Comparison of kinematic and kinetic methods for computing the vertical motion of the body center of mass during walking
Comparison of kinematic and kinetic methods for computing the vertical motion of the body center of mass during walking
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DOI：
10.1016/j.humov.2003.11.002
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发表时间：
2004-04-01
影响因子：
2.1
通讯作者：
Kuo, AD
中科院分区：
文献类型：
--
作者：
Gard, SA;Miff, SC;Kuo, AD
使用运动分析实验室常用的三种不同技术计算身体质心（BCOM）的垂直偏移。骶骨标记方法涉及通过跟踪放置在受试者骶骨上的反射标记的位置来估计垂直BCOM运动。身体节段分析技术从数据试验期间采集的每帧运动学数据的各个身体节段的质心的垂直位置的加权平均值确定BCOM的垂直运动。利用人体数据前标准表确定各节段的质量分数和质心位置。第三种技术涉及通过力平台数据的双重积分来计算BCOM垂直运动。数据采集自10名身体健全的成年研究受试者（5名男性和5名女性），他们以0.8、1.2、1.6和2.0 m/s的速度行走。重复测量方差分析表明，在最低步行速度下，所有三种技术计算的垂直偏移相似，但在更快的速度下，骶骨标记物显著（p < 0.001）高估了BCOM的垂直偏移。在所有步行速度下，身体节段分析和力平台技术均一致。骶骨标记方法和其他两种技术之间的差异使用一个简单的模型进行了解释;在双支撑阶段的腿的相互配置显着提高了躯干内的BCOM的位置在更长的步长，对应于更快的步行速度。骶骨标记方法可以提供一个合理的近似垂直BCOM运动在缓慢和自由选择的速度健全的步行。然而，身体节段分析或力平台技术可能会产生更好的估计，在更快的步行速度或步态病理的人。(C)2003 Elsevier B. V.保留所有权利。
The vertical excursion of the body center of mass (BCOM) was calculated using three different techniques commonly used by motion analysis laboratories. The sacral marker method involved estimating vertical BCOM motion by tracking the position of a reflective marker that was placed on the sacrum of subjects as they walked. The body segmental analysis technique determined the vertical motion of the BCOM from a weighted average of the vertical positions of the centers of mass of individual body segments for each frame of kinematic data acquired during the data trial. Anthropomorphic data front standard tables were used to determine the mass fractions and the locations of the centers of mass of each body segment. The third technique involved calculating BCOM vertical motion through double integration of force platform data. Data was acquired from 10 able-bodied, adult research subjects - 5 males and 5 females - walking at speeds of 0.8, 1.2, 1.6, and 2.0 m/s. A repeated measures ANOVA indicated that at the slowest walking speed the vertical excursions calculated by all three techniques were similar, but at faster speeds the sacral marker significantly (p < 0.001) overestimated the vertical excursion of the BCOM compared with the other two methods. The body segmental analysis and force platform techniques were in agreement at all walking speeds. Discrepancies between the sacral marker method and the other two techniques were explained using a simple model; the reciprocal configuration of the legs during double support phase significantly raises the position of the BCOM within the trunk at longer step lengths, corresponding to faster walking speeds. The sacral marker method may provide a reasonable approximation of vertical BCOM motion at slow and freely selected speeds of able-bodied walking. However, the body segmental analysis or force platform techniques will probably yield better estimates at faster walking speeds or in persons with gait pathologies. (C) 2003 Elsevier B.V. All rights reserved.