Division of Applied Biomedical Research, King's College London, Guy's Campus, London Bridge, London SE1 1UL, UK.
Gait Posture. 2010 Feb;31(2):164-8. doi: 10.1016/j.gaitpost.2009.09.018. Epub 2009 Oct 24.
Stair climbing can be measured using body-fixed sensors, whereby the origin and axes of the coordinate system are fixed with respect to the geometry of a body segment. These sensors can be part of a portable system, which provides the possibility to collect data in complex real-life environments. However due to the fact that the sensors are body-fixed, difficulties in determining the ground-based parameters of stair ascent can occur. The purpose of this study is to present a new approach for determining initial contacts based on a multi-chain biomechanical model combined with a new analysis method, in which relative hip height is compared to hip height during normal standing. Initial contacts obtained from the proposed method were compared to those obtained using an optical tracking device. An average absolute timing difference ranging from 0.04 (SD + or - 0.03) to 0.06 (+ or - 0.03) s and a root mean square error ranging from 0.05 to 0.07 s were found between the two techniques. This shows that the new approach presented in this study can be used to accurately determine initial contacts during stair ascent using portable equipment.
爬楼梯可以使用固定在身体上的传感器进行测量，其中坐标系的原点和轴相对于身体某一部位的几何形状是固定的。这些传感器可以作为便携式系统的一部分，为在复杂的现实环境中收集数据提供了可能。然而，由于传感器是固定在身体上的，因此在确定楼梯上升的地面参数时可能会遇到困难。本研究的目的是提出一种新的方法，基于多链生物力学模型和一种新的分析方法，利用该方法可以确定基于相对髋关节高度与正常站立时髋关节高度比较的初始接触点。与使用光学跟踪装置获得的初始接触点相比，所提出方法获得的初始接触点的平均绝对时间差异在 0.04(SD ± 0.03)s 到 0.06(± 0.03)s 之间，均方根误差在 0.05 到 0.07 s 之间。这表明，本研究提出的新方法可以使用便携式设备准确地确定楼梯上升过程中的初始接触点。
