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A quantitative analysis of pendular motion of the lower leg in spastic human subjects | IEEE Journals & Magazine | IEEE Xplore

A quantitative analysis of pendular motion of the lower leg in spastic human subjects


Abstract:

Gravity-induced oscillations of the lower leg in normal and spastic subjects were examined with a view towards evaluating a clinical test of spasticity called the pendulu...Show More

Abstract:

Gravity-induced oscillations of the lower leg in normal and spastic subjects were examined with a view towards evaluating a clinical test of spasticity called the pendulum test. For passive limb motion (in which no reflex excitation occurred), a second-order linear model did not provide an adequate description of the motion for either spastic or normal legs. System equations including nonlinear mechanical properties simulating asymmetries in the swing and amplitude dependent variations in stiffness and damping provided a more accurate description. For spastic limb motion (in which reflex excitation did occur) accurate simulation required components accounting for abnormal reflex activation, coinciding with the time course of EMG activation. These included increased stiffness and damping with their gains related to reflex EMG magnitude, and changes in the rest length of the stiffness. Comparison of numerical with experimental data showed that the nonlinear model simulated the motion accurately, with the variance accounted for usually exceeding 90%.<>
Published in: IEEE Transactions on Biomedical Engineering ( Volume: 38, Issue: 9, September 1991)
Page(s): 906 - 918
Date of Publication: 06 August 2002

ISSN Information:

PubMed ID: 1743739

References

References is not available for this document.