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Mechanomyogram (MMG) is regarded as the recording of mechanical oscillation generated on the surface of muscle concomitant with muscle contraction. Recently, applicable studies have progressed in the fields of physiology, clinical medicine, and rehabilitation (Akataki, et al., 1996, 2002; Barry, et al., 1986; Orizio, et al., 1999; Yoshitake, et al., 2001). From the results of in vitro studies (Barry, 1987; Frangioni, et al., 1987), MMG is assumed to originate in a pressure wave, generated from lateral dimensional expansion when the muscle fiber contracts. No study, however, has been examined the generation mechanism of MMG from architectural change of the muscle. In studies on human muscles, characteristics of MMG are compared with the contractile properties of activated muscle fibers by microstimulation (Yoshitake, et al., 2002). In a single twitch contraction for instance, MMG has recognized a waveform in muscle fiber contraction/relaxation phases. In repetitive contraction, the fluctuations of tension wil l be smaller as the st imulation frequency increases and fusion is developed. In this state, architectural change in muscle by muscle fiber contraction/relaxation is lesser, resulting in a smooth wave in muscle tension. Therefore, the pressure wave from contracting muscle naturally becomes smaller with smaller muscle architectural change. Indeed, MMG amplitude and fluctuation of muscle tension decreased simultaneously with an increase of stimulus frequency (Yoshitake, et al., 2002). This supports the hypothesis that the origin of MMG is the pressure wave generated by architectural change (Barry, 1987; Frangioni, et al., 1987). Especially, since the lateral dimensional expansion of the muscle fiber is generated by the change of muscle fiber contraction and relaxation, there should be a close relation between the changes of muscle length and MMG amplitude. Ultrasonography is a measuring tool that allows real-time measurement of the change of fascicle length accompanying muscle contraction in humans Surface Mechanomyogram Reflects Length Changes in Fascicles of Human Skeletal muscles