Catena Robert D, Connolly Christopher P, McGeorge Kendra M, Campbell Nigel
Gait and Posture Biomechanics Lab, Kinesiology program, Washington State University, Pullman, WA, USA.
Exercise Physiology and Performance Lab, Kinesiology program, Washington State University, Pullman, WA, USA.
J Biomech. 2018 Apr 11;71:217-224. doi: 10.1016/j.jbiomech.2018.02.004. Epub 2018 Feb 12.
Balance changes during pregnancy likely occur because of mass gains and mass distribution changes. However, to date there is no way of tracking balance through center of mass motion because no method is available to identify of the body center of mass throughout pregnancy. We compared methods for determining segment masses and torso center of mass location. The availability of a method for tracking these changes during pregnancy will make determining balance changes through center of mass motion an option for future pregnancy balance research. Thirty pregnant women from eight weeks gestation until birth were recruited for monthly anthropometric measurements, motion capture analysis of body segment locations, and force plate analysis of center of pressure during quiet standing and supine laying. From these measurements, we were able to compare regression, volume measurement, and weighted sum methods to calculate body center of mass throughout pregnancy. We found that mass changes around the trunk were most prevalent as expected, but mass changes throughout the body (especially the thighs) were also seen. Our findings also suggest that a series of anthropometric measurements first suggested by Pavol et al. (2002), in combination with quiet standing on a force plate, can be used to identify the needed components (segment masses and torso center of mass location in three dimensions) to calculate body center of mass changes during pregnancy. The results of this study will make tracking of center of mass motion a possibility for future pregnancy balance research.
孕期的平衡变化可能是由于体重增加和体重分布改变所致。然而，迄今为止，由于尚无方法在整个孕期识别身体的质心，因此无法通过质心运动来追踪平衡。我们比较了确定各节段质量和躯干质心位置的方法。若能有一种方法在孕期追踪这些变化，那么通过质心运动来确定平衡变化将成为未来孕期平衡研究的一种选择。招募了30名从妊娠8周直至分娩的孕妇，每月进行人体测量、身体各节段位置的动作捕捉分析以及安静站立和仰卧时的压力中心测力台分析。通过这些测量，我们能够比较回归法、体积测量法和加权和法来计算整个孕期的身体质心。我们发现，正如预期的那样，躯干周围的质量变化最为普遍，但全身（尤其是大腿）的质量变化也很明显。我们的研究结果还表明，帕沃尔等人（2002年）首次提出的一系列人体测量方法，结合在测力台上安静站立，可用于识别计算孕期身体质心变化所需的组成部分（各节段质量和三维空间中的躯干质心位置）。这项研究的结果将使未来孕期平衡研究追踪质心运动成为可能。
