Catena Robert D, Chen Szu-Hua, Chou Li-Shan
Gait and Posture Biomechanics Lab, Kinesiology Program, Washington State University, Pullman, WA 99164-1410, USA.
Motion Analysis Lab, Department of Human Physiology, University of Oregon, Eugene, OR, USA.
J Biomech. 2017 Jul 5;59:23-28. doi: 10.1016/j.jbiomech.2017.05.007. Epub 2017 May 17.
Examining whole-body center of mass (COM) motion is one of method being used to quantify dynamic balance and energy during gait. One common method for estimating the COM position is to apply an anthropometric model to a marker set and calculate the weighted sum from known segmental COM positions. Several anthropometric models are available to perform such a calculation. However, to date there has been no study of how the anthropometric model affects whole-body COM calculations during gait. This information is pertinent to researchers because the choice of anthropometric model may influence gait research findings and currently the trend is to consistently use a single model. In this study we analyzed a single stride of gait data from 103 young adult participants. We compared the whole-body COM motion calculated from 4 different anthropometric models (Plagenhoef et al., 1983; Winter, 1990; de Leva, 1996; Pavol et al., 2002). We found that anterior-posterior motion calculations are relatively unaffected by the anthropometric model. However, medial-lateral and vertical motions are significantly affected by the use of different anthropometric models. Our findings suggest that the researcher carefully choose an anthropometric model to fit their study populations when interested in medial-lateral or vertical motions of the COM. Our data can provide researchers a priori information on the model determination depending on the particular variable and how conservative they may want to be with COM comparisons between groups.
研究全身质心（COM）运动是用于量化步态中动态平衡和能量的方法之一。估计质心位置的一种常用方法是将人体测量模型应用于标记集，并根据已知的节段质心位置计算加权和。有几种人体测量模型可用于执行此类计算。然而，迄今为止，尚未有关于人体测量模型如何影响步态期间全身质心计算的研究。该信息与研究人员相关，因为人体测量模型的选择可能会影响步态研究结果，并且目前的趋势是始终使用单一模型。在本研究中，我们分析了103名年轻成年参与者的单步步态数据。我们比较了由4种不同人体测量模型（Plagenhoef等人，1983年；Winter，1990年；de Leva，1996年；Pavol等人，2002年）计算出的全身质心运动。我们发现前后运动计算相对不受人体测量模型的影响。然而，左右和垂直运动受到不同人体测量模型使用的显著影响。我们的研究结果表明，当研究人员对质心的左右或垂直运动感兴趣时，应仔细选择适合其研究人群的人体测量模型。我们的数据可以根据特定变量以及他们在组间质心比较中希望保守的程度，为研究人员提供关于模型确定的先验信息。
