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Feature extraction and selection for objective gait analysis and fall risk assessment by accelerometry
BACKGROUND: Falls in the elderly is nowadays a major concern because of their consequences on elderly general health and moral states. Moreover, the aging of the population and the increasing life expectancy make the prediction of falls more and more important. The analysis presented in this article...
Autores principales: | , , , , |
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Formato: | Texto |
Lenguaje: | English |
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BioMed Central
2011
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3022766/ https://www.ncbi.nlm.nih.gov/pubmed/21244718 http://dx.doi.org/10.1186/1475-925X-10-1 |
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author | Caby, Benoit Kieffer, Suzanne de Saint Hubert, Marie Cremer, Gerald Macq, Benoit |
author_facet | Caby, Benoit Kieffer, Suzanne de Saint Hubert, Marie Cremer, Gerald Macq, Benoit |
author_sort | Caby, Benoit |
collection | PubMed |
description | BACKGROUND: Falls in the elderly is nowadays a major concern because of their consequences on elderly general health and moral states. Moreover, the aging of the population and the increasing life expectancy make the prediction of falls more and more important. The analysis presented in this article makes a first step in this direction providing a way to analyze gait and classify hospitalized elderly fallers and non-faller. This tool, based on an accelerometer network and signal processing, gives objective informations about the gait and does not need any special gait laboratory as optical analysis do. The tool is also simple to use by a non expert and can therefore be widely used on a large set of patients. METHOD: A population of 20 hospitalized elderlies was asked to execute several classical clinical tests evaluating their risk of falling. They were also asked if they experienced any fall in the last 12 months. The accelerations of the limbs were recorded during the clinical tests with an accelerometer network distributed on the body. A total of 67 features were extracted from the accelerometric signal recorded during a simple 25 m walking test at comfort speed. A feature selection algorithm was used to select those able to classify subjects at risk and not at risk for several classification algorithms types. RESULTS: The results showed that several classification algorithms were able to discriminate people from the two groups of interest: fallers and non-fallers hospitalized elderlies. The classification performances of the used algorithms were compared. Moreover a subset of the 67 features was considered to be significantly different between the two groups using a t-test. CONCLUSIONS: This study gives a method to classify a population of hospitalized elderlies in two groups: at risk of falling or not at risk based on accelerometric data. This is a first step to design a risk of falling assessment system that could be used to provide the right treatment as soon as possible before the fall and its consequences. This tool could also be used to evaluate the risk several times during the revalidation procedure. |
format | Text |
id | pubmed-3022766 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2011 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-30227662011-01-20 Feature extraction and selection for objective gait analysis and fall risk assessment by accelerometry Caby, Benoit Kieffer, Suzanne de Saint Hubert, Marie Cremer, Gerald Macq, Benoit Biomed Eng Online Research BACKGROUND: Falls in the elderly is nowadays a major concern because of their consequences on elderly general health and moral states. Moreover, the aging of the population and the increasing life expectancy make the prediction of falls more and more important. The analysis presented in this article makes a first step in this direction providing a way to analyze gait and classify hospitalized elderly fallers and non-faller. This tool, based on an accelerometer network and signal processing, gives objective informations about the gait and does not need any special gait laboratory as optical analysis do. The tool is also simple to use by a non expert and can therefore be widely used on a large set of patients. METHOD: A population of 20 hospitalized elderlies was asked to execute several classical clinical tests evaluating their risk of falling. They were also asked if they experienced any fall in the last 12 months. The accelerations of the limbs were recorded during the clinical tests with an accelerometer network distributed on the body. A total of 67 features were extracted from the accelerometric signal recorded during a simple 25 m walking test at comfort speed. A feature selection algorithm was used to select those able to classify subjects at risk and not at risk for several classification algorithms types. RESULTS: The results showed that several classification algorithms were able to discriminate people from the two groups of interest: fallers and non-fallers hospitalized elderlies. The classification performances of the used algorithms were compared. Moreover a subset of the 67 features was considered to be significantly different between the two groups using a t-test. CONCLUSIONS: This study gives a method to classify a population of hospitalized elderlies in two groups: at risk of falling or not at risk based on accelerometric data. This is a first step to design a risk of falling assessment system that could be used to provide the right treatment as soon as possible before the fall and its consequences. This tool could also be used to evaluate the risk several times during the revalidation procedure. BioMed Central 2011-01-09 /pmc/articles/PMC3022766/ /pubmed/21244718 http://dx.doi.org/10.1186/1475-925X-10-1 Text en Copyright ©2011 Caby et al; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Caby, Benoit Kieffer, Suzanne de Saint Hubert, Marie Cremer, Gerald Macq, Benoit Feature extraction and selection for objective gait analysis and fall risk assessment by accelerometry |
title | Feature extraction and selection for objective gait analysis and fall risk assessment by accelerometry |
title_full | Feature extraction and selection for objective gait analysis and fall risk assessment by accelerometry |
title_fullStr | Feature extraction and selection for objective gait analysis and fall risk assessment by accelerometry |
title_full_unstemmed | Feature extraction and selection for objective gait analysis and fall risk assessment by accelerometry |
title_short | Feature extraction and selection for objective gait analysis and fall risk assessment by accelerometry |
title_sort | feature extraction and selection for objective gait analysis and fall risk assessment by accelerometry |
topic | Research |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3022766/ https://www.ncbi.nlm.nih.gov/pubmed/21244718 http://dx.doi.org/10.1186/1475-925X-10-1 |
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