• HuijnenIvan P JIPJDepartment of Rehabilitation Medicine, Research School CAPHRI, Maastricht University, P.O. Box 616, 6200 MD Maastricht, The Netherlands Adelante Centre of Expertise in Rehabilitation and Audiology, P.O. Box 88, 6430 AB Hoensbroek, The Ne, Jeanine A Verbunt, Madelon L Peters, Philippe Delespaul, KindermansHanne P JHPJ, Jeffrey Roelofs, Marielle Goossens, and SeelenHenk A MHAM.
• Department of Rehabilitation Medicine, Research School CAPHRI, Maastricht University, P.O. Box 616, 6200 MD Maastricht, The Netherlands Adelante Centre of Expertise in Rehabilitation and Audiology, P.O. Box 88, 6430 AB Hoensbroek, The Netherlands Department of General Practice, Research School CAPHRI, Maastricht University, P.O. Box 616, 6200 MD Maastricht, The Netherlands Department of Clinical Psychological Science, Maastricht University, P.O. Box 616, 6200 MD Maastricht, The Netherlands Mental Health & NeuroSciences (MHeNS), Maastricht University, P.O. Box 616, 6200 MD Maastricht, The Netherlands.
• Pain. 2010 Jul 1; 150 (1): 161-166.

AbstractPatients with chronic pain may have difficulties estimating their own physical activity level in daily life. Pain-related factors such as depression and pain intensity may affect a patients' ability to estimate their own daily life activity level. This study evaluates whether patients with Chronic Low Back Pain (CLBP) who are more depressed and/or report more pain indeed have a lower objectively assessed daily life activity level or whether they only perceive their activity level as lower. Patients with CLBP were included in a cross-sectional study. During 14days physical activity in daily life was measured, with both an electronic diary and an accelerometer. Multilevel analyses were performed to evaluate whether a higher level of depression and/or pain intensity was associated with a lower objectively assessed activity level or the discrepancy between the self-reported and objectively assessed daily life activity levels. Results, based on 66 patients with CLBP (mean RDQ score 11.8), showed that the objectively assessed daily life activity level is not associated with depression or pain intensity. There was a moderate association between the self-reported and objectively assessed activity levels (beta=0.39, p<0.01). The discrepancy between the two was significantly and negatively related to depression (beta=-0.19, p=0.01), indicating that patients who had higher levels of depression judged their own activity level to be relatively low compared to their objectively assessed activity level. Pain intensity was not associated with the perception of a patient's activity level (beta=0.12, ns).Copyright 2010 International Association for the Study of Pain. Published by Elsevier B.V. All rights reserved.

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