title: Computational method to evaluate ankle postural stiffness with ground reaction forces.
abstract: We examined an existing method for evaluating postural sway based on force-plate technology. Through an improved mathematical model of postural dynamics, we propose a new method, which better evaluated postural sway and, in addition, computed ankle moment and ankle postural stiffness directly from the measured ground reaction forces. An example is detailed that demonstrates the utility of this approach. The proposed method does not involve filtering or numerical integration and considers the platform inclination. Results from normal subjects show a linear relation between the ankle moment and the sway angle during quiet standing.
authors.affiliation: Department of Mechanical Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA. ji@njit.edu
authors.forename: Zhiming
authors.initials: Z
authors.lastname: Ji
authors.forename: Thomas
authors.initials: T
authors.lastname: Findley
authors.forename: Hans
authors.initials: H
authors.lastname: Chaudhry
authors.forename: Bruce
authors.initials: B
authors.lastname: Bukiet
mesh_terms: D000328:Adult; D000368:Aged; D000842:Ankle / Q000502:physiology*; D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008962:Models, Theoretical; D011187:Posture