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Gait Measurement System for the Multi-Target Stepping Task Using a Laser Range Sensor

For the prevention of falling in the elderly, gait training has been proposed using tasks such as the multi-target stepping task (MTST), in which participants step on assigned colored targets. This study presents a gait measurement system using a laser range sensor for the MTST to evaluate the risk...

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Autores principales: Yorozu, Ayanori, Nishiguchi, Shu, Yamada, Minoru, Aoyama, Tomoki, Moriguchi, Toshiki, Takahashi, Masaki
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4482006/
https://www.ncbi.nlm.nih.gov/pubmed/25985161
http://dx.doi.org/10.3390/s150511151
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author Yorozu, Ayanori
Nishiguchi, Shu
Yamada, Minoru
Aoyama, Tomoki
Moriguchi, Toshiki
Takahashi, Masaki
author_facet Yorozu, Ayanori
Nishiguchi, Shu
Yamada, Minoru
Aoyama, Tomoki
Moriguchi, Toshiki
Takahashi, Masaki
author_sort Yorozu, Ayanori
collection PubMed
description For the prevention of falling in the elderly, gait training has been proposed using tasks such as the multi-target stepping task (MTST), in which participants step on assigned colored targets. This study presents a gait measurement system using a laser range sensor for the MTST to evaluate the risk of falling. The system tracks both legs and measures general walking parameters such as stride length and walking speed. Additionally, it judges whether the participant steps on the assigned colored targets and detects cross steps to evaluate cognitive function. However, situations in which one leg is hidden from the sensor or the legs are close occur and are likely to lead to losing track of the legs or false tracking. To solve these problems, we propose a novel leg detection method with five observed leg patterns and global nearest neighbor-based data association with a variable validation region based on the state of each leg. In addition, methods to judge target steps and detect cross steps based on leg trajectory are proposed. From the experimental results with the elderly, it is confirmed that the proposed system can improve leg-tracking performance, judge target steps and detect cross steps with high accuracy.
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spelling pubmed-44820062015-06-29 Gait Measurement System for the Multi-Target Stepping Task Using a Laser Range Sensor Yorozu, Ayanori Nishiguchi, Shu Yamada, Minoru Aoyama, Tomoki Moriguchi, Toshiki Takahashi, Masaki Sensors (Basel) Article For the prevention of falling in the elderly, gait training has been proposed using tasks such as the multi-target stepping task (MTST), in which participants step on assigned colored targets. This study presents a gait measurement system using a laser range sensor for the MTST to evaluate the risk of falling. The system tracks both legs and measures general walking parameters such as stride length and walking speed. Additionally, it judges whether the participant steps on the assigned colored targets and detects cross steps to evaluate cognitive function. However, situations in which one leg is hidden from the sensor or the legs are close occur and are likely to lead to losing track of the legs or false tracking. To solve these problems, we propose a novel leg detection method with five observed leg patterns and global nearest neighbor-based data association with a variable validation region based on the state of each leg. In addition, methods to judge target steps and detect cross steps based on leg trajectory are proposed. From the experimental results with the elderly, it is confirmed that the proposed system can improve leg-tracking performance, judge target steps and detect cross steps with high accuracy. MDPI 2015-05-13 /pmc/articles/PMC4482006/ /pubmed/25985161 http://dx.doi.org/10.3390/s150511151 Text en © 2015 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Yorozu, Ayanori
Nishiguchi, Shu
Yamada, Minoru
Aoyama, Tomoki
Moriguchi, Toshiki
Takahashi, Masaki
Gait Measurement System for the Multi-Target Stepping Task Using a Laser Range Sensor
title Gait Measurement System for the Multi-Target Stepping Task Using a Laser Range Sensor
title_full Gait Measurement System for the Multi-Target Stepping Task Using a Laser Range Sensor
title_fullStr Gait Measurement System for the Multi-Target Stepping Task Using a Laser Range Sensor
title_full_unstemmed Gait Measurement System for the Multi-Target Stepping Task Using a Laser Range Sensor
title_short Gait Measurement System for the Multi-Target Stepping Task Using a Laser Range Sensor
title_sort gait measurement system for the multi-target stepping task using a laser range sensor
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4482006/
https://www.ncbi.nlm.nih.gov/pubmed/25985161
http://dx.doi.org/10.3390/s150511151
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