title: Multiple EMG activity and intracortical inhibition and facilitation during a fine finger movement under pressure.
abstract: The 1st purpose of this study was to examine multiple electromyography (EMG) during voluntary hand movements. A secondary purpose was to investigate possible effects of pressure on intracortical inhibition (ICI) and intracortical facilitation (ICF) functions of the motor cortex, using paired-pulse transcranial magnetic stimulation. Twelve participants traced a 15-cm diameter target circle using a small laser pointer attached to the right index finger. After 5 acquisition trials, they performed 3 nonpressure trials followed by 3 pressure trials. The results showed that pressure had effects not only on agonist EMG activity but also on multiple muscles, such as synergist. In addition, a decrease in ICI and an increase in ICF were both observed under pressure for muscles other than the agonist.
authors.affiliation: Faculty of Economics, Tezukayama University, Nara, Japan.
authors.forename: Yoshifumi
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Kozo
authors.initials: K
authors.lastname: Funase
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Sekiya
authors.forename: Joyo
authors.initials: J
authors.lastname: Sasaki
authors.forename: Toru
authors.initials: T
authors.lastname: Takemoto
mesh_terms: D004576:Electromyography / Q000379:methods*; D005260:Female; D005385:Fingers / Q000502:physiology*; D006801:Humans; D008297:Male; D009044:Motor Cortex / Q000502:physiology*; D009068:Movement / Q000502:physiology*; D009433:Neural Inhibition / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology; D013315:Stress, Psychological / Q000503:physiopathology*; D050781:Transcranial Magnetic Stimulation / Q000379:methods; D055815:Young Adult