Moccellin A S, Rett M T, Driusso P
Clin Exp Obstet Gynecol. 2016;43(4):565-568.
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.
Cross-sectional observational study.
Nineteen primigravidae and 21 secundigravidae between 34'h and 361 gestational weeks were evaluated.
Data collection consisted in assessing the PFMs activity by surface electromyography.
The variables related to electromyographic assessment such peak and average on the rest, maximal voluntary contraction, and sustained contraction.
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.
The factors that can change the electromyographic activity pattern during pregnancy can be related to maternal body mass increased and newborn weight.
比较初产妇和经产妇（既往有阴道分娩史）在妊娠晚期盆底肌肉（PFM）的肌电活动。
横断面观察性研究。
评估了19例初产妇和21例经产妇，孕周在34至36周之间。
通过表面肌电图评估盆底肌肉活动来收集数据。
与肌电图评估相关的变量，如静息时的峰值和平均值、最大自主收缩以及持续收缩。
初产妇和经产妇的盆底肌肉肌电活动无差异。然而，观察到体重指数显著增加，且新生儿体重与最大自主收缩时肌电信号峰值呈负相关。
孕期可改变肌电活动模式的因素可能与孕妇体重增加和新生儿体重有关。
