Using nonlinear measures to evaluate postural control in healthy adults during bipedal standing on an unstable surface

• Autorzy: Kędziorek Justyna , Błażkiewicz Michalina , Kaczmarczyk Katarzyna

Identyfikatory

DOI

10.37190/ABB-01946-2021-02

• Języki publikacji: EN

Abstrakty

EN

This study examined the use of nonlinear measures – sample entropy (SampEn), fractal dimension (FD), and the Lyapunov exponent (LyE) – to evaluate postural control in adults during standing on an unstable surface, with and without visual feedback. Methods: 14 healthy young adults (24.07 ± 7.32 years) completed bipedal standing trials on an unstable-plate Biodex Balance System (BBS) connected to a Vicon system, with eyes open and closed. Each trial lasted 20 sec. Analysis was performed based on the center of mass (CoM), for which the three nonlinear measures were calculated. Results: Excluding visual feedback was found to cause a significant increase in linear and nonlinear parameters. Moreover, SampEn and FD values were found to be significantly higher in the PD direction, compared to AP or ML, whereas LyE values in this direction were minimal. Conclusions: Results show that the three nonlinear measures provide a useful way of evaluating postural control in healthy adults. Moreover, it seems that introducing an unstable surface meant that the projection of the CoM was not perpendicular to the surface, but rather set at a certain continually changing angle, forcing the whole system to adapt to chaotic and unpredictable conditions. Such refined changes in conditions can be evaluated in a precise way only by using nonlinear measures.

Słowa kluczowe

EN

fractal dimension; sample entropy; Lyapunov exponent; visual control; center of mass

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Acta of Bioengineering and Biomechanics
• Rocznik: 2022
• Tom: Vol. 24, no. 1
• Strony: 9--17
• Opis fizyczny: Bibliogr. 37 poz., rys., tab., wykr.

Twórcy

autor

Kędziorek Justyna

• The Józef Piłsudski University of Physical Education in Warsaw, Warsaw, Poland.

autor

Błażkiewicz Michalina

• The Józef Piłsudski University of Physical Education in Warsaw, Warsaw, Poland.

autor

Kaczmarczyk Katarzyna

• The Józef Piłsudski University of Physical Education in Warsaw, Warsaw, Poland.

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