Abstract
In order to investigate the variations in the EMG power spectra, the power spectra of the bipolar surface EMG of the biceps brachii were obtained for the frequency range from 6 to 192 Hz by the autocorrelation and its Fourier transformation technique. The EMG power spectra of the biceps brachii showed relatively definite pattern with some intra- and inter-individual variations. The difference in the EMG power spectra between the right and left biceps brachii was not larger than the inter-individual variation. No systematic variation was observed in the EMG power spectra either with the contraction level or with the muscle length. It was concluded that the power spectra of the bipolar surface EMG of a muscle show relatively definite pattern irrespective of subjects, right- or left-side, contraction level and muscle length at least for normal biceps brachii if constant electrode condition is maintained.
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