On the Measurement of Dynamic Stability of Human Locomotion

[+] Author and Article Information
Yildirim Hurmuzlu, Cagatay Basdogan

Mechanical Engineering Department, Southern Methodist University, Dallas, TX 75275

J Biomech Eng 116(1), 30-36 (Feb 01, 1994) (7 pages) doi:10.1115/1.2895701 History: Received September 14, 1992; Revised March 30, 1993; Online March 17, 2008


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.

Copyright © 1994 by The American Society of Mechanical Engineers
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