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How active are American adolescents and have they become less active?
Obesity Reviews, 11/06/09

Li S et al. – US adolescents had less physical activity (PA) but more sedentary behaviours than recommended, but showed no clear evidence of becoming less active. In 2007, 24.9% reported on average spending >=3 h of screen time per day for non–school work; only 34.7% met the current PA recommendations, and it (25.6%) was even lower in girls. The prevalence of having sufficient vigorous PA changed little between 1993 and 2005 (from 65.8% to 64.1%). Encouraging changes regarding TV viewing time and physical education (PE) were detected. PE daily attendance rate and exercising >20 min during an average PE class increased significantly, while watching TV >=3 h d^?1 decreased significantly in recent years. Considerable sex, age and ethnic differences existed in the patterns and trends. These national data show no clear evidence of declining PA among US adolescents in recent years. Reduced PA is not likely the major explanation of the recent increase in obesity among US adolescents.

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Encouraging Walking for Transport and Physical Activity in Children and Adolescents: How Important is the Built Environment?
Sports Medicine, 11/12/09 Relevance Score: 81%

Physical Activity Opportunities Associated With Fitness and Weight Status Among Adolescents in Low-Income Communities
Archives of Pediatrics and Adolescent Medicine, 11/06/09 Relevance Score: 80%

Secular trends in physical fitness in Danish adolescents
Scandinavian Journal of Medicine and Science in Sports, 10/09/09 Relevance Score: 80%

Physical Fitness in Children With High Motor Competence Is Different From That in Children With Low Motor Competence
Physical Therapy, 10/05/09 Relevance Score: 70%

Decrease In Physical Activity May Not Be A Factor In Increased Obesity Rates Among Adolescents
ScienceDaily, 11/04/09 Relevance Score: 69%