Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/25108
Title: Reduction of lower limb model indeterminacy by force redundancy in sit-to-stand motion
Authors: Mak, MKY 
Levin, O
Mizrahi, J
Hui-Chan, CWY
Keywords: Chair-rise
Inverse dynamics
Joint torques
Lower extremities
Model uncertainties
Issue Date: 2004
Publisher: Human Kinetics Publ Inc
Source: Journal of applied biomechanics, 2004, v. 20, no. 1, p. 95-102 How to cite?
Journal: Journal of Applied Biomechanics 
Abstract: Calculation of joint torques during the rising phase of sit-to-stand motion is in most cases indeterminate, due to the unknown thighs/chair reaction forces in addition to the other sources of uncertainties such as joint positioning and anthropometric data. In the present study we tested the reliability of computation of the joint torques from a five-segment model; we used force plate data of thighs/chair and feet/ground reaction forces, in addition to kinematic measurements. While solving for joint torques before and after seat-off, differences between model solutions and measured data were calculated and minimized using an iterative algorithm for the reestimation of joint positioning and anthropometric properties. The above method was demonstrated for a group of six normal elderly persons.
URI: http://hdl.handle.net/10397/25108
ISSN: 1065-8483
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