TY - JOUR
T1 - Time-course analysis of stretch reflexes in hemiparetic subjects using an on-line spasticity measurement system
AU - Ju, Ming Shaung
AU - Chen, Jia Jin J.
AU - Lee, Hsin Min
AU - Lin, Thy Sheng
AU - Lin, Chou Ching
AU - Huang, Yin Zu
N1 - Funding Information:
The authors would like to thank the National Science Council of the R.O.C. for financially supporting the work under Contract No. NSC87–2314–B–006–125–M08, NSC86–2314–B–006–108–M08, NSC85–2331–B–006–080–M08, NSC 84–2331–B006–054–M08.
Copyright:
Copyright 2007 Elsevier B.V., All rights reserved.
PY - 2000/2
Y1 - 2000/2
N2 - Spasticity after a stroke is usually assessed in a score form by subjectively determining the resistance of a joint to an externally imposed passive movement. This work presents a spasticity measurement system for on-line quantifying the stretch reflex of paretic limbs. Four different constant stretch velocities in a ramp-and-hold mode are used to elicit the stretch reflex of the elbow joint in spastic subjects. The subjects are tested at supine position with the upper limb stretched towards the ground, in contrast with the horizontally stretched movement used in other studies. By subtracting the baseline torque, reflex torque measured at a selected low stretch velocity of 5 deg/sec, the influence of gravity torque and inertial in vertical stretching mode can be minimized. The averaged speed-dependent reflex torque (ASRT), defined as the measured torque deviated from the baseline torque, is used for quantifying the spastic hypertonia. Four subjects having incurred cerebrovascular accident (CVA) are recruited for time-course study in which the measurements are taken at 72 hours, one week, one month, three months, and six months after onset of stroke. During the development of spasticity, the changes of ASRT and velocity sensitivity of ASRT of the involved and the intact elbow joints are discussed. Copyright (C) 2000 Elsevier Science Ltd.
AB - Spasticity after a stroke is usually assessed in a score form by subjectively determining the resistance of a joint to an externally imposed passive movement. This work presents a spasticity measurement system for on-line quantifying the stretch reflex of paretic limbs. Four different constant stretch velocities in a ramp-and-hold mode are used to elicit the stretch reflex of the elbow joint in spastic subjects. The subjects are tested at supine position with the upper limb stretched towards the ground, in contrast with the horizontally stretched movement used in other studies. By subtracting the baseline torque, reflex torque measured at a selected low stretch velocity of 5 deg/sec, the influence of gravity torque and inertial in vertical stretching mode can be minimized. The averaged speed-dependent reflex torque (ASRT), defined as the measured torque deviated from the baseline torque, is used for quantifying the spastic hypertonia. Four subjects having incurred cerebrovascular accident (CVA) are recruited for time-course study in which the measurements are taken at 72 hours, one week, one month, three months, and six months after onset of stroke. During the development of spasticity, the changes of ASRT and velocity sensitivity of ASRT of the involved and the intact elbow joints are discussed. Copyright (C) 2000 Elsevier Science Ltd.
UR - http://www.scopus.com/inward/record.url?scp=0033965015&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033965015&partnerID=8YFLogxK
U2 - 10.1016/S1050-6411(99)00018-8
DO - 10.1016/S1050-6411(99)00018-8
M3 - Article
C2 - 10659445
AN - SCOPUS:0033965015
SN - 1050-6411
VL - 10
SP - 1
EP - 14
JO - Journal of Electromyography and Kinesiology
JF - Journal of Electromyography and Kinesiology
IS - 1
ER -