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ackground: Regular physical activity has many health-enhancing effects among patients with a physical disability or chronic disease. Accurate assessment of physical activity behaviour is a key factor in ascertaining these health benefits to occur. The adjusted Short QUestionnaire to ASsess Health-enhancing physical activity (adjusted SQUASH) intends to measure this multidimensional construct. This questionnaire has, however, not yet been validated. Objective: The purpose of this study was to determine the concurrent validity of the adjusted SQUASH using the Actiheart activity monitor. Methods: Patients with a physical disability or chronic disease wore the Actiheart activity monitor for one week. Following this period the adjusted SQUASH was completed. The results of the adjusted SQUASH were compared to the data of the Actiheart using a Spearman’s rank correlation and a Bland-Altman analysis. Results: Twenty-one patients (16 women and 5 men, mean age 45 years ± 22) were included for analysis. A significant Spearman’s correlation coefficient was found between the total activity scores of the adjusted SQUASH and the Actiheart, ρ = 0.49. Spearman’s correlation coefficient was 0.38 (p>0.05) for time spent in light activity, 0.02 (p>0.05) for moderate activity and 0.34 (p>0.05) for intensive activity. Bland-Altman analysis showed good agreement between the two measuring methods. Conclusion: The adjusted SQUASH is a fair to good instrument in measuring physical activity behaviour among patients with a physical disability or chronic disease. Future research needs to confirm these results. Keywords: physical activity, questionnaire, concurrent validity Introduction Background It is a well-known fact that people with a physical disability or chronic disease are less active in daily activities compared to the healthy population (Millan-Calenti et al., 2010). As a result of this physical inactivity they are more at risk of developing a negative spiral deriving from an inactive lifestyle. Obesity, cardiovascular diseases and a reduced quality of life are a few examples of the many health concerns that can be a consequence of this negative spiral (Buffart et al., 2008). There are norms that state how physically active a person at least should be. As an example, for the healthy Dutch population these norms are set at a recommended minimum

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