Hurmuzlu Y, Basdogan C
Mechanical Engineering Department, Southern Methodist University, Dallas, TX 75275.
J Biomech Eng. 1994 Feb;116(1):30-6. doi: 10.1115/1.2895701.
The main focus of the present investigation is the development of quantitative measures to assess the dynamic stability of human locomotion. The analytical methodology is based on Floquet theory, which was developed to investigate the stability of nonlinear oscillators. Here the basic approach is modified such that it accommodates the study of the complex dynamics of human locomotion and differences among various individuals. A quantitative stability index has been developed to characterize the ability of humans to maintain steady gait patterns. Floquet multipliers of twenty normal subjects were computed from the kinematic data at Poincaré sections taken at four instants of the gait cycle, namely heel strike, foot flat, heel off, and toe off. Then, an averaged stability index was computed for each subject. Statistical analysis was performed to demonstrate the utility of the stability indices as quantitative measures of dynamic stability of gait for the subject population tested during the present study.
本研究的主要重点是开发定量测量方法，以评估人类运动的动态稳定性。分析方法基于弗洛凯理论，该理论是为研究非线性振荡器的稳定性而发展起来的。在此，对基本方法进行了修改，使其能够适应对人类运动复杂动力学以及不同个体之间差异的研究。已开发出一种定量稳定性指数，以表征人类维持稳定步态模式的能力。从步态周期的四个时刻（即脚跟触地、足放平、脚跟离地和脚趾离地）的庞加莱截面处的运动学数据中计算出20名正常受试者的弗洛凯乘数。然后，为每个受试者计算平均稳定性指数。进行统计分析以证明稳定性指数作为本研究中测试的受试者群体步态动态稳定性定量测量指标的效用。
