Kapteyn, A; Banks, J; Hamer, M; Smith, JP; Steptoe, A; van Soest, A; Koster, A; Kapteyn, A; Banks, J; Hamer, M; Smith, JP; Steptoe, A; van Soest, A; Koster, A; Htay Wah, S; - view fewer (2018) What they say and what they do: comparing physical activity across the USA, England and the Netherlands. Journal of Epidemiology and Community Health 10.1136/jech-2017-209703. (In press).

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Abstract

BACKGROUND: Physical activity (PA) is important for maintaining health, but there are fundamental unanswered questions on how best it should be measured. METHODS: We measured PA in the Netherlands (n=748), the USA (n=540) and England (n=254), both by a 7 day wrist-worn accelerometer and by self-reports. The self-reports included a global self-report on PA and a report on the frequency of vigorous, moderate and mild activity. RESULTS: The self-reported data showed only minor differences across countries and across groups within countries (such as different age groups or working vs non-working respondents). The accelerometer data, however, showed large differences; the Dutch and English appeared to be much more physically active than Americans h (For instance, among respondents aged 50 years or older 38% of Americans are in the lowest activity quintile of the Dutch distribution). In addition, accelerometer data showed a sharp decline of PA with age, while no such pattern was observed in self-reports. The differences between objective measures and self-reports occurred for both types of self-reports. CONCLUSION: It is clear that self-reports and objective measures tell vastly different stories, suggesting that across countries people use different response scales when answering questions about how physically active they are.

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