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 .
Improving aerobic power in primary school boys: a comparison of continuous and interval training.
The purpose of this study was to assess whether the magnitude of change in aerobic power was different in boys ( mean age 10.25 + /- 0.50 y ) who followed a high-intensity interval training protocol  , compared to those who followed a moderate-intensity continuous training protocol . Boys were assigned to either a control group ( n = 15 ) , a continuous training group ( n = 10 ) , or an interval training group ( n = 10 ) . They completed peak oxygen uptake tests at baseline and following an 8-week training period . The control group continued with normal activity habits , whilst the continuous training group followed a 20-minute steady-state cycle protocol at 80 - 85 % of the maximal heart rate , and the interval training group completed 30-s sprints on a cycle ergometer , interspersed with active rest periods . The two training protocol s were design ed to incur similar cardiovascular work over the 20 minutes of each training session . Significant increases ( p < 0.05 ) in peak oxygen uptake were noted for both the interval and continuous training groups . The interval training group showed marked pre- to post-increases in both peak oxygen pulse , oxygen pulse at the ventilatory threshold , and ventilatory threshold that were not apparent in the continuous group boys . It would appear that a high-intensity interval protocol confers a different training effect in comparison to continuous steady-state training in boys . Possible mechanisms that underpin these adaptations may include increased blood volume and a concomitant adjustment in stroke volume
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 .