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Analysis of the quality of wrist movement during a simple tracking task

Analysis of the quality of wrist movement during a simple tracking task
Analysis of the quality of wrist movement during a simple tracking task
Objective assessment of stroke-patients' ability to control arm movements is vital for evidence-based therapy and progress monitoring. This study compares three different indices to quantify the quality of wrist movement during a task involving tracking a target on a screen. Each method is assessed in terms of agreement between assessors (Bland and Altman limits of agreement); repeatability of readings by the same assessor (reliability coefficient); and external validity on data collected from a sample of people with impaired upper limb function and an age matched unimpaired control group. The three indices were the root mean square difference between the wrist movement and the target signal, the cross correlation between these two signals, and an estimate of the signal-to-noise ratio in the wrist movement. External validity was investigated by calculating the correlation between each measure for wrist movement, and upper limb function assessed by the action research arm test. The results of the Bland and Altman limits of agreement show that all indices were similar in performance. The cross correlation had the highest reliability coefficient for the impaired group. In terms of external validity, the cross correlation and signal-to-noise indices showed the strongest association with functional performance and may thus be the more relevant for future clinical investigations.Keywords: tracking, stroke, motor control, upper limb
tracking, stroke, motor control, upper limb
0967-3334
881-895
Notley, Scott V.
458553fe-2c63-4844-8df1-3538c4b79cda
Turk, Ruth
9bb21965-6f9f-4c9c-8505-94df8e168f52
Pickering, Ruth
4a828314-7ddf-4f96-abed-3407017d4c90
Simpson, David M.
53674880-f381-4cc9-8505-6a97eeac3c2a
Burridge, Jane H.
0110e9ea-0884-4982-a003-cb6307f38f64
Notley, Scott V.
458553fe-2c63-4844-8df1-3538c4b79cda
Turk, Ruth
9bb21965-6f9f-4c9c-8505-94df8e168f52
Pickering, Ruth
4a828314-7ddf-4f96-abed-3407017d4c90
Simpson, David M.
53674880-f381-4cc9-8505-6a97eeac3c2a
Burridge, Jane H.
0110e9ea-0884-4982-a003-cb6307f38f64

Notley, Scott V., Turk, Ruth, Pickering, Ruth, Simpson, David M. and Burridge, Jane H. (2007) Analysis of the quality of wrist movement during a simple tracking task. Physiological Measurement, 28 (8), 881-895. (doi:10.1088/0967-3334/28/8/011).

Record type: Article

Abstract

Objective assessment of stroke-patients' ability to control arm movements is vital for evidence-based therapy and progress monitoring. This study compares three different indices to quantify the quality of wrist movement during a task involving tracking a target on a screen. Each method is assessed in terms of agreement between assessors (Bland and Altman limits of agreement); repeatability of readings by the same assessor (reliability coefficient); and external validity on data collected from a sample of people with impaired upper limb function and an age matched unimpaired control group. The three indices were the root mean square difference between the wrist movement and the target signal, the cross correlation between these two signals, and an estimate of the signal-to-noise ratio in the wrist movement. External validity was investigated by calculating the correlation between each measure for wrist movement, and upper limb function assessed by the action research arm test. The results of the Bland and Altman limits of agreement show that all indices were similar in performance. The cross correlation had the highest reliability coefficient for the impaired group. In terms of external validity, the cross correlation and signal-to-noise indices showed the strongest association with functional performance and may thus be the more relevant for future clinical investigations.Keywords: tracking, stroke, motor control, upper limb

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More information

Submitted date: 22 December 2006
Published date: August 2007
Keywords: tracking, stroke, motor control, upper limb

Identifiers

Local EPrints ID: 49347
URI: http://eprints.soton.ac.uk/id/eprint/49347
ISSN: 0967-3334
PURE UUID: 1005ae05-45d0-49fd-9079-b4e17231c329
ORCID for Ruth Turk: ORCID iD orcid.org/0000-0001-6332-5353
ORCID for David M. Simpson: ORCID iD orcid.org/0000-0001-9072-5088
ORCID for Jane H. Burridge: ORCID iD orcid.org/0000-0003-3497-6725

Catalogue record

Date deposited: 31 Oct 2007
Last modified: 16 Mar 2024 03:38

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Contributors

Author: Scott V. Notley
Author: Ruth Turk ORCID iD
Author: Ruth Pickering

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