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Spectral analysis of the myo electric activity of the pelvic floor during voluntary contractions



Spectral analysis of the myo electric activity of the pelvic floor during voluntary contractions



Electromyography and Clinical Neurophysiology 16(6): 525-551



The effect of deliberate contractions of the muscles of the voluntary sphincter complex [in man] on the power spectrum of its EMG [electromyography] was investigated. There was a significant increase in the average frequency of the resting activity after a sustained voluntary contraction compared with that before the contraction. The spectrum returned to its normal profile within about 1 min. Tests at different levels of contraction showed that above a threshold near to the maximum, contractions were accompanied by a large increase in low to mid band energy whereas low and moderate contractions were not accompanied by marked changes in the spectrum. The energy became more concentrated in the low and mid band regions as contractions at a set level were sustained towards fatigue. Similar pressures were accompanied by different levels of electrical activity indicating a variation in muscle efficiency. In 4 cases of 6 the efficiency increased during a series of brief contractions. An increasing efficiency was accompanied by a decrease in the power at low frequencies and an increase in that at the lower mid-band frequencies. The converse of this was also demonstrated. Fatigue was accompanied by some decrease of energy at the high frequency end of the spectrum.

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