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• W2068804769 abstract "In steady-state walking, fluctuations in space-time behavior are observed for normal adult subjects. In the present study, the intrinsic fluctuations of gait have been analyzed when walking on a subject-driven treadmill (with adjustable inertial forces). Furthermore, these intrinsic fluctuations have been compared with those observed in natural overground locomotion which involves a real subject's displacement and thus an optical flow. Four adult subjects participated in both experimental sessions. It was found that the frequency and amplitude of the instantaneous fluctuations of leg movement were weak and of equal magnitude with or without optical flow. This was also the case for instantaneous fluctuations in displacement speed. Secondly, a low-frequency fluctuation in walking speed was observed when no optical flow information was available to the subject. This fluctuation results from the addition of a series of leg-movement fluctuations, whose values are all either positive or negative. As the optical flow provides information about the displacement speed, it allows the subject to avoid such addition, and thus plays a role in maintaining steady leg movement. Theoretical models linking space-time behavior of rhythmic movement with stiffness10 strongly suggest that the observed low-frequency fluctuations in speed result from fluctuations in stiffness." @default.
• W2068804769 created "2016-06-24" @default.
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• W2068804769 date "1992-04-01" @default.
• W2068804769 modified "2023-09-30" @default.
• W2068804769 title "Steady-state fluctuations of human walking" @default.
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• W2068804769 doi "https://doi.org/10.1016/s0166-4328(05)80124-x" @default.
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