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Selection of entropy-measure parameters for force plate-based human balance evaluation
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Montesinos-Silva, Luis, Castaldo, Rossana and Pecchia, Leandro (2018) Selection of entropy-measure parameters for force plate-based human balance evaluation. In: World Congress on Medical Physics and Biomedical Engineering 2018, Prague, Czech Republic, 3-8 June 2018. Published in: IFMBE Proceedings, 68/2 pp. 315-319. ISBN 9789811090387. doi:10.1007/978-981-10-9038-7_59 ISSN 1680-0737.
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Official URL: http://dx.doi.org/10.1007/978-981-10-9038-7_59
Abstract
Human balance is commonly evaluated through the center of pressure (COP) displacement measured with a force plate, producing 2D time-series that represent COP trajectories in the anteroposterior and mediolateral directions. Entropy measures have been previously used to quantify the regularity of those time-series in different groups and/or experimental conditions. However, these measures are computed using multiple input parameters, the selection of which has been scarcely investigated within this context. This study aimed to investigate the behavior of COP time-series entropy measures using different parameters values, in order to inform their selection. Specifically, we investigated Approximate Entropy (ApEn) and Sample Entropy (SampEn), which are very sensitive to their input parameters: m (embedding dimension), r (tolerance) and N (length of data). A dataset containing COP time-series for 159 subjects with no physical disabilities was used. As a case study, subjects were grouped in young adults (age < 60, n = 85), and older adults (age ≥ 60) with (n = 18) and without (n = 56) history of falls. ApEn and SampEn were computed for m = {2, 3} and r = {0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5} with a fixed data length (N = 1200 points). ApEn and SampEn values were compared between groups using one-way ANOVA. Our results suggest that ApEn and SampEn are able to discriminate with ease between young and older adults for a wide range of m and r values. However, the selection becomes critical for the discrimination between non-fallers and fallers. An m = 2 and r = {0.4, 0.45} are suggested in this case.
Item Type: | Conference Item (Paper) | |||||||||
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Subjects: | Q Science > QP Physiology | |||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | |||||||||
Library of Congress Subject Headings (LCSH): | Equilibrium (Physiology) -- Measurement, Biomedical engineering, Entropy | |||||||||
Journal or Publication Title: | IFMBE Proceedings | |||||||||
Publisher: | International Federation for Medical and Biological Engineering | |||||||||
ISBN: | 9789811090387 | |||||||||
ISSN: | 1680-0737 | |||||||||
Book Title: | World Congress on Medical Physics and Biomedical Engineering 2018 | |||||||||
Editor: | Lhotska, L. and Sukupova, L. and Lacković, I. and Ibbott, G. | |||||||||
Official Date: | 30 May 2018 | |||||||||
Dates: |
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Volume: | 68/2 | |||||||||
Page Range: | pp. 315-319 | |||||||||
DOI: | 10.1007/978-981-10-9038-7_59 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||
Date of first compliant deposit: | 3 August 2018 | |||||||||
Date of first compliant Open Access: | 30 May 2019 | |||||||||
RIOXX Funder/Project Grant: |
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Conference Paper Type: | Paper | |||||||||
Title of Event: | World Congress on Medical Physics and Biomedical Engineering 2018 | |||||||||
Type of Event: | Conference | |||||||||
Location of Event: | Prague, Czech Republic | |||||||||
Date(s) of Event: | 3-8 June 2018 | |||||||||
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