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Postural stability when walking and exposed to mediolateral oscillatory motion: Effect of oscillation waveform

Postural stability when walking and exposed to mediolateral oscillatory motion: Effect of oscillation waveform
Postural stability when walking and exposed to mediolateral oscillatory motion: Effect of oscillation waveform

Postural stability can be threatened by the low-frequency motions in transport that are usually quantified by their root-mean-square (r.m.s.) acceleration. This study investigated how the stability of walking people depends on the waveform of 1- and 2-Hz mediolateral oscillations of the surface on which they walk. Walking on a treadmill, 20 subjects were perturbed by random oscillations of the treadmill with one-third octave bandwidths: different waveforms with the same r.m.s. acceleration and different waveforms with the same peak acceleration. Stability was measured subjectively and objectively by the velocity of the center of pressure in the mediolateral direction. Subjective and objective measures of walking instability increased with increasing r.m.s. acceleration of oscillations having the same peak acceleration. These same measures of instability were also affected by the peak acceleration when the r.m.s. magnitude of the oscillations was constant, especially with 1-Hz oscillations. It is concluded that r.m.s. measures of acceleration are insufficient to predict the postural stability of walking passengers exposed to mediolateral oscillations and that peaks in the oscillations should also be taken into account.

mediolateral surface oscillation, motion waveform, perturbed locomotion, vibration
1065-8483
131-139
Ayık, Hatice Mujde
f80c78f6-8cd4-4c95-b8a0-bad826e20065
Griffin, Michael J.
24112494-9774-40cb-91b7-5b4afe3c41b8
Ayık, Hatice Mujde
f80c78f6-8cd4-4c95-b8a0-bad826e20065
Griffin, Michael J.
24112494-9774-40cb-91b7-5b4afe3c41b8

Ayık, Hatice Mujde and Griffin, Michael J. (2019) Postural stability when walking and exposed to mediolateral oscillatory motion: Effect of oscillation waveform. Journal of Applied Biomechanics, 35 (2), 131-139. (doi:10.1123/jab.2017-0352).

Record type: Article

Abstract

Postural stability can be threatened by the low-frequency motions in transport that are usually quantified by their root-mean-square (r.m.s.) acceleration. This study investigated how the stability of walking people depends on the waveform of 1- and 2-Hz mediolateral oscillations of the surface on which they walk. Walking on a treadmill, 20 subjects were perturbed by random oscillations of the treadmill with one-third octave bandwidths: different waveforms with the same r.m.s. acceleration and different waveforms with the same peak acceleration. Stability was measured subjectively and objectively by the velocity of the center of pressure in the mediolateral direction. Subjective and objective measures of walking instability increased with increasing r.m.s. acceleration of oscillations having the same peak acceleration. These same measures of instability were also affected by the peak acceleration when the r.m.s. magnitude of the oscillations was constant, especially with 1-Hz oscillations. It is concluded that r.m.s. measures of acceleration are insufficient to predict the postural stability of walking passengers exposed to mediolateral oscillations and that peaks in the oscillations should also be taken into account.

Text
14826 HMA-MJG 2019 - Journal of Applied Biomechanics - Accepted Manuscript
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More information

e-pub ahead of print date: 30 January 2019
Published date: 1 April 2019
Keywords: mediolateral surface oscillation, motion waveform, perturbed locomotion, vibration

Identifiers

Local EPrints ID: 430043
URI: https://eprints.soton.ac.uk/id/eprint/430043
ISSN: 1065-8483
PURE UUID: 43ace8f8-ba52-4a03-8d36-b4753c7f82dc
ORCID for Michael J. Griffin: ORCID iD orcid.org/0000-0003-0743-9502

Catalogue record

Date deposited: 10 Apr 2019 16:30
Last modified: 20 Jul 2019 01:27

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