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Convergent and criterion-related validity of the short form of the International Physical Activity and the Incidental and Planned Physical Activity Questionnaires in people with multiple sclerosis.

BACKGROUND
Assessing physical activity (PA) in people with multiple sclerosis (PwMS) is essential to follow-up the recommended PA level. The International Physical Activity Questionnaire (IPAQ) and the Incidental and Planned Exercise Questionnaire (IPEQ) have been widely used, but their validity has not been investigated previously in PwMS.


OBJECTIVE
This study aimed to assess the convergent and criterion validity of the IPAQ and the IPEQ in PwMS.


METHODS
50 PwMS were asked to wear an Actigraph for seven days and to fill the IPAQ and IPEQ. Sedentary, moderate (MPA), vigorous (VPA) and moderate to vigorous PA (MVPA) levels were recorded.


RESULTS
Significant correlations were found between sitting time as reported by IPAQ and sedentary time as recorded by Actigraph (r = 0.41, p = 0.003), VPA by IPAQ and VPA as recorded by Actigraph (r = 0.46, p = 0.001), and MVPA by IPAQ and MVPA by Actigraph (r = 0.36, p = 0.011). IPEQ showed poor both criterion and convergent validity when compared to the Actigraph. Both IPAQ and IPEQ overestimate the intensities of PA for all the derived parameters.


CONCLUSIONS
Findings of this study are important as they suggest that IPAQ in particular had convergent validity when compared to Actigraph data, but still had the problem of overestimating PA levels.