# name
Physical activity and sedentary behaviour in daily life: A
                comparative analysis of the Global Physical Activity
                Questionnaire (GPAQ) and the SenseWear armband

# metadata.dc.description.abstract[].value
Reduction of sedentary time and an increase in physical activity
                offer potential to improve public health. However, quantifying
                physical activity behaviour under real world conditions is a
                major challenge and no standard of good practice is available.
                Our aim was to compare the results of physical activity and
                sedentary behaviour obtained with a self-reported instrument
                (Global Physical Activity Questionnaire (GPAQ)) and a wearable
                sensor (SenseWear) in a repeated measures study design. Healthy
                adults (41 in Antwerp, 41 in Barcelona and 40 in London) wore
                the SenseWear armband for seven consecutive days and completed
                the GPAQ on the final day. This was repeated three times. We
                used the Wilcoxon signed rank sum test, Spearman correlation
                coefficients, mixed effects regression models and Bland-Altman
                plots to study agreement between both methods. Mixed models were
                used to assess the effect of personal characteristics on the
                absolute and relative difference between estimates obtained with
                the GPAQ and SenseWear. Moderate to vigorous energy expenditure
                and duration derived from the GPAQ were significantly lower
                (p<0.05) compared to the SenseWear, yet these variables
                showed significant correlations ranging from 0.45 to 0.64.
                Estimates of vigorous-intensity physical activity in particular
                showed high similarity (r>0.59). Results for sedentary
                behaviour did not differ, yet were poorly correlated
                (r<0.25). The differences between all variables were
                reproducible across repeated measurements. In addition, we
                observed a relationship between these differences and BMI, body
                fat and physical activity domain. Due to the lack of a
                standardized protocol, results from different studies measuring
                physical activity and sedentary behaviour are difficult to
                compare. Therefore, we suggested an easy-to-implement approach
                for future studies adding the GPAQ to the wearable of choice as
                a basis for comparisons.

# metadata.dc.relation.isformatof[].value
Reproducció del document publicat a:
                http://dx.doi.org/10.1371/journal.pone.0177765

# metadata.dc.source[].value
Articles publicats en revistes (ISGlobal)

# metadata.dc.title[].value
Physical activity and sedentary behaviour in daily life: A
                comparative analysis of the Global Physical Activity
                Questionnaire (GPAQ) and the SenseWear armband