This study quantified the relationships between local dynamic stability and variability during continuous overground and treadmill walking. Stride-to-stride standard deviations were computed from temporal and kinematic data. Maximum finite-time Lyapunov exponents were estimated to quantify local dynamic stability. Local stability of gait kinematics was shown to be achieved over multiple consecutive strides. Traditional measures of variability poorly predicted local stability. Treadmill walking was associated with significant changes in both variability and local stability. Thus, motorized treadmills may produce misleading or erroneous results in situations where changes in neuromuscular control are likely to affect the variability and/or stability of locomotion.
Local Dynamic Stability Versus Kinematic Variability of Continuous Overground and Treadmill Walking
Contributed by the Bioengineering Division for publication in the JOURNAL OF BIOMECHANICAL ENGINEERING. Manuscript received by the Bioengineering Division September 30, 1999; revised manuscript received October 16, 2000. Associate Editor: M. G. Prandy.
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Dingwell, J. B., Cusumano, J. P., Cavanagh, P. R., and Sternad, D. (October 16, 2000). "Local Dynamic Stability Versus Kinematic Variability of Continuous Overground and Treadmill Walking ." ASME. J Biomech Eng. February 2001; 123(1): 27–32. https://doi.org/10.1115/1.1336798
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