Publikation: The role of torque feedback in standing balance
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It has been proposed that sensory force/pressure cues are integrated within a positive feedback mechanism, which accounts for the slow dynamics of human standing behaviour and helps align the body with gravity. However, experimental evidence of this mechanism remains scarce. This study tested predictions of a positive torque feedback mechanism for standing balance, specifically that differences between a "reference" torque and actual torque are self-amplified, causing the system to generate additional torque. Seventeen healthy young adults were positioned in an apparatus that permitted normal sway at the ankle until a brake on the apparatus was applied, discreetly 'locking' body movement during stance. Once locked, a platform positioned under the apparatus remained in place (0mm) or slowly translated backwards (3mm or 6mm), tilting subjects forward. Postural behaviour was characterized by two distinct responses: the centre of pressure (COP) offset (i.e., change in COP elicited by the surface translation) and the COP drift (i.e., change in COP during the sustained tilt). Model simulations were performed using a linear balance control model containing torque feedback to provide a conceptual basis for the interpretation of experimental results. Holding the body in sustained tilt positions resulted in COP drifting behaviour, reflecting attempts of the balance control system to restore an upright position through increases in plantar flexor torque. In line with predictions of positive torque feedback, larger COP offsets led to faster increases in COP over time. These findings provide experimental support for a positive torque feedback mechanism involved in the control of standing balance.
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MISSEN, Kyle J., Lorenz ASSLÄNDER, Alison D. BABICHUK, Romeo CHUA, J. Timothy INGLIS, Mark G. CARPENTER, 2023. The role of torque feedback in standing balance. In: Journal of Neurophysiology. American Physiological Society. 2023, 130, pp. 585-595. ISSN 0022-3077. eISSN 1522-1598. Available under: doi: 10.1152/jn.00046.2023BibTex
@article{Missen2023-07-26torqu-67477, year={2023}, doi={10.1152/jn.00046.2023}, title={The role of torque feedback in standing balance}, volume={130}, issn={0022-3077}, journal={Journal of Neurophysiology}, pages={585--595}, author={Missen, Kyle J. and Assländer, Lorenz and Babichuk, Alison D. and Chua, Romeo and Inglis, J. Timothy and Carpenter, Mark G.} }
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