Reliability and sensitivity of a wrist rig to measure motor control and spasticity in post-stroke hemiplegia


Turk, Ruth, Notley, Scott V., Pickering, Ruth M., Simpson, David M., Wright, Philip A. and Burridge, Jane H. (2008) Reliability and sensitivity of a wrist rig to measure motor control and spasticity in post-stroke hemiplegia. Neurorehabilitation and Neural Repair, 22, (6), 684-696. (doi:10.1177/1545968308315599).

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Description/Abstract

Background. Objective assessment of impairments after stroke is vital for evidence-based therapy and progress monitoring.

Objective. This study determines the utility of outcome measures obtained from an instrumented wrist rig for future rehabilitation trials. The tests undertaken were evaluated in terms of sensitivity to detect differences between normal and impaired participants, test-retest repeatability (repeatability coefficient and intraclass correlation coefficient [ICC]), and interrater agreement (Bland and Altman limits of agreement).

Methods . Twelve participants with chronic poststroke hemiparesis (mean 5.6 years); and 12 unimpaired volunteers performed a series of tasks in the rig. The hemiparetic arm (impaired group) and dominant arm (unimpaired group) were tested in 3 sessions on the same day by 2 assessors. Signals were analyzed to derive a tracking index (motor control), stretch index (spasticity), flexor modulation index (FMI) (muscle activation), force angle index (FAI) (stiffness), range of movement, and isometric force.

Results and Conclusions. The means of all tests differed between impaired and unimpaired participants except for range of movement into flexion, the FAI, and the FMI. Repeatability coefficients for each test are presented as benchmark values for use in future trials in which the wrist rig tests may be used to detect change. Test-retest reliability was excellent in the impaired group (ICC = 0.88-0.98) and poor to excellent in the unimpaired group (ICC = 0.06-0.89). The Bland-Altman ranges showed no bias between assessors, and that the interassessor variability was similar to that between repeats by the same assessor for most tests.

Item Type: Article
ISSNs: 1545-9683 (print)
Keywords: hemiparesis, motor control, spasticity, measurement, wrist
Subjects: R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: University Structure - Pre August 2011 > Institute of Sound and Vibration Research > Signal Processing and Control
University Structure - Pre August 2011 > School of Medicine > Community Clinical Sciences
ePrint ID: 65348
Date Deposited: 13 Feb 2009
Last Modified: 27 Mar 2014 18:46
URI: http://eprints.soton.ac.uk/id/eprint/65348

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