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The power spectra of the bipolar surface EMG during isometric contractions for various human skeletal muscles were obtained for the frequency range from 6 to 378 Hz by the autocorrelation and its Fourier transformation technique. The effect of small movement artifact appeared in the frequencies below 10 Hz and the effect of the ECG around 15 Hz. Although there were some variations in the EMG power spectra of a muscle among subjects, there existed different EMG power spectrum patterns for different muscles. The significant energy of the EMG was within a frequency range approximately from 10 to 200 Hz in the biceps brachii, triceps brachii, brachioradialis, pectoralis major, vastus medialis and lateralis, tibialis anterior, deltoid and rectus femoris with some variations among these muscles. On the other hand, the power spectra of the gastrocnemius, masseter and f rontalis were broadened and they had also significant energy above 200 Hz.

Power Spectral Analysis of Surface Electromyograms during Isometric Contractions