Division of Exercise Physiology, Department of Human Performance and Applied Exercise Science, West Virginia University, Morgantown, WV 26506-9227, USA.
Gait Posture. 2011 Oct;34(4):524-8. doi: 10.1016/j.gaitpost.2011.07.007. Epub 2011 Aug 5.
Pregnant women are at a high risk of experiencing a fall. To our knowledge, ground reaction forces (GRFs) in pregnant fallers and non-fallers have not been reported.
The purpose of this study was to examine the effects of pregnancy and fall history on GRFs during walking.
Forty one pregnant subjects in the mid 2nd and 3rd trimesters (pregnant fallers: n=15, pregnant non-fallers: n=14), and 40 control women walked at a freely chosen walking speed along an 8m walkway. A force plate, hidden in the walkway, was used to collect GRFs (1080Hz). Kinematic data (120Hz) were collected from a marker placed on the lumbar spine to estimate walking velocity. GRF variables included mediolateral Center of Pressure (COP) excursion, and GRFs normalized to body mass. A two factor ANOVA (trimester x fall group) was used to compare subject demographics, and walking velocity (α=0.05). A two factor ANCOVA (trimester×fall group, covariate: velocity) was performed to examine other GRF variables (Bonferroni corrected α=0.006) and the mediolateral COP excursion (α=0.05).
Walking velocity was greater in the control group (p<0.05). No differences were seen in the GRFs or COP movement between trimesters or between pregnant fallers and non-fallers.
When walking velocity was considered in the statistical model, ground reaction forces are essentially unchanged by pregnancy.
孕妇有很高的跌倒风险。据我们所知，还没有报道过孕妇跌倒者和非跌倒者的地面反力（GRF）。
本研究的目的是研究妊娠和跌倒史对行走时 GRF 的影响。
41 名处于妊娠中期和晚期（妊娠跌倒者：n=15，妊娠非跌倒者：n=14）的孕妇和 40 名对照女性以自由选择的步行速度沿 8m 走道行走。力板隐藏在走道中，用于收集 GRF（1080Hz）。从放置在腰椎上的标记收集运动学数据（120Hz）以估计步行速度。GRF 变量包括横向中心压力（COP）偏移量和归一化到体重的 GRF。使用两因素 ANOVA（妊娠阶段 x 跌倒组）比较受试者的人口统计学数据和步行速度（α=0.05）。进行两因素协方差分析（妊娠阶段×跌倒组，协变量：速度），以检查其他 GRF 变量（经 Bonferroni 校正的α=0.006）和横向 COP 偏移量（α=0.05）。
对照组的步行速度更快（p<0.05）。在妊娠阶段或在孕妇跌倒者和非跌倒者之间，GRF 或 COP 运动没有差异。
当在统计模型中考虑步行速度时，妊娠对地面反力基本没有影响。
