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A balance control model of quiet upright stance based on an optimal control strategy.

Authors
Qu-X; Nussbaum-MA; Madigan-ML
Source
J Biomech 2007 Jun; 40(16):3590-3597
NIOSHTIC No.
20033208
Abstract
Models of balance control can aid in understanding the mechanisms by which humans maintain balance. A balance control model of quiet upright stance based on an optimal control strategy is presented here. In this model, the human body was represented by a simple single-segment inverted pendulum during upright stance, and the neural controller was assumed to be an optimal controller that generates ankle control torques according to a certain performance criterion. This performance criterion was defined by several physical quantities relevant to sway. In order to accurately simulate existing experimental data, an optimization procedure was used to specify the set of model parameters to minimize the scalar error between experimental and simulated sway measures. Thirty-two independent simulations were performed for both younger and older adults. The model's capabilities, in terms of reflecting sway behaviors and identifying aging effects, were then analyzed based on the simulation results. The model was able to accurately predict center-of-pressure-based sway measures, and identify potential changes in balance control mechanisms caused by aging. Correlations between sway measures and model parameters are also discussed.
Keywords
Ergonomics; Musculoskeletal-system; Muscles; Muscle-tension; Age-factors; Electrophysiological-measurements; Inner-ear; Mathematical-models; Statistical-analysis
Contact
Maury A. Nussbaum, Department of Industrial and Systems Engineering, School of Biomedical Engineering and Sciences, Virginia Tech, 250 Durham Hall (0118), Blacksburg, VA 24061
CODEN
JBMCB5
Publication Date
20070601
Document Type
Journal Article
Funding Type
Grant
Fiscal Year
2007
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-004089
Issue of Publication
16
ISSN
0021-9290
Source Name
Journal of Biomechanics
State
VA
Performing Organization
Virginia Polytechnic Institute and State University
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