This paper reports on the dynamic analysis and experimental validation of a method to perturb the balance of subjects in quiet standing. Electronically released weights pull the subject's waist through a specified displacement sensed by a photoelectric sensor. A dynamic model is derived that computes the force applied to the subject as a function of waist acceleration. This model accurately predicts the acceleration of mock subjects (suspended masses) with high repeatability. The validity and simplicity of this model suggest that this method can provide a standard for provocation testing on stable surfaces. Proof-of-concept trials on human subjects demonstrate that the device can be used with a force platform and motion tracking and that the device can induce both sway and step recoveries in healthy male adults.
Biomechanical Analysis of a Dynamic Stability Test System to Evoke Sway and Step Recovery
Manuscript received June 30, 2014; final manuscript received July 30, 2015; published online August 31, 2015. Assoc. Editor: Paul Rullkoetter.
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Gildenhuys, A., Zandiyeh, P., Kuntze, G., Goldsmith, P., and Ronsky, J. L. (August 31, 2015). "Biomechanical Analysis of a Dynamic Stability Test System to Evoke Sway and Step Recovery." ASME. J Biomech Eng. October 2015; 137(10): 104501. https://doi.org/10.1115/1.4031329
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