@article{ref1,
title="Model-based assessments of the effects of age and ankle fatigue on the control of upright posture in humans",
journal="Gait and posture",
year="2009",
author="Qu, Xiaobo and Nussbaum, Maury A. and Madigan, Michael L.",
volume="30",
number="4",
pages="518-522",
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 plantar-flexor 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.<p /><p>Language: en</p>",
language="en",
issn="0966-6362",
doi="10.1016/j.gaitpost.2009.07.127",
url="http://dx.doi.org/10.1016/j.gaitpost.2009.07.127"
}