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The silent period and a rhythmic slower wave in EMG appear preceding a rapid voluntary movement (Tanii 1984). The present study was performed to investigate temporal relationships of the EMG changes preceding movement to premovement cortical potential shifts, in order to clarify whether the EMG changes are related to preparation and initiation of voluntary(More)
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(More)
The present study was performed to substantiate the premise that frequency components of the surface EMG before a reaction movement change after a warning signal (S1). Twelve subjects extended rapidly the trunk from a bent position in response to a moving signal (S2) 2 sec after S1. The movement was repeated 20 times. Bipolar surface EMG recordings were(More)
  • K Tanii
  • 1984
The aim of the present study was to investigate whether an EMG slower wave prior to a rapid straightening-up movement is associated with motor preparation to perform the movement. The straightening movement was performed at 6 load intensities and under 3 conditions: without any external load; with an additional load; lifting a load. The subject could freely(More)
It has been reported that stretch reflex responses, including the long latency component, are modulated by motor preparation for the direction and type of movement. In the present study, human subjects were required to make a reaction movement in the direction of the wrist extension following a muscle stretch to the wrist flexor, and we investigated the(More)
The effect of long-latency reflex modulation on the performance of a quick adjustment movement following a muscle stretch was studied in 26 healthy male subjects. When the subjects felt a sudden angle displacement in the direction of a wrist extension they were required to make an adjustment movement by moving a handlebar, held in the hand, to align with a(More)
  • K Tanii
  • 1996
The present study was performed to investigate whether modes of voluntary contraction have an influence on an appearance of the premovement silent period (PSP) and components of the premovement cortical potentials. The EMG and the EEG were simultaneously recorded in an isometric ballistic contraction for exerting rapidly an elbow extension force and in a(More)
Two experiments were performed in order to study whether it is possible to record potentials related to the voluntary movement from electrodes placed on the skin overlying the spinous process of the 2nd and 6th cervical vertebrae and at Erb's point ipsilateral to the movement. In the first series of experiments (Experiment I) the subject initiated(More)