BACKGROUND: Sufficient levels of moderate to vigorous physical activity (MVPA) give substantial health benefits to adolescents. This article examines trends in physical activity (PA) from 2002 to 2010 across 32 countries from Europe and North America. METHODS: Representative samples included 479 674 pupils (49% boys) aged 11 years (n = 156 383), 13 years (n = 163 729) and 15 years (n = 159 562). The trends in meeting the recommendations for PA (at least 60 min daily) were evaluated using logistic regression. RESULTS: There was a slight overall increase between 2002 and 2010 (17.0% and 18.6%, respectively). MVPA increased significantly (P ≤ 0.05) among boys in 16 countries. Conversely, nine countries showed a significant decrease. Among girls, 10 countries showed a significant increase (P ≤ 0.05). Eight countries showed a significant decrease. For all countries combined, girls were slightly less likely to show an increase in PA over time. CONCLUSIONS: The majority of adolescents do not meet current recommendations of PA. Further investment at national and international levels is therefore necessary to increase PA participation among children and adolescents and reduce the future health burden associated with inactivity.

Child and Adolescent Health Research Unit School of Medicine University of St Andrews St Andrews Scotland

College of Nursing and Health Sciences Exercise and Health Sciences University of Massachusetts Boston Boston USA

Department of Health Sciences University of Jyväskylä Jyväskylä Finland

Faculty of Sport NLA University College Norway

Institute of Active Lifestyle Faculty of Physical Culture Palacky University in Olomouc Olomouc Czech Republic

WHO Collaborating Centre for Child and Adolescent Health Promotion School of Public Health Bielefeld University Bielefeld Germany

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