Yt. Zhang et al., RELATIONSHIPS OF THE VIBROMYOGRAM TO THE SURFACE ELECTROMYOGRAM OF THE HUMAN RECTUS FEMORIS MUSCLE DURING VOLUNTARY ISOMETRIC CONTRACTION, Journal of rehabilitation research and development, 33(4), 1996, pp. 395-403
The relationship between vibromyographic (VMG) and electromyographic (
EMG) signals during isometric contraction of the human rectus femoris
muscles was studied. The method of least squares was used to obtain th
e best-fitting linear regression model to the root mean squared (RMS)
values of the VMG and the EMG. It is shown that for the rectus femoris
of four subjects, a linear VMG versus EMG relationship exists during
20-80% of the maximum voluntary contraction (MVC) at 30 degrees, 60 de
grees, and 90 degrees of knee joint flexion angles. The relation betwe
en the VMG and the EMG may be explained by the order recruitment of mo
tor units and by the ''onion-skin'' phenomenon of the firing rates of
recruited motor units in the regulation of muscle force production as
reported in electro-neurophysiologic studies.