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Entropy 2015, 17(12), 7926-7947; doi:10.3390/e17127849

Multiscale Entropy Analysis of Center-of-Pressure Dynamics in Human Postural Control: Methodological Considerations

1
Osher Center for Integrative Medicine, Brigham and Women’s Hospital, Harvard Medical School, 900 Commonwealth Ave., Boston, MA 02215, USA
2
Division of Interdisciplinary Medicine and Biotechnology, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Ave., Boston, MA 02215, USA
3
Division of General Medicine and Primary Care, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Ave., Boston, MA 02115, USA
4
Martinos Center for Biomedical Imaging, Massachusetts General Hospital, 149 13th St, Charlestown, MA 02129, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Anne Humeau-Heurtier
Received: 24 September 2015 / Revised: 18 November 2015 / Accepted: 19 November 2015 / Published: 30 November 2015
(This article belongs to the Special Issue Multiscale Entropy and Its Applications in Medicine and Biology)
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Abstract

Multiscale entropy (MSE) is a widely used metric for characterizing the nonlinear dynamics of physiological processes. Significant variability, however, exists in the methodological approaches to MSE which may ultimately impact results and their interpretations. Using publications focused on balance-related center of pressure (COP) dynamics, we highlight sources of methodological heterogeneity that can impact study findings. Seventeen studies were systematically identified that employed MSE for characterizing COP displacement dynamics. We identified five key methodological procedures that varied significantly between studies: (1) data length; (2) frequencies of the COP dynamics analyzed; (3) sampling rate; (4) point matching tolerance and sequence length; and (5) filtering of displacement changes from drifts, fidgets, and shifts. We discuss strengths and limitations of the various approaches employed and supply flowcharts to assist in the decision making process regarding each of these procedures. Our guidelines are intended to more broadly inform the design and analysis of future studies employing MSE for continuous time series, such as COP. View Full-Text
Keywords: multiscale entropy; sample entropy; methodological; center of pressure; systematic review multiscale entropy; sample entropy; methodological; center of pressure; systematic review
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Gow, B.J.; Peng, C.-K.; Wayne, P.M.; Ahn, A.C. Multiscale Entropy Analysis of Center-of-Pressure Dynamics in Human Postural Control: Methodological Considerations. Entropy 2015, 17, 7926-7947.

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