Power Spectral Density Analysis of Decomposed EMG Signals for Dominant and Non-dominant Hands

Electromyography (EMG) computes the electrical activity of the muscles. While performing certain work, groups of muscles are incorporated. As the muscle force required to perform that particular work increases, the central nervous system triggering signal increases in terms of activation of more motor units under that particular muscle. This results in high EMG signal amplitudes. EMG signal varies even when the same work is performed by both hands i.e., dominating and non-dominating hands. This led us to evaluate EMG Power Spectral Density (PSD) while performing passive muscle movement and active muscle movement, carrying different weights. EMG was recorded at the biceps brachii and analyzed for 7–10 healthy subjects. Subjects were requested to perform the concentric contraction of both dominating and non-dominating hand muscles while lifting 0, 1, 2, 3, and 4 kgs of the weight. The result shows significant EMG PSD variations during the contraction of hand muscles. These findings could be applied to the patient's muscle movement to develop a verification of the presence of muscle activity in the patients for both hands.