DocumentCode :
2196207
Title :
Increased reflex contributions to dynamic ankle stiffness in spastic spinal cord injured patients
Author :
Mirbagheri, M.M. ; Kearney, R.E. ; Barbeau, H. ; Ladouceur, M.
Author_Institution :
Dept. of Biomed. Eng., McGill Univ., Montreal, Que., Canada
Volume :
2
fYear :
1996
fDate :
31 Oct-3 Nov 1996
Firstpage :
607
Abstract :
A parallel-cascade system identification method was used to identify intrinsic and reflex contributions to dynamic ankle stiffness at different positions from plantarflexion in both normal subjects and spastic spinal cord injured (SCI) persons with an incomplete motor function loss. Intrinsic stiffness was well modeled by a linear second-order system between ankle position and torque. Reflex stiffness dynamics were accurately described by a linear third-order system between half-rectified velocity and reflex torque. Intrinsic stiffness increased with ankle dorsiflexion in both normal and SCI subjects and no significant change was found between the two groups. Reflex stiffness also increased in both normal and SCI subjects with ankle dorsiflexion, however, it was significantly higher in patients than in normal subjects at all positions
Keywords :
biomechanics; elasticity; electromyography; identification; linear systems; neurophysiology; physiological models; torque; EMG; ankle dorsiflexion; ankle position; ankle torque; dynamic ankle stiffness; incomplete motor function loss; increased reflex contributions; intrinsic contributions; linear second-order system; linear third-order system; nonlinear least squares methods; parallel-cascade system identification method; plantarflexion; spastic spinal cord injured patients; stiffness gain; Actuators; Biomedical engineering; Foot; Medical treatment; Nonlinear dynamical systems; Parametric statistics; Protocols; Spinal cord; System identification; Torque;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Engineering in Medicine and Biology Society, 1996. Bridging Disciplines for Biomedicine. Proceedings of the 18th Annual International Conference of the IEEE
Conference_Location :
Amsterdam
Print_ISBN :
0-7803-3811-1
Type :
conf
DOI :
10.1109/IEMBS.1996.651887
Filename :
651887
Link To Document :
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