What they say and what they do:Comparing physical activity across the USA, 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), 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 r... Mehr ...