By Topic

Evaluation and treatment of spastic hypertonia and contracture

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

7 Author(s)
Li-Qun Zhang ; Rehabilitation Inst. of Chicago, IL, USA ; Chung, S.G. ; van Rey, E.M. ; Lin, A.F.
more authors

Spastic hypertonia has reflex/non-reflex and dynamic/static components, which were investigated in ankles of 24 spastic hemiparetic and 32 normal subjects. Furthermore, the spastic ankles were treated with an intelligent stretching device with outcome evaluated in terms of phasic and tonic stretch-reflex gains, reflex threshold, joint elastic stiffness, and viscous damping. We found that joint elastic stiffness was increased in spastic ankles, especially in the plantar flexors. The increase was due to an increase in passive stiffness instead of intrinsic stiffness. Viscous damping was increased in spastic plantar flexors. Reflexively, spastic ankles showed higher dynamic reflex gain in spastic plantar flexors, indicating exaggerated phasic stretch reflex. The static stretch-reflex gain was increased in spastic ankles, indicating hyperactive tonic stretch reflex, and spastic muscles did not regulate tonic stretch reflex as controls did. Reflex hyperexcitability in spasticity was associated with both increased tendon reflex gain and decreased threshold. After stretching, the patients were able to generate higher plantar flexion MVC torque, which was corroborated by increased torques induced by matched electrical stimulation of the spastic muscles. They were also able to move in large ROM. Achilles tendon properties evaluated by ultrasonography corroborated the strength increase.

Published in:

Engineering in Medicine and Biology, 2002. 24th Annual Conference and the Annual Fall Meeting of the Biomedical Engineering Society EMBS/BMES Conference, 2002. Proceedings of the Second Joint  (Volume:3 )

Date of Conference:

23-26 Oct. 2002