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Results The total number of MET-minutes per week reported on the questionnaire correlated modestly with the main criterion measure of total weekly activity counts measured by the accelerometer (r = 0.41, p = 0.023). However, time spent in both moderate and vigorous physical activity was over reported on the questionnaire. The mean difference compared to accelerometer was 546.63 minutes per week (95% CI 217.1 to 871.2 minutes) for moderate and 295.33 minutes per week (95% CI 88.08 to 502.6 minutes) for vigorous activity. The tool’s sensitivity to detect individuals with insufficient physical activity to derive a health benefit was low (9.5%), however specificity was high (100%). Discussion We conclude that self-reported physical activity measured by this questionnaire correlates with the objective criterion of accelerometry, but substantial over-reporting occurs. The tool may be useful in screening physical activity levels but should not be used to determine precise amounts of activity.

retrovirology

The international physical activity questionnaire overestimates moderate and vigorous physical activity in Human Immunodeficiency Virus compared with accelerometry