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Figure 1

From: Advantages and problems of nonlinear methods applied to analyze physiological time signals: human balance control as an example

Figure 1

Linear and nonlinear analyses of the seven balance tasks. Abbreviations: TF (two feet), OF (one foot), TB (two balls), OB (one ball), OE (open eyes), CE (closed eyes). Significant differences (Kruskal-Wallis test) are presented in Tables 1 and 2. The columns represent the mean values of the fifteen test persons who participated in the test series. Standard errors of mean (SEM) are also indicated. Analyses of the center of pressure (COP) sway in terms of standard deviations (SD) are shown in (a,b). (a) represents the SDs of the sway of the COP in (anterior-posterior) x-direction, and (b) in (medio-lateral) y-direction. The columns in (c) represent the Higuchi dimensions D H with respect to the x-component of the COP sway and (d) shows the D H values according to the y-component.

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