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Evaluation of the postural stability of elderly persons using time domain signal analysis.

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Authors
Rasku, Jyrki
Pyykkö, Ilmari
Juhola, Martti
Garcia, Melissa
Harris, Tamara
Launer, Lenore
Eiriksdottir, Gudny
Siggeirsdottir, Kristin
Jonsson, Palmi
Hoffman, Howard J
Petersen, Hannes
Rasmussen, Cuno
Caserotti, Paolo
Toppila, Esko
Pajala, Satu
Gudnason, Vilmundur
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Issue Date
2012

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Citation
J Vestib Res 2012, 22(5-6):243-52
Abstract
A force platform is widely used in the evaluation of postural stability in man. Although an abundance of parameters are typically retrieved from force platform data, no uniform analysis of the data has been carried out. In general, the signal analysis does not analyze the underlying postural event, i.e., whether the signal consists of several small corrections or large excursions. In the present work, we studied the postural stability of 4589 elderly persons from Iceland on a force platform under visual and non-visual conditions during stance on a solid surface. We analyzed the internal relationship between frequently used time domain variables. In addition, we conducted a factor analysis using a subset of selected variables. Factor analysis yielded three components that can be considered different strategies for maintaining posture. In one control strategy, long swaying amplitues were pronounced, allowing the person to react when postural confidence limits are reached. In a second strategy, a high oscillation rate about the stationary point was the dominant characteristic of maintaining postural control. The third strategy appears to involve a short critical time period during which an open loop control changes into a closed loop that very rapidly controls excessive postural oscillations. The findings suggest that conventional parameters such as swaying velocity and amplitude alone do not provide sufficient information regarding a person's ability to maintain an upright stance.
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http://dx.doi.org/10.3233/VES-120465
http://web.ebscohost.com/ehost/pdfviewer/pdfviewer?sid=4d3a9c41-dd29-41a4-843c-72eb1492f835%40sessionmgr110&vid=2&hid=127
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Archived with thanks to Journal of vestibular research : equilibrium & orientation
ae974a485f413a2113503eed53cd6c53
10.3233/VES-120465
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English Journal Articles (Peer Reviewed)

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