We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleModerate-to-vigorous physical activity from ages 9 to 15 years.AuthorsNader PR; Bradley RH; Houts RM; McRitchie SL; O'Brien MPublicationJAMA, 2008, Vol 300, Issue 3, p295ISSN1538-3598Publication typearticleDOI10.1001/jama.300.3.295