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Model-based assessments of the effects of age and ankle fatigue on the control of upright posture in humans.

Authors
Qu-X; Nussbaum-MA; Madigan-ML
Source
Gait Posture 2009 Nov; 30(4):518-522
NIOSHTIC No.
20036322
Abstract
The aim of this study was to investigate how and why age and localized muscle fatigue affect postural control using model-based simulations. A balance control model, based on an optimal control strategy, was used to simulate trials of quiet upright stance both pre-fatigue and following induced ankle plantarflexor fatigue. Empirical data were obtained from an earlier study that included both younger and older participants. Effects of age and ankle fatigue were determined from center-of-pressure (COP) measures and fitted model parameters. Though some discrepancies existed, the simulated effects of age and ankle fatigue were consistent with experimental findings in terms of trends in COP-based measures with age and ankle fatigue. Changes in both COP-based measures and model parameters were used to infer potential underlying causal mechanisms for the observed effects of age and ankle fatigue. For example, the model-based simulations indicated that sensory delay time increased with age and ankle fatigue by 31.1% and 2.9%, respectively, suggesting a potentially important role for such delay in postural control and fall risks.
Keywords
Age-factors; Age-groups; Biomechanical-modeling; Biomechanics; Ergonomics; Fatigue; Fatigue-properties; Motion-studies; Muscle-physiology; Muscles; Muscle-stress; Musculoskeletal-system; Musculoskeletal-system-disorders; Physical-capacity; Physical-reactions; Physical-stress; Physiology; Posture; Statistical-analysis; Author Keywords: Balance; Postural control; Age; Ankle fatigue; Model-based simulation
Contact
Xingda Qu, School of Mechanical and Aerospace Engineering, Nanyang Technological University, Blk N3, North Spine, Nanyang Avenue, Singapore 639798
Publication Date
20091101
Document Type
Journal Article
Email Address
xdqu@ntu.edu.sg
Funding Type
Grant
Fiscal Year
2010
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-007882
Issue of Publication
4
ISSN
0966-6362
Source Name
Gait and Posture
State
VA
Performing Organization
Virginia Polytechnic Institute and State University
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