Human Movement Laboratory, Research Centre, Saint-Justine Hospital, Montreal, QC H3T 1C5, Canada.
IEEE Trans Biomed Eng. 2011 May;58(5):1278-85. doi: 10.1109/TBME.2010.2100394. Epub 2010 Dec 20.
Classical models to estimate the head and trunk (HT) moments of inertia (I) are limited to populations from which the anthropometric measures were obtained. The purposes of this study were to determine if the angular momentum technique can be used to estimate subject-specific HT's I values and test its validity and sensitivity. Twenty-three adults who participated in this study were divided into three morphological groups according to their body mass index (BMI). Using the proposed technique, the HT's I values were estimated for the whole sample and compared to three well-known methods to test its validity. The sensitivity of the proposed method was verified while applied to individuals with different BMI (i.e., lean, normal, and obese). The angular momentum technique gave I values within the range of those of the three methods for the entire sample. Statistical differences were identified between the lean and obese groups in relative radii of gyration for the anteroposterior and mediolateral axes ( P<0.05). Since the proposed technique makes no assumption on the mass distribution and segments' geometry, it appeared to be more sensitive to body morphology changes in estimating the HT's I values in lean and obese subjects compared to the classical methods.
经典模型来估算头部和躯干（HT）的转动惯量（I）仅限于获得人体测量学数据的人群。本研究的目的是确定角动量技术是否可用于估计特定于个体的 HT 的 I 值，并测试其有效性和敏感性。根据体重指数（BMI），将 23 名参加本研究的成年人分为三组。使用提出的技术，估算了整个样本的 HT 的 I 值，并与三种著名的方法进行了比较以测试其有效性。验证了该方法在应用于具有不同 BMI（即瘦、正常和肥胖）的个体时的敏感性。角动量技术给出的 I 值在整个样本中均在三种方法的范围内。瘦组和肥胖组在前后轴和内外轴的相对转动半径方面存在统计学差异（P<0.05）。由于该技术对质量分布和节段几何形状没有任何假设，因此在估计瘦和肥胖个体的 HT 的 I 值时，与经典方法相比，它似乎对身体形态变化更敏感。
