1012 Understanding of physical activity patterns in young people has been hampered by reliance on self-report measures of behavior and inability to compare measures across youth of varying ages. The purpose of this Current Issue session is to present findings from a major study designed to enhance understanding of the patterns and correlates of physical activity in youth of a wide age range. The unique aspects of this study are that it (a) was designed and implemented by a multi-disciplinary group of investigators, (b) long-term objective monitoring was used to assess youth physical activity, (c) children in grades 1 through 12 were studied, and (d) potential social and environmental determinants of physical activity were assessed. Survey data were collected from more than 1100 youth, and monitor data were completed by a subset of 385. The first paper quantifies age and sex differences in moderate and vigorous intensity physical activity. Other papers examine social and environmental correlates of physical activity, differences in correlates among normal-weight and overweight youth, and gender differences in parent-child associations in physical activity.
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