Annals of Biomedical Engineering

, Volume 44, Issue 5, pp 1636–1645 | Cite as

Comparing Postural Stability Entropy Analyses to Differentiate Fallers and Non-fallers

  • Peter C. Fino
  • Ahmad R. Mojdehi
  • Khaled Adjerid
  • Mohammad Habibi
  • Thurmon E. Lockhart
  • Shane D. Ross
Article

Abstract

The health and financial cost of falls has spurred research to differentiate the characteristics of fallers and non-fallers. Postural stability has received much of the attention with recent studies exploring various measures of entropy. This study compared the discriminatory ability of several entropy methods at differentiating two paradigms in the center-of-pressure of elderly individuals: (1) eyes open (EO) vs. eyes closed (EC) and (2) fallers (F) vs. non-fallers (NF). Methods were compared using the area under the curve (AUC) of the receiver-operating characteristic curves developed from logistic regression models. Overall, multiscale entropy (MSE) and composite multiscale entropy (CompMSE) performed the best with AUCs of 0.71 for EO/EC and 0.77 for F/NF. When methods were combined together to maximize the AUC, the entropy classifier had an AUC of for 0.91 the F/NF comparison. These results suggest researchers and clinicians attempting to create clinical tests to identify fallers should consider a combination of every entropy method when creating a classifying test. Additionally, MSE and CompMSE classifiers using polar coordinate data outperformed rectangular coordinate data, encouraging more research into the most appropriate time series for postural stability entropy analysis.

Keywords

Entropy RQA Fallers Elderly Sample entropy Multiscale entropy Approximate entropy Composite multiscale entropy 

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Copyright information

© Biomedical Engineering Society 2015

Authors and Affiliations

  • Peter C. Fino
    • 1
  • Ahmad R. Mojdehi
    • 2
  • Khaled Adjerid
    • 2
  • Mohammad Habibi
    • 2
  • Thurmon E. Lockhart
    • 3
  • Shane D. Ross
    • 2
  1. 1.Department of Mechanical EngineeringVirginia Polytechnic Institute and State UniversityBlacksburgUSA
  2. 2.Department of Biomedical Engineering and MechanicsVirginia Polytechnic Institute and State UniversityBlacksburgUSA
  3. 3.School of Biological and Health Systems Engineering, Ira A. Fulton Schools of EngineeringArizona State UniversityTempeUSA

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