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Article

Motor Imagery Performance and Tactile Spatial Acuity: Are They Altered in People with Frozen Shoulder?

1
School of Medical Sciences, Faculty of Medicine and Health, The University of Sydney, Sydney 2006, Australia
2
The Clinical Research Institute, Sydney 2145, Australia
3
Neuroscience Research Australia (NeuRA), Hospital Rd, Randwick 2013, Australia
4
School of Medical Sciences, Faculty of Medicine, University of New South Wales, Sydney 2033, Australia
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2020, 17(20), 7464; https://doi.org/10.3390/ijerph17207464
Received: 7 August 2020 / Revised: 9 October 2020 / Accepted: 11 October 2020 / Published: 14 October 2020
(This article belongs to the Special Issue Translational Aspects of Motor Imagery)
Frozen shoulder (adhesive capsulitis) is a severe chronic pain condition that is not well understood and current treatment is suboptimal. In several other chronic pain conditions motor imagery and tactile acuity deficits are present, which are thought to represent associated neuroplastic changes. The aims of this study were to determine if motor imagery performance assessed by the left/right judgement task, and tactile acuity assessed by two-point discrimination, are altered in people with unilateral frozen shoulder. In this cross-sectional, prospective study eighteen adults diagnosed with frozen shoulder in a physiotherapy clinic setting completed a left/right judgement task, response times (RT) and accuracy for the left/right judgement task were determined. Next, tactile acuity over both shoulders was assessed with a novel, force-standardised two-point discrimination test. Results corresponding to the affected side were compared to the pain free shoulder; Left/right judgement task: mean RT (SD) corresponding to the affected shoulder was significantly slower than RT for the healthy shoulder (p = 0.031). There was no side-to-side difference in accuracy (p > 0.05). Neither RT nor accuracy was related to pain/disability scores or duration of symptoms (p > 0.05). Two-point discrimination: mean two-point discrimination threshold of the affected shoulder was significantly larger than the contralateral healthy shoulder (p < 0.001). Two-point discrimination threshold was not related to pain/disability scores or pain duration (p > 0.05); One explanation for these findings is altered sensorimotor processing and/or disrupted sensorimotor cortex representations of the affected shoulder. A case then exists for the use of treatments aimed at reversing these changes, training the brain to reduce chronic shoulder pain. View Full-Text
Keywords: left/right judgement; two-point discrimination; adhesive capsulitis; chronic pain left/right judgement; two-point discrimination; adhesive capsulitis; chronic pain
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MDPI and ACS Style

Breckenridge, J.D.; McAuley, J.H.; Ginn, K.A. Motor Imagery Performance and Tactile Spatial Acuity: Are They Altered in People with Frozen Shoulder? Int. J. Environ. Res. Public Health 2020, 17, 7464. https://doi.org/10.3390/ijerph17207464

AMA Style

Breckenridge JD, McAuley JH, Ginn KA. Motor Imagery Performance and Tactile Spatial Acuity: Are They Altered in People with Frozen Shoulder? International Journal of Environmental Research and Public Health. 2020; 17(20):7464. https://doi.org/10.3390/ijerph17207464

Chicago/Turabian Style

Breckenridge, John D., James H. McAuley, and Karen A. Ginn. 2020. "Motor Imagery Performance and Tactile Spatial Acuity: Are They Altered in People with Frozen Shoulder?" International Journal of Environmental Research and Public Health 17, no. 20: 7464. https://doi.org/10.3390/ijerph17207464

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