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Quantifying postural sway dynamics using burstiness and interevent time distributions

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Abstract

We propose an approach for analysing the dynamics of human postural sway using measures applied to study inhomogeneous temporal processes. Basically, we defined zero-crossings of center of pressure (COP) trajectories as events, obtained the sequence of interevent times and investigated the mean interevent time, the burstiness coefficient and the full functional form of the interevent time distribution. We applied this approach to data obtained for healthy young adults during quiet standing, under bipedal and unipedal conditions. We found that the proposed COP-based measures are able to detect differences between bipedal and unipedal postural sway temporal patterns, including the presence (or absence) of burstiness. We discussed the potential of this analysis to quantify temporal patterns of postural sway.

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Correspondence to Sergio Picoli.

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Picoli, S., Santos, E.S.D., Deprá, P.P. et al. Quantifying postural sway dynamics using burstiness and interevent time distributions. Eur. Phys. J. B 92, 156 (2019). https://doi.org/10.1140/epjb/e2019-90737-2

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