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 .
Stage-matched minimal interventions to enhance physical activity in Chinese adolescents.
PURPOSE Interventions to improve physical activity ( PA )  might be successful when treatments are matched to the requirements of the recipients , in particular to their stage of change . This intervention study examines PA in Chinese high school students whose stage of change at the beginning of the study was identified . METHODS Two minimal interventions ( 1 hour ) were provided : re source communication and strategic planning . We assumed that preintenders would benefit in terms of PA frequency mainly from re source communication , and intenders would benefit from planning . Adolescents were assigned to an experimental and a control group . Moreover , they were divided according to stage ( preintender , intender , actor ) . In the experimental group , each stage group received interventions . The data were analyzed with repeated measures analyses of variance ( N = 534 ) . Stage groups and treatment ( re source communication , planning , and controls ) were chosen as between-subjects factors .  PA frequency was the dependent variable measured at two points in time 4 weeks apart ( pre-post measures ) . RESULTS Preintenders in the re source communication condition improved their activity levels , whereas intenders increased their PA not only in the planning but also in re source communication conditions . Actors maintained their activity independently of the treatment they received , which was in line with the hypotheses . CONCLUSIONS Matching PA interventions for adolescents to at least two stages of change might be a promising approach . Those who are not motivated to exercise benefit from re source -based messages , whereas those who have behavioral intentions benefit from planning
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 .