Kapteyn, Arie Banks, James Hamer, Mark Smith, James P. Steptoe, Andrew van Soest, Arthur Koster, Annemarie Wah, Saw Htay What they say and what they do: comparing physical activity across U.S., England, and the Netherlands 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), United States (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 versus non-working respondents). The accelerometer data, however, showed dramatic differences; the Dutch appeared to be much more physically active than Americans and English (For instance, among respondents 50 or older only 5% of Americans and 3% of English were active enough to make it into the highest 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. Physical activity;Accelerometer;Self-report;Medical and Health Sciences not elsewhere classified 2018-01-15
    https://repository.lboro.ac.uk/articles/journal_contribution/What_they_say_and_what_they_do_comparing_physical_activity_across_U_S_England_and_the_Netherlands/9611822