The static standing postural stability measured by average entropy

Sung Yang Wei, Chang Francis Hsu, Yun Ju Lee, Long Hsu, Sien Chi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Static standing postural stability has been measured by multiscale entropy (MSE), which is used to measure complexity. In this study, we used the average entropy (AE) to measure the static standing postural stability, as AE is a good measure of disorder. The center of pressure (COP) trajectories were collected from 11 subjects under four kinds of balance conditions, from stable to unstable: bipedal with open eyes, bipedal with closed eyes, unipedal with open eyes, and unipedal with closed eyes. The AE, entropy of entropy (EoE), and MSE methods were used to analyze these COP data, and EoE was found to be a good measure of complexity. The AE of the 11 subjects sequentially increased by 100% as the balance conditions progressed from stable to unstable, but the results of EoE and MSE did not follow this trend. Therefore, AE, rather than EoE or MSE, is a good measure of static standing postural stability. Furthermore, the comparison of EoE and AE plots exhibited an inverted U curve, which is another example of a complexity versus disorder inverted U curve.

Original languageEnglish
Article number1210
Issue number12
StatePublished - Dec 2019


  • Average entropy (AE)
  • Biological complexity
  • Biological disorder
  • Center of pressure (COP)
  • Entropy of entropy (EoE)
  • Inverted U curve
  • Multiscale entropy (MSE)

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