Effects of a One-Time Biofeedback EMG Session on Neuromuscular Activity of the Pelvic Floor Muscles in Pregnant Women

In 92 healthy nulliparous women with uncomplicated pregnancies, the function of the pelvic floor muscles (PFMs) was assessed by surface electromyography (EMG) with the use of vaginal probes. The impact of a single biofeedback session on EMG parameters was examined. As was found, such sessions provided significant increases in the EMG amplitude in 60- and 10-sec-long contractions ( P = 0.01 and P = 0.00, respectively). With respect to quick flicks of the PFMs, a tendency for increase was also observed, but the difference did not reach the significance level. There was no effect of biofeedback sessions on the EMG level in relaxation.