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Title: Postural recovery following voluntary arm movement is impaired in people with chronic low back pain
Authors: Mok, NWK 
Brauer, SG
Hodges, PW
Keywords: Chronic low back pain
Limb movement
Postural control
Issue Date: May-2011
Publisher: Elsevier
Source: Gait and posture, May 2011, v. 34, no.1, p. 97-102 How to cite?
Journal: Gait and posture 
Abstract: Study design: Recovery of postural equilibrium following bilateral voluntary arm movement was evaluated using a case-control study, with 13 subjects with chronic LBP and 13 age- and gendermatched control subjects.
Objectives: To evaluate control of the centre-of-pressure (COP), as a marker of the quality of control of postural equilibrium associated with voluntary arm movements, in people with and without LBP. Summary of background data. When healthy individuals perform rapid voluntary arm movements, small spinal movements (preparatory movement) opposite to the direction of the reactive moments precede voluntary armmovements. Evaluation of trunk movement in people with LBP suggests that this strategy is used infrequently in this population and is associated with an increased spinal displacement following arm flexion. As the preparatory spinal movement was also thought to be an anticipatory mechanism limiting postural perturbation caused by arm movements, we hypothesized that LBP subjects would have compromised control of postural equilibrium following arm flexion.
Methods: Subjects performed bilateral voluntary rapid arm flexion while standing on support surface of different dimensions with eyes opened or closed.
Results: Results indicated that people with LBP consistently took longer to recover postural equilibrium and made more postural adjustments in different stance conditions. However, there was no increase in the excursion of the COP during the recovery period in the LBP group.
Conclusion: These data suggest that while COP is tightly controlled during postural recovery, the finetuning of the control of postural equilibrium is compromised in people with LBP. Postural control dysfunctions should be considered in the management of chronic low back pain.
ISSN: 0966-6362
EISSN: 1879-2219
DOI: 10.1016/j.gaitpost.2011.03.021
Rights: Gait & posture © 2011 Elsevier B.V. All rights reserved. The journal web site is located at
NOTICE: this is the author’s version of a work that was accepted for publication in Gait & posture. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Gait & posture, vol. 34, no. 1 (May 2011), DOI: 10.1016/j.gaitpost.2011.03.021
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