title: Characterizing the dynamics of postural sway in humans using smoothness and regularity measures.
abstract: We investigate human postural sway velocity time series by computing two dynamical statistics quantifying the smoothness (the central tendency measure or CTM) and the regularity (the sample entropy or SampEn) of their underlying dynamics. The purpose of the study is to investigate the effect of aging and vision on the selected measures and to explore the nature of postural dynamics by performing surrogate data tests. A group of 14 young subjects was compared to a group of 11 older healthy subjects in two visual conditions: with eyes open (EO) and with eyes closed (EC). The results suggest that vision and age do not influence the two statistics of the velocity data in the same way. More specifically, the smoothness statistic is able to detect the aging effect. The regularity measure is sensitive to the visual feedback removal. In contrast with some findings in the literature, the results of the surrogate data tests indicate that the center of pressure velocity dynamics are stochastic and are not produced by a purely deterministic behavior. Finally, we discuss some potential implications of our results in terms of postural control mechanisms.
authors.affiliation: Movement to Health Laboratory, Montpellier-1 University, EuroMov, 700, Av. du Pic Saint-Loup, 34090, Montpellier, France. sofiane.ramdani@univ-montp1.fr
authors.forename: Sofiane
authors.initials: S
authors.lastname: Ramdani
authors.forename: Benoît
authors.initials: B
authors.lastname: Seigle
authors.forename: Déborah
authors.initials: D
authors.lastname: Varoqui
authors.forename: Frédéric
authors.initials: F
authors.lastname: Bouchara
authors.forename: Hubert
authors.initials: H
authors.lastname: Blain
authors.forename: Pierre Louis
authors.initials: PL
authors.lastname: Bernard
mesh_terms: D000375:Aging / Q000502:physiology*; D001676:Biofeedback, Psychology / Q000502:physiology*; D003198:Computer Simulation; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008954:Models, Biological; D015233:Models, Statistical; D009068:Movement / Q000502:physiology*; D009949:Orientation / Q000502:physiology*; D004856:Postural Balance / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*; D055815:Young Adult