Main outcome measures
The pelvic floor sEMG were compared between CD and VD,and the four vaginal delivery subgroups. A modified Glazer protocol was used to analyze the pelvic floor sEMG value.
Results
The results showed that the average peak amplitude of phasic (flick) contractions and the average mean amplitude of tonic contractions were both significantly higher in CD than in VD (P < 0.01). In contrast, CD had less the mean amplitude variability of tonic contractions than VD (P < 0.01). The average peak amplitude of phasic (flick) contractions and the average mean amplitude of tonic contractions in forceps delivery group was statistically lower than the other vaginal delivery groups (P<0.05). The mean amplitude variability of tonic contractions was larger in forceps delivery group than group A, B. (P <0.01).