Daily physical activity in ankylosing spondylitis: validity and reliability of the IPAQ and SQUASH and the relation with clinical assessments

Suzanne Arends, Marianne Hofman, Yvo P T Kamsma, Eveline van der Veer, Pieternella M Houtman, Cees G M Kallenberg, Anneke Spoorenberg, Elisabeth Brouwer, Suzanne Arends, Marianne Hofman, Yvo P T Kamsma, Eveline van der Veer, Pieternella M Houtman, Cees G M Kallenberg, Anneke Spoorenberg, Elisabeth Brouwer

Abstract

Introduction: The aim of this study was to investigate the construct validity and test-retest reliability of the International Physical Activity Questionnaire (IPAQ; long form) and the Short QUestionnaire to Assess Health-enhancing physical activity (SQUASH) and to investigate the relation between daily physical activity and clinical assessments in patients with ankylosing spondylitis (AS).

Methods: For validity, the self-report questionnaires IPAQ and SQUASH were compared with daily physical activity assessed with the ActiGraph accelerometer during 7 consecutive days in 63 AS outpatients. For reliability, the IPAQ and SQUASH were administered twice approximately 1 week apart in 52 AS outpatients. In all 115 patients, clinical assessments were performed at the outpatient clinic.

Results: IPAQ and SQUASH total scores correlated significantly with accelerometer outcome: ρ = 0.38 and r = 0.35, respectively. Intraclass correlation coefficients between first and second assessments of the IPAQ and SQUASH were 0.83 and 0.89, respectively. Bland-Altman analyses showed no systemic bias, but in particular for the IPAQ the 95% limits of agreement were wide. Daily physical activity assessed by accelerometer, IPAQ, and SQUASH correlated significantly with disease activity, physical activity, and quality of life. A relation with spinal mobility was found only for the accelerometer and SQUASH. The direction of these correlations indicates that higher daily physical activity is related to lower disease activity and better physical function, spinal mobility and quality of life.

Conclusions: Both physical activity questionnaires showed modest construct validity. The SQUASH showed good test-retest reliability, superior to the IPAQ. These results indicate that the SQUASH is more suitable than the IPAQ to assess daily physical activity in AS population studies. However, it is desirable to add questions on AS-specific physical activity. Further studies are needed to investigate the causality of the relation between daily physical activity and clinical assessments.

Figures

Figure 1
Figure 1
Relation between questionnaire total scores and accelerometer activity counts. Relation between (A) International Physical Activity Questionnaire (IPAQ) and (B) Short QUestionnaire to Assess Health-enhancing physical activity (SQUASH) total scores and accelerometer activity counts.
Figure 2
Figure 2
Bland-Altman plots. Difference between the total scores on the first and second (A) International Physical Activity Questionnaire (IPAQ) and (B) Short QUestionnaire to Assess Health-enhancing physical activity (SQUASH) plotted against the mean of both assessments, together with 95% limits of agreement (LOA). CI, confidence interval.

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