Department of Physiotherapy, Faculty of Health Sciences, University CEU-Cardenal Herrera, Valencia, Spain.
Department of Medicine, Faculty of Health Sciences, University CEU-Cardenal Herrera, Valencia, Spain.
PLoS One. 2018 Mar 27;13(3):e0194853. doi: 10.1371/journal.pone.0194853. eCollection 2018.
The aim of this study was to analyze the position of the lumbopelvic region and the muscle activation of erector spinae and biceps femoris muscles in a group of pregnant women in the third trimester. The hypothesis was that pregnancy-related biomechanical and morphological changes modify the position of the lumbopelvic region and the activation of extensor muscles. The position of the lumbar spine and pelvis in the sagittal plane, and the EMG activity of the erector spinae and biceps femoris muscles, were recorded during standing in 34 nulliparous and 34 pregnant women in the third trimester, and also two months after birth in the group of pregnant women. No significant differences in the position of the lumbar spine or pelvis between the group of pregnant women and nulliparous or postpartum were observed. A significant increase was observed in the EMG activity of the erector spinae (4.6% vs 2.4% and 2.1% in the nulliparous group and postpartum respectively) and the biceps femoris (3.4% vs 1.2% and 1.4%) in pregnant women compared to the other two groups (p <0.01). We conclude that pregnant women in the third trimester show no alterations in lumbopelvic position compared to nulliparous and postpartum women. However, there is an increase of the EMG activity of the trunk extensors. These results indicate that the extensor muscles of the trunk show, in static positions, adaptive responses to the increase of anterior loads during pregnancy.
本研究旨在分析一组处于妊娠晚期的孕妇的腰骶区位置和竖脊肌及股二头肌的肌肉激活情况。假设与妊娠相关的生物力学和形态学变化会改变腰骶区的位置和伸肌的激活。在 34 名初产妇和 34 名妊娠晚期的孕妇以及孕妇组产后两个月的站立位时，记录了腰椎和骨盆在矢状面的位置，以及竖脊肌和股二头肌的肌电图（EMG）活动。与初产妇和产后组相比，孕妇组腰椎或骨盆的位置没有显著差异。与初产妇和产后组相比，孕妇组竖脊肌（分别增加 4.6%、2.4%和 2.1%）和股二头肌（分别增加 3.4%、1.2%和 1.4%）的 EMG 活动显著增加（p<0.01）。我们得出结论，与初产妇和产后妇女相比，妊娠晚期的孕妇腰骶区位置没有改变。然而，躯干伸肌的 EMG 活动增加。这些结果表明，在静态位置下，躯干伸肌对妊娠期间前负荷的增加表现出适应性反应。
