Comparison of the COM-FCP inclination angle and other mediolateral stability indicators for turning.
Comparison of the COM-FCP inclination angle and other mediolateral stability indicators for turning.
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COM-FCP 倾斜角与其他转弯内侧稳定性指标的比较。
DOI：
10.1186/s12938-017-0325-z
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发表时间：
2017-03-24
影响因子：
3.9
通讯作者：
Ming D
中科院分区：
文献类型：
--
作者：
Xu R;Wang X;Yang J;He F;Zhao X;Qi H;Zhou P;Ming D
研究背景研究表明，转弯比直线行走更容易引起不稳定性，而且不稳定性随着转弯角度的增加而增加。然而，稳定性变化与曲率和车削步长的精确关系尚不清楚。传统的质心（COM）-压力中心（COP）倾角需要使用测力板。一个COM-脚接触点（FCP）的倾斜角来自运动学数据，提出了在这项研究中作为衡量的稳定性turning.MethodsIn为了产生不同程度的稳定性，我们设计了一个实验，步行不同的曲率和步长。同时，提出了一种新的方法来计算COM-FCP倾角的不同步行轨迹与不同的步长为10名健康受试者。COM-FCP倾斜角，COM加速度，步长和COM-踝关节倾斜角进行了统计analysed.ResultsThe统计结果表明，内外侧（ML）COM-FCP倾斜角增加显着的曲率的步行轨迹或步长在圆形步行增加。通过ML COM加速度、步宽和ML COM-踝倾角的变化验证了该方法的可行性和可靠性。此外，ML COM-FCP倾斜角是更敏感的ML稳定性比ML COM-踝关节倾角angle.ConclusionsThe工作表明，它是更难保持平衡时，走在一个圆形的轨迹具有较大的曲率或在一个较大的步长。本质上，在一步中以较大角度转动导致较低的ML稳定性。验证了一种新的COM-FCP倾角来指示ML稳定性。这种方法可以应用于复杂的行走任务，其中力板是不适用的，它占的变化的基础上的支持（BOS）相比，COM踝关节倾角。
BackgroundStudies have shown that turning is associated with more instability than straight walking and instability increases with turning angles. However, the precise relationship of changes in stability with the curvature and step length of turning is not clear. The traditional center of mass (COM)-center of pressure (COP) inclination angle requires the use of force plates. A COM-foot contact point (FCP) inclination angle derived from kinematic data is proposed in this study as a measure of the stability of turning.MethodsIn order to generate different degrees of stability, we designed an experiment of walking with different curvatures and step lengths. Simultaneously, a novel method was proposed to calculate the COM-FCP inclination angles of different walking trajectories with different step lengths for 10 healthy subjects. The COM-FCP inclination angle, the COM acceleration, the step width and the COM-ankle inclination angles were statistically analyzed.ResultsThe statistical results showed that the mediolateral (ML) COM-FCP inclination angles increased significantly as the curvature of the walking trajectories or the step length in circular walking increased. Changes in the ML COM acceleration, the step width and the ML COM-ankle inclination angle verified the feasibility and reliability of the proposed method. Additionally, the ML COM-FCP inclination angle was more sensitive to the ML stability than the ML COM-ankle inclination angle.ConclusionsThe work suggests that it is more difficult to keep balance when walking in a circular trajectory with a larger curvature or in a larger step length. Essentially, turning with a larger angle in one step leads to a lower ML stability. A novel COM-FCP inclination angle was validated to indicate ML stability. This method can be applied to complicated walking tasks, where the force plate is not applicable, and it accounts for the variability of the base of support (BOS) compared to the COM-ankle inclination angle.