Pediatric Exercise Science · 2018 · 15 citations · 28 references
Video direct observation was capable of detecting and characterizing children's entire recess PA while providing valuable context to the behavior. The authors confirmed previous findings that PA intensity was not uniform by schoolyard location and further differences exist by sex and weight status.
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CDC growth charts: United States.
Robert J. Kuczmarski, Cynthia L. Ogden, Laurence M. Grummer‐Strawn et al. · PubMed · 2000 · 5.2K citations
The association of school environments with youth physical activity
James F. Sallis, Terry L. Conway, Judith J. Prochaska et al. · American Journal of Public Health · 2001 · 497 citations · Full text