Electromyogram

Electromyogram or EMG is associated with human muscle activity. The bioelectric potentials of human muscle activity is measured by a certain process where needle electrodes are used to penetrate the skin. The summation of all the potentials yields EMG. The amplitude of the measured EMG waveform can be interpretated as the instantaneous sum of all the potentials of muscle or muscle groups generated at any given time. Hence we can expect a random-noise waveform here. Here electrodes sense potentials from all the muscles within its range. Regardless the stimulus intensity, we know that all muscles possess an action potential with a fixed magnitude. The waveform sometimes also called as interference pattern.