There was some evidence that school-based physical activity interventions had a positive impact on four of the nine outcome measures .
Specifically positive effects were observed for duration of physical activity , television viewing , VO2 max , and blood cholesterol .
Generally , school-based interventions had little effect on physical activity rates , systolic and diastolic blood pressure , BMI , and pulse rate .
At a minimum , a combination of printed educational material s and changes to the school curriculum that promote physical activity result ed in positive effects .
Few changes in outcomes were observed in this up date with the exception of blood cholesterol and physical activity rates .
For example blood cholesterol was no longer positively impacted upon by school-based physical activity interventions .
The evidence suggests the ongoing implementation of school-based physical activity interventions at this time , given the positive effects on behavior and one physical health status measure .
BACKGROUND The World Health Organization ( WHO ) estimates that 1.9 million deaths worldwide are attributable to physical inactivity and at least 2.6 million deaths are a result of being overweight or obese .
In addition , WHO estimates that physical inactivity causes 10 % to 16 % of cases each of breast cancer , colon , and rectal cancers as well as type 2 diabetes , and 22 % of coronary heart disease and the burden of these and other chronic diseases has rapidly increased in recent decades .
OBJECTIVES The purpose of this systematic review was to summarize the evidence of the effectiveness of school-based interventions in promoting physical activity and fitness in children and adolescents .
School-based randomized controlled trial of a physical activity intervention among adolescents.
PURPOSE To evaluate the effects of a  middle school physical activity intervention , new in combining an environmental and computer tailored component ; and to evaluate the effects of parental involvement . METHODS A clustered r and omized controlled design was used . A r and om sample of 15 schools with 7th and 8th grade rs was r and omly assigned to one of three conditions : ( a ) intervention with parental support , ( b ) intervention alone , and ( c ) control group . The intervention was new in combining environmental strategies with computer-tailored feedback to increase levels of moderate to vigorous physical activity .  The intervention was implemented by the school staff . Physical activity was measured through a question naire in the total sample and with accelerometers in a sub sample of adolescents . RESULTS The intervention with parental support led to an increase in self-reported school-related physical activity of , on average , 6.4 minutes per day ( p < or = .05 , d = .40 ) . Physical activity of light intensity measured with accelerometers decreased with , on average , 36 minutes per day as a result of the intervention with parental support ( p < or = .05 , d = .54 ) . Physical activity of moderate to vigorous intensity measured with accelerometers significantly increased with on average 4 minutes per day in the intervention group with parental support , while it decreased with almost 7 minutes per day in the control group ( p < or = .05 , d = .46 ) . CONCLUSIONS The physical activity intervention , implemented by the school staff , result ed in enhanced physical activity behaviors in both middle school boys and girls . The combination of environmental approaches with computer-tailored interventions seemed promising
There was some evidence that school-based physical activity interventions had a positive impact on four of the nine outcome measures .
Specifically positive effects were observed for duration of physical activity , television viewing , VO2 max , and blood cholesterol .
Generally , school-based interventions had little effect on physical activity rates , systolic and diastolic blood pressure , BMI , and pulse rate .
At a minimum , a combination of printed educational material s and changes to the school curriculum that promote physical activity result ed in positive effects .
Few changes in outcomes were observed in this up date with the exception of blood cholesterol and physical activity rates .
For example blood cholesterol was no longer positively impacted upon by school-based physical activity interventions .
The evidence suggests the ongoing implementation of school-based physical activity interventions at this time , given the positive effects on behavior and one physical health status measure .
BACKGROUND The World Health Organization ( WHO ) estimates that 1.9 million deaths worldwide are attributable to physical inactivity and at least 2.6 million deaths are a result of being overweight or obese .
In addition , WHO estimates that physical inactivity causes 10 % to 16 % of cases each of breast cancer , colon , and rectal cancers as well as type 2 diabetes , and 22 % of coronary heart disease and the burden of these and other chronic diseases has rapidly increased in recent decades .
OBJECTIVES The purpose of this systematic review was to summarize the evidence of the effectiveness of school-based interventions in promoting physical activity and fitness in children and adolescents .