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Comparisons in Muscle Function and Training Rehabilitation Outcomes Between Avoidance-Endurance Model Subgroups

Fehrmann, Elisabeth MSc*,†; Tuechler, Kerstin MSc*; Kienbacher, Thomas MD*; Mair, Patrick PhD*,‡; Spreitzer, Juliane BSc*; Fischer, Linda MSc*; Kollmitzer, Josef PhD*,§,∥; Ebenbichler, Gerold MD*,¶

doi: 10.1097/AJP.0000000000000479
Original Articles

Objectives: Evidence suggests that chronic low back pain patients with fear-avoidance (FAR) or endurance behavior are at risk of treatment failure and pain maintenance, with bodily overuse or underuse being assumed as mediating mechanisms for pain chronification. This study sought to examine whether or not the avoidance-endurance model subgroups, FAR, distress-endurers (DER), eustress-endurers (EER), and adaptive responders (AR), differed in physical measures and outcomes after training therapy.

Materials and Methods: A total of 137 chronic low back pain patients were assessed before, at the end of, and 6 months after a 6-month rehabilitation training. Patients performed maximum back extension strength and trunk range-of-motion measures, flexion-relaxation tests, and completed the following questionnaires: Avoidance-Endurance Questionnaire, Roland-Morris Disability Questionnaire, Pain Disability Index, 36-Item Short-Form Health Survey, International Physical Activity Questionnaire, and visual analog scale. Statistical analysis included cluster analysis, analysis of covariances, and mixed-effects models.

Results: At baseline, avoidance-endurance model subgroups did not differ in physical measures and activity levels. At the end of training, patients’ back-related health was significantly improved in all subgroups. However, the DER and the FAR were found to be more impaired before and after the intervention compared with EER and AR, as indicated by a higher pain intensity, higher disability levels, lower quality of life, and inferior working capacity.

Discussion: Although FAR and DER did not differ in physical measures or activity levels from EER and AR, they demonstrated poor lower back-related health at baseline and after intervention. Thus, future research should elucidate as to which additional interventions could optimize their health.

*Karl-Landsteiner-Institute of Outpatient Rehabilitation Research

Karl Landsteiner University of Health Sciences, Department of Psychology

§Technical School of Engineering

University of Applied Sciences, Department of Biomedical Engineering

Department of Physical Medicine and Rehabilitation, Medical University Vienna, Austria

Department of Psychology, Harvard University, Cambridge, MA

The authors declare no conflict of interest.

Reprints: Elisabeth Fehrmann, MSc, Karl-Landsteiner-Institute of Outpatient Rehabilitation Research, Porschestr. 29, Vienna A-1230, Austria (e-mail: efehrman@edu.aau.at).

This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal. http://creativecommons.org/licenses/by-nc-nd/4.0/

Received August 9, 2016

Received in revised form November 29, 2016

Accepted January 15, 2017

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