation: School of Rehabilitation, Faculty of Health and Social Work, Kanagawa University of Human Services, Yokosuka, Kanagawa, Japan. sugawara-k@kuhs.ac.jp
authors.forename: Kenichi
authors.initials: K
authors.lastname: Sugawara
authors.forename: Shigeo
authors.initials: S
authors.lastname: Tanabe
authors.forename: Toshio
authors.initials: T
authors.lastname: Higashi
authors.forename: Takamasa
authors.initials: T
authors.lastname: Tsurumi
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Kasai
mesh_terms: D000328:Adult; D019054:Evoked Potentials, Motor / Q000502:physiology*; D005260:Female; D006181:H-Reflex / Q000502:physiology; D006801:Humans; D008297:Male; D009044:Motor Cortex / Q000502:physiology*; D009046:Motor Neurons / Q000502:physiology; D009068:Movement / Q000502:physiology; D009119:Muscle Contraction / Q000502:physiology; D009126:Muscle Relaxation / Q000502:physiology*; D009129:Muscle Tonus / Q000502:physiology*; D018482:Muscle, Skeletal / Q000294:innervation / Q000502:physiology*; D009431:Neural Conduction / Q000502:physiology; D009483:Neuropsychological Tests; D011712:Pyramidal Tracts / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology; D013997:Time Factors; D050781:Transcranial Magnetic Stimulation; D055815:Young Adult