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• W2017083047 endingPage "593" @default.
• W2017083047 startingPage "586" @default.
• W2017083047 abstract "Currently there is no commonly accepted way to define, much less quantify, locomotor stability. In engineering, orbital stability is defined using Floquet multipliers that quantify how purely periodic systems respond to perturbations discretely from one cycle to the next. For aperiodic systems, local stability is defined by local divergence exponents that quantify how the system responds to very small perturbations continuously in real time. Triaxial trunk accelerations and lower extremity sagittal plane joint angles were recorded from ten young healthy subjects as they walked for 10 min over level ground and on a motorized treadmill at the same speed. Maximum Floquet multipliers (Max FM) were computed at each percent of the gait cycle (from 0% to 100%) for each time series to quantify the orbital stability of these movements. Analyses of variance comparing Max FM values between walking conditions and correlations between Max FM values and previously published local divergence exponent results were computed. All subjects exhibited orbitally stable walking kinematics (i.e., magnitudes of Max FM < 1.0), even though these same kinematics were previously found to be locally unstable. Variations in orbital stability across the gait cycle were generally small and exhibited no systematic patterns. Walking on the treadmill led to small, but statistically significant improvements in the orbital stability of mediolateral (p = 0.040) and vertical (p = 0.038) trunk accelerations and ankle joint kinematics (p = 0.002). However, these improvements were not exhibited by all subjects (p < or = 0.012 for subject x condition interaction effects). Correlations between Max FM values and previously published local divergence exponents were inconsistent and 11 of the 12 comparisons made were not statistically significant (r2 < or = 19.8%; p > or = 0.049). Thus, the variability inherent in human walking, which manifests itself as local instability, does not substantially adversely affect the orbital stability of walking. The results of this study will allow future efforts to gain a better understanding of where the boundaries lie between locally unstable movements that remain orbitally stable and those that lead to global instability (i.e., falling)." @default.
• W2017083047 created "2016-06-24" @default.
• W2017083047 creator A5018062734 @default.
• W2017083047 creator A5027792075 @default.
• W2017083047 date "2006-12-06" @default.
• W2017083047 modified "2023-10-02" @default.
• W2017083047 title "Differences Between Local and Orbital Dynamic Stability During Human Walking" @default.
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• W2017083047 doi "https://doi.org/10.1115/1.2746383" @default.
• W2017083047 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17655480" @default.
• W2017083047 hasPublicationYear "2006" @default.
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