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The National Institute of Child Health and Human Development Study of Early Child Care and Youth Development Network

Arch Pediatr Adolesc Med. 2003;157:185-190.

Background  Health recommendations are for preadolescent children to have daily school physical education (PE) classes that engage children in moderate to vigorous physical activity at least 50% of class time.

Objective  To observe activity of children in PE classes in third grades across 10 different sites.

Design  Observational study.

Setting  Six hundred eighty-four elementary schools in 10 sites.

Subjects  A total of 814 children (414 boys, 400 girls; mean age, 9.0 years) enrolled in the National Institute of Child Health and Human Development Study of Early Child Care and Youth Development.

Methods  Each child was observed during 1 scheduled PE class.

Main Outcome Measure  The SOFIT (System for Observing Fitness Instruction Time) observation method, a validated, heart rate observation system, yields levels of activity the child is engaged in as well as the lesson context, type of teacher, and location of the PE class.

Results  Children averaged 2.1 PE lessons per week, of 33 minutes each. Only 5.9% of children had daily PE. Children accrued 4.8 very active and 11.9 minutes of moderate to vigorous physical activity per PE lesson, 15.0% and 37.0% of lesson time, respectively. Lesson length and number of minutes per week were similar for boys and girls; however, boys spent proportionately more PE time in very active and moderate to vigorous activity. This resulted in boys having a higher energy expenditure rate than girls.

Conclusion  Children observed in this study received 25 min/wk of moderate to vigorous activity in school PE, falling far short of national recommendations.

A complete list of the participating investigators of the National Institute of Child Health and Human Development Study of Early Child Care and Youth Development Network appears below.

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