Abstract
Parameters of different vertical two-leg stances are studied by the force platform measurements on a control group of young healthy individuals and two groups of patients with spine and joint pathologies. Body sway patterns are classified and analyzed and some new indexes are proposed for clinical diagnostics of the spine and joint pathologies. The dependencies between the body accelerations in the frontal and sagittal planes are proposed for the estimation of the resulting feedback force that provides stable vertical stance. The spectral and wavelet analyses are used for the detection of the quasi-regular and chaotic behavior in the dynamics of postural sway. It is shown that the amplitudes and power spectral densities of the center of the pressure coordinates are subjected to periodic oscillations, which are not in phase for different frequencies. The quasi-regular behavior is proper to the young healthy volunteers, while most of the patients with combined spine and joint impairments demonstrate the chaotic dynamics of the body sway.
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Kizilova, N., Karpinska, E., Karpinsky, M. (2014). Quasi-regular and Chaotic Dynamics of Postural Sway in Human. In: Awrejcewicz, J. (eds) Applied Non-Linear Dynamical Systems. Springer Proceedings in Mathematics & Statistics, vol 93. Springer, Cham. https://doi.org/10.1007/978-3-319-08266-0_8
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DOI: https://doi.org/10.1007/978-3-319-08266-0_8
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