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International Journal of Bifurcation and Chaos, 21(4), 1163–1172p. (2011) DOI:10.1142/S021812741102891X
During quiet standing the human body continuously moves about an upright posture in an erratic fashion. Conventional posturographic analyses that ignore structure of postural steadiness time series do not fully characterize properties of sway dynamics. Recurrence quantification analysis is a technique that can extract the dynamics of postural fluctuations through several variables. In this study standing still sway dynamics of intact and deteriorated postural control systems were investigated by recurrence quantification of stabilograms. The results indicated that both normal and changed postural fluctuations time series, despite erratic and irregular appearance, contain a hidden structure. Although the two components of postural sway originate from an integrated control system, they exhibit distinct dynamical patterns. More determinism, greater stability and higher degrees of non stationarity were observed in fore-aft movements. Our findings reveal that decay of postural control mechanism affects dynamical properties of postural control system (especially along mediolateral direction because of the type of the impairment). Determinism, non stationarity and rigidity of balance program are increased due to deterioration of postural control system. These findings imply that these measures not only can be used as the pathologic measures to discriminate between groups differences but also provide new openings to understand the nature postural sway.
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