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 .
The effects of increasing outdoor play time on physical activity in Latino preschool children.
OBJECTIVE A r and omized controlled pilot study to test the hypothesis that increasing preschool children 's  outdoor free play time increases their daily physical activity levels . METHODS Physical activity was assessed by accelerometers for four consecutive school days in thirty-two Latino children ( 3.6+/-0.5 years ) attending a preschool for low-income families . After two days of baseline physical activity assessment , participants were r and omly assigned to an intervention ( RECESS ; n = 17 ) or control ( CON ; n = 15 ) group . The RECESS group received two additional 30-minute periods of outdoor free play time per day for two days . The CON group followed their normal classroom schedule . Between group differences in physical activity variables were tested with a Wilcoxon rank-sum test . RESULTS There were no statistically significant differences between groups in changes from baseline in average total daily ( CON , 48.2+/-114.5 ; RECESS , 58.2+/-74.6 ) and during school day ( CON , 64.6+/-181.9 ; RECESS , 59.7+/-79.1 ) counts per minute , or total daily ( CON , 0.4+/-1.3 ; RECESS , 0.3+/-0.8 ) and during school day ( CON , 0.6+/-2.1 ; RECESS , 0.5+/-0.8 ) percent of time spent in moderate to vigorous physical activity . CONCLUSIONS Substantially increasing preschoolers '  outdoor free play time did not increase their physical activity levels
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 .