Next Article in Journal
Information Loss in Binomial Data Due to Data Compression
Next Article in Special Issue
Tunable-Q Wavelet Transform Based Multivariate Sub-Band Fuzzy Entropy with Application to Focal EEG Signal Analysis
Previous Article in Journal
An Approach to Data Analysis in 5G Networks
Previous Article in Special Issue
Univariate and Multivariate Generalized Multiscale Entropy to Characterise EEG Signals in Alzheimer’s Disease
Article

A Comparison of Postural Stability during Upright Standing between Normal and Flatfooted Individuals, Based on COP-Based Measures

1
Department of Industrial Engineering and Management, Yuan Ze University, Taoyuan, Chung-Li 32003, Taiwan
2
Department of Industrial Management, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
*
Author to whom correspondence should be addressed.
Entropy 2017, 19(2), 76; https://doi.org/10.3390/e19020076
Received: 31 October 2016 / Accepted: 14 February 2017 / Published: 16 February 2017
(This article belongs to the Special Issue Multivariate Entropy Measures and Their Applications)
Aging causes foot arches to collapse, possibly leading to foot deformities and falls. This paper proposes a set of measures involving an entropy-based method used for two groups of young adults with dissimilar foot arches to explore and quantize postural stability on a force plate in an upright position. Fifty-four healthy young adults aged 18–30 years participated in this study. These were categorized into two groups: normal (37 participants) and flatfooted (17 participants). We collected the center of pressure (COP) displacement trajectories of participants during upright standing, on a force plate, in a static position, with eyes open (EO), or eyes closed (EC). These nonstationary time-series signals were quantized using entropy-based measures and traditional measures used to assess postural stability, and the results obtained from these measures were compared. The appropriate combinations of entropy-based measures revealed that, with respect to postural stability, the two groups differed significantly (p < 0.05) under both EO and EC conditions. The traditional commonly-used COP-based measures only revealed differences under EO conditions. Entropy-based measures are thus suitable for examining differences in postural stability for flatfooted people, and may be used by clinicians after further refinement. View Full-Text
Keywords: center of pressure (COP); entropy; flatfoot; postural stability center of pressure (COP); entropy; flatfoot; postural stability
Show Figures

Figure 1

MDPI and ACS Style

Chao, T.-C.; Jiang, B.C. A Comparison of Postural Stability during Upright Standing between Normal and Flatfooted Individuals, Based on COP-Based Measures. Entropy 2017, 19, 76. https://doi.org/10.3390/e19020076

AMA Style

Chao T-C, Jiang BC. A Comparison of Postural Stability during Upright Standing between Normal and Flatfooted Individuals, Based on COP-Based Measures. Entropy. 2017; 19(2):76. https://doi.org/10.3390/e19020076

Chicago/Turabian Style

Chao, Tsui-Chiao; Jiang, Bernard C. 2017. "A Comparison of Postural Stability during Upright Standing between Normal and Flatfooted Individuals, Based on COP-Based Measures" Entropy 19, no. 2: 76. https://doi.org/10.3390/e19020076

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop