Changes in segment mass and mass distribution during pregnancy
Changes in segment mass and mass distribution during pregnancy
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DOI：
10.1016/0021-9290(95)00042-9
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发表时间：
1996-02-01
影响因子：
2.4
通讯作者：
Treitz, T
中科院分区：
文献类型：
--
作者：
Jensen, RK;Doucet, S;Treitz, T
该研究的目的是评估在怀孕的第二个和第三个三个月期间的估计质量和身体部分的主惯性矩的变化率。15例受试者，平均妊娠15.1周，每月进行一次检测，直至足月。主体被建模为16个节段，由在横向平面中切片的2 cm堆叠椭圆柱体组成。将线性回归拟合至节段惯性，并确定个体生长曲线的回归系数。下躯干质量的平均增长率为每周0.29 kg，横轴主力矩的平均增长率为每周0.0069 kgm（2）。然后测试了节段平均值之间的差异;质量变化率和三个主要力矩。用于检验差异的所有四个ANOVA均具有显著性。事后分析确定，在第二和第三个三个月的躯干惯性增加率比所有其他部分，其余部分之间没有显着差异。这种变化的影响，在躯干段的质量和主要的时刻，说明了一个怀孕的受试者，其下躯干质量从21.6公斤增加到28.4公斤的坐到站的intersegmental动态分析。一个人的节惯性的差异的知识，应导致更好地了解如何在怀孕期间的运动受到影响。
The purpose of the study was to evaluate the rates of change in the estimated masses and principal moments of inertia of the body segments during the second and third trimesters of pregnancy. Fifteen subjects, on average 15.1 weeks pregnant, were tested monthly until term. The body was modelled as 16 segments consisting of 2 cm stacked elliptical cylinders sectioned in the transverse plane. Linear regressions were fitted to the segment inertias and regression coefficients determined for the individual growth curves. The mean rate of increase for the lower trunk mass was 0.29 kg per week and 0.0069 kgm(2) per week for the transverse axis principal moment. Differences between the means of the segments; for rates of change of mass and the three principal moments were then tested. All four ANOVAs used to test the differences were significant. The post hoc analysis established that over the second and third trimesters the lower trunk inertias increased at a greater rate than all other segments and there were no significant differences between the remaining segments. The effect of such changes in the trunk segment masses and principal moments was illustrated by an analysis of intersegmental dynamics during a sit to stand of one pregnant subject whose lower trunk mass increased from 21.6 kg to 28.4 kg. A knowledge of the differences in an individual's segment inertias should lead to a better understanding of how movements are affected during pregnancy.