Department of Mechanical Engineering and School of Physiotherapy, University of Melbourne, Australia.
Gait Posture. 2010 Feb;31(2):292-3. doi: 10.1016/j.gaitpost.2009.11.004. Epub 2009 Dec 14.
This study aimed to quantify the effect of combining the measurements from force plates when a subject's foot comes in contact with more than one force plate. A 3-Dimensional Gait Analysis (3DGA) was performed on a subject walking barefoot. Ten gait trials (good both) were captured where both subject's feet hit a single force plate. Then 20 gait trials (two force plates) were captured where either the right or left subject's foot was in contact with two force plates at a time. Kinematics were computed with VICON Plugin Gait and kinetics with a BodyLanguage (VICON, Oxford, UK) model that allowed the combination of force plate measurements. The kinetics traces from both sets of data were compared using variance component analysis. Results suggest that effects of how the moments were calculated were at most a third of those arising from stride to stride variability. This suggests that development of automated systems for determining foot contact coupled with arrays of more and smaller force plates than are commonly used might be useful to ensure the capture of good quality kinetic data in a wide range of patients.
本研究旨在量化当受试者的脚同时接触多个测力板时，将来自测力板的测量值组合起来的效果。对赤脚行走的受试者进行了三维步态分析（3DGA）。记录了十个步态试验（均良好），其中受试者的双脚都踩到了一个测力板。然后，记录了二十个步态试验（两个测力板），其中受试者的右脚或左脚一次与两个测力板接触。运动学是通过 VICON 插件步态计算的，动力学是通过 BodyLanguage（VICON，英国牛津）模型计算的，该模型允许测力板测量值的组合。使用方差分量分析比较了两组数据的动力学轨迹。结果表明，计算力矩的影响最多只有步间变异性产生的影响的三分之一。这表明，开发用于确定脚接触的自动化系统以及比通常使用的更多和更小的测力板阵列可能有助于确保在广泛的患者中捕获高质量的动力学数据。
