alexa Dynamic stability of a human standing on a balance board.
Mathematics

Mathematics

Journal of Biometrics & Biostatistics

Author(s): Chagdes JR, Rietdyk S, Jeffrey MH, Howard NZ, Raman A

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Abstract The neuromuscular system used to stabilize upright posture in humans is a nonlinear dynamical system with time delays. The analysis of this system is important for improving balance and for early diagnosis of neuromuscular disease. In this work, we study the dynamic coupling between the neuromuscular system and a balance board-an unstable platform often used to improve balance in young athletes, and older or neurologically impaired patients. Using a simple inverted pendulum model of human posture on a balance board, we describe a surprisingly broad range of divergent and oscillatory CoP/CoM responses associated with instabilities of the upright equilibrium. The analysis predicts that a variety of sudden changes in the stability of upright postural equilibrium occurs with slow continuous deterioration in balance board stiffness, neuromuscular gain, and time delay associated with the changes in proprioceptive/vestibular/visual-neuromuscular feedback. The analysis also provides deeper insight into changes in the control of posture that enable stable upright posture on otherwise unstable platforms. © 2013 Elsevier Ltd. All rights reserved. This article was published in J Biomech and referenced in Journal of Biometrics & Biostatistics

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