Abstract
The response of muscle to an impulse of stimulus is called a twitch. For a linear system, the convolution of an input to the system with the system's impulse response yields the output of the system. Experiments were performed to obtain the surface e.m.g. from human triceps muscle during isometric contractions. This e.m.g. was filtered and rectified, and convolved with the impulse response of an overdamped 2nd-order system. The resulting signal was fitted to the measured force by linear regression, and a good fit was found. The information content of surface e.m.g. when used as a force predictor is confined to a small range of frequencies: d.c.-30Hz.
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