The multichannel surface electromyography (EMG) is used to measure action potentials from the skin surface as propagation waves. We believe that anyone can make measurements and expand its use in the clinical field by making it possible to estimate the direction of myofibers when measuring with this EMG. Therefore, we investigated the relationship between the direction of the muscle fibers and the angle of the electrodes using a multichannel method that can quantitatively extract the propagating wave. From the analysis, we believe that we can estimate the direction of the muscle fibers from the propagation wave number.
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