2024-03-29T06:36:56Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00024628
2023-01-16T04:30:21Z
1213:1362:1363
Effects of the lateral amplitude and regularity of upper body fluctuation on step time variability evaluated using return map analysis
Chidori, Kazuhiro
Yamamoto, Yuji
open access
© 2017 Chidori, Yamamoto. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
The aim of this study was to evaluate the effects of the lateral amplitude and regularity of upper body fluctuation on step time variability. Return map analysis was used to clarify the relationship between step time variability and a history of falling. Eleven healthy, community-dwelling older adults and twelve younger adults participated in the study. All of the subjects walked 25 m at a comfortable speed. Trunk acceleration was measured using triaxial accelerometers attached to the third lumbar vertebrae (L3) and the seventh cervical vertebrae (C7). The normalized average magnitude of acceleration, the coefficient of determination ($R^2$) of the return map, and the step time variabilities, were calculated. Cluster analysis using the average fluctuation and the regularity of C7 fluctuation identified four walking patterns in the mediolateral (ML) direction. The participants with higher fluctuation and lower regularity showed significantly greater step time variability compared with the others. Additionally, elderly participants who had fallen in the past year had higher amplitude and a lower regularity of fluctuation during walking. In conclusion, by focusing on the time evolution of each step, it is possible to understand the cause of stride and/or step time variability that is associated with a risk of falls.
PLOS
2017-07-10
eng
journal article
VoR
http://hdl.handle.net/2237/26847
https://nagoya.repo.nii.ac.jp/records/24628
https://doi.org/10.1371/journal.pone.0180898
1932-6203
PLoS ONE
12
7
e0180898
e0180898
https://nagoya.repo.nii.ac.jp/record/24628/files/journal_pone_0180898.pdf
application/pdf
599.9 kB
2018-02-22