Changes in activity of motor units preceding a rapid voluntary movement.
Motor unit activity was studied during slightly sustained contraction of the erector spinal muscle before a rapid trunk extension from a moderately bent position, with special reference to a change of the surface EMG to a rhythmic slower wave with a periodicity of 20-30 msec preceding the movement. Synchronous discharge of a few motor units appeared at regular intervals of 20-30 msec during the slower wave. EMG peaks in the slower wave corresponded to synchronous discharges at the regular intervals.
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Tanii
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Kinugasa
D004576:Electromyography; D006801:Humans; D008297:Male; D009046:Motor Neurons / Q000502:physiology*; D009068:Movement; D010507:Periodicity; D014836:Volition