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 resp... Mehr ...