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 .
Recruiting a diverse group of middle school girls into the trial of activity for adolescent girls.
BACKGROUND School-based study recruitment efforts are both time consuming and challenging . This paper highlights the recruitment strategies employed by the national , multisite Trial of Activity for Adolescent Girls  ( TAAG ) , a study design ed to measure the effectiveness of an intervention to reduce the decline of physical activity levels among middle school-aged girls . TAAG provided a unique opportunity to recruit large cohorts of r and omly sample d girls within 36 diverse middle schools across the United States . METHODS Key elements of the formative planning , coordination , and design of TAAG 's recruitment efforts included flexibility , tailoring , and the use of incentives . Various barriers , including a natural disaster , political tension , and district regulations , were encountered throughout the recruitment process , but coordinated strategies and frequent communication between the 6 TAAG sites were helpful in tailoring the recruitment process at the 36 intervention and control schools . RESULTS Progressively refined recruitment strategies and specific attention to the target audience of middle school girls result ed in overall study recruitment rates of 80 % , 85 % , and 89 % , for the baseline , posttest , and follow-up period , respectively . DISCUSSION The steady increase in recruitment rates over time is attributed to an emphasis on successful strategies and a willingness to modify less successful methods . Open and consistent communication , an increasingly coordinated recruitment strategy , interactive recruitment presentations , and participant incentives result ed in an effective recruitment campaign
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 .