Assessment of the physical activity level with two questions: validation with doubly labeled water.

G. Johansson*, K.R. Westerterp

*Corresponding author for this work

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    Objective:To validate a two-question questionnaire on physical activity with the doubly labeled water (DLW) method.Design:Cross-sectional study.Subjects:Nine volunteers, age 33-75 years, with a mean body mass index (BMI) (kg m(-2)) of 27.4.Measurements:A questionnaire with one question on physical activity at work and one question on physical activity during leisure time. The answers were converted into a PAL (physical activity level=energy expenditure/basal metabolic rate) value, which was validated with the DLW method.Results:The mean values (s.d.) of PAL for the questionnaire and DLW measurements were 1.7 (0.1) and 1.7 (0.1), respectively, with a mean difference of 0.004 (0.172).Conclusions:The results were promising to the extent that they could be used in large-scale epidemiological studies.International Journal of Obesity advance online publication, 8 April 2008; doi:10.1038/ijo.2008.42.
    Original languageEnglish
    Pages (from-to)1031-1033
    JournalInternational Journal of Obesity
    Issue number6
    Publication statusPublished - 1 Jan 2008

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