Li Y, Dangerfield P H
Department of Human Anatomy and Cell Biology, University of Liverpool.
Ann Hum Biol. 1993 Sep-Oct;20(5):433-54. doi: 10.1080/03014469300002842.
The water displacement method was used in this study to obtain volume distribution data on limb segments. A mathematical method was then applied to those data to calculate the values for centre of gravity, radius of gyration, principal moment of inertia, and volume. The results showed the water displacement method is not sensitive to random error, while giving a good estimation of inertial properties. Centre of gravity, expressed as percentage of segment length, has a very small variance; the variance of radius of gyration was even smaller. These two variables show sex-related differences, the former also displaying differences relating to age, especially for multi-segment units such as the forearm with hand. The principal moment of inertia and volume were highly correlated with anthropometric variables. Volume ratios had significant sex and age differences, absent for the absolute value for volumes. Since the results demonstrated characteristics absent from conventional anthropometric investigation, the inertial properties may find an application as new indicators of children's growth. It has also noted that the results from previous studies had different results for some inertial characteristics, indicating a need for further studies of the inertial properties of the human body.
本研究采用排水法获取肢体节段的体积分布数据。然后将一种数学方法应用于这些数据，以计算重心、回转半径、主惯性矩和体积的值。结果表明，排水法对随机误差不敏感，同时能很好地估计惯性特性。以节段长度百分比表示的重心方差非常小；回转半径的方差甚至更小。这两个变量存在性别差异，前者还显示出与年龄有关的差异，特别是对于像前臂连手这样的多节段单元。主惯性矩和体积与人体测量变量高度相关。体积比存在显著的性别和年龄差异，而体积绝对值则不存在这种差异。由于结果显示了传统人体测量学研究中不存在的特征，惯性特性可能作为儿童生长的新指标得到应用。还应指出的是，先前研究的结果在一些惯性特征方面存在不同结果，这表明有必要对人体的惯性特性进行进一步研究。
