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Updated: Feb 11, 2026

Isolation and Characterization of the Murine Uterosacral Ligaments and Pelvic Floor Organs
Published on: March 3, 2023
Electromyographic activity of the pelvic floor muscles in the third trimester: comparison between primigravidae and
Objective:
The objective was to compare the electromyographic activity of pelvic floor muscle (PFM) on third semester between primigravidae and secundigravidae who had previous vaginal delivery.
Design:
Cross-sectional observational study.
Sample:
Nineteen primigravidae and 21 secundigravidae between 34'h and 361 gestational weeks were evaluated.
Materials And Methods:
Data collection consisted in assessing the PFMs activity by surface electromyography.
Main Outcome Measures:
The variables related to electromyographic assessment such peak and average on the rest, maximal voluntary contraction, and sustained contraction.
Results:
There were no differences on electromyographic activity of PFMs between primigravidae and secondigravidae. However, a significant increase in body mass index and a negative correlation of the newborn weight with the peak value of electromyographic signal during maximal voluntary contraction were observed.
Conclusions:
The factors that can change the electromyographic activity pattern during pregnancy can be related to maternal body mass increased and newborn weight.
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