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Reliability of the Isokinetic Trunk Extensor Test, Biering-Sørensen Test, and Åstrand Bicycle Test: Assessment of Intraclass Correlation Coefficient and Critical Difference in Patients With Chronic Low Back Pain and Healthy Individuals

Keller, Anne, MD,*; Hellesnes, Jan, PT,*; Jens I. Brox, and, MD, PhD

Health Services Research
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Study Design.  A reliability study was performed.

Objective. To determine the intersession reproducibility of the isokinetic trunk extensor strength test, the Biering-Sørensen test, and the Åstrand test by calculation of the intraclass correlation coefficient and the critical difference.

Summary of Background Data.  Several physical measurements have been used in clinical evaluation of patients with chronic low back pain. Reliability can be evaluated by calculation of either intraclass correlation coefficient or critical difference, but interpretation of the results may vary depending on which method is used.

Methods. For this study, 31 patients with chronic low back pain carried out the isokinetic trunk extensor test, the Biering-Sørensen test, and the Åstrand test as also did age- and gender-matched healthy individuals. Measurements were performed in three separate sessions at the same time of the day and by the same experienced examiner. The intervals between the sessions were 5 to 10 days.

Results. The isokinetic tests showed a learning effect between Tests 1 and 2. For the isokinetic test, the critical difference increased with increased angular velocities from 28% to 63% in the patients and from 27% to 39% in the healthy subjects. The critical differences for the patients and the healthy individuals were 57%vs 54% for the Biering-Sørensen test and 21%vs 23% for the Åstrand test, respectively. The intraclass correlation coefficient ranged from 93% to 98% in the patients and 80%-98% in the healthy individuals.

Conclusions. The reliability was found to be acceptable for the Åstrand test and the isokinetic test at 60° per second, as evaluated by the critical difference. All the tests were highly reliable according to the intraclass correlation coefficient, except for Biering-Sørensen test for healthy individuals. The critical difference is the preferable measure because calculation of the intraclass correlation coefficient may give a misleading high estimate of reliability.

From the *Department of Physical Medicine and Rehabilitation, University Hospital Ullevaal, and the †Oslo Ortopaedic University Hospital/National Hospital, Oslo, Norway.

Acknowledgment date: May 11, 2000.

Acceptance date: July 24, 2000.

Device status category: 1.

Conflict of interest category: 14.

© 2001 Lippincott Williams & Wilkins, Inc.