Results Physical activity was associated with numerous health benefits .
The dose-response relations observed in observational studies indicate that the more physical activity , the greater the health benefit .
Results from experimental studies indicate that even modest amounts of physical activity can have health benefits in high-risk youngsters ( e.g. , obese ) .
Vigorous intensity activities may provide even greater benefit .
Aerobic-based activities had the greatest health benefit , other than for bone health , in which case high-impact weight bearing activities were required .
Some of the health benefits can be achieved through an average of 30 minutes per day . [
Level 2 , Grade A ] .
Background The purpose was to : 1 ) perform a systematic review of studies examining the relation between physical activity , fitness , and health in school-aged children and youth , and 2 ) make recommendations based on the findings .
Exercise training and cardiovascular risk factors in type 1 diabetic adolescent girls.
Sixteen postmenarcheal Type 1 diabetic adolescent girls were r and omized into training ( involving aerobic and strength exercises ) and nontraining groups .  Body composition ( skinfold thickness ) , aerobic fitness ( PWC170 ) , plasma lipids , serum apolipoproteins , lipoprotein(a ) , leptin , and adiponectin were assessed before and after the 6-month period . After the 6-month period , fat mass and leptin increased significantly in the nontraining group but not in the training group . Conversely , in the latter group , fat-free mass increased ( P < .01 ) . Moreover , PWC170 improved and apolipoproteinB : apolipoproteinA-1 ratio decreased with physical training ( P < .05 ) . Thus , physical training reduces cardiovascular risks and the increase of insulin resistance risk factors in diabetic adolescent girls
Results Physical activity was associated with numerous health benefits .
The dose-response relations observed in observational studies indicate that the more physical activity , the greater the health benefit .
Results from experimental studies indicate that even modest amounts of physical activity can have health benefits in high-risk youngsters ( e.g. , obese ) .
Vigorous intensity activities may provide even greater benefit .
Aerobic-based activities had the greatest health benefit , other than for bone health , in which case high-impact weight bearing activities were required .
Some of the health benefits can be achieved through an average of 30 minutes per day . [
Level 2 , Grade A ] .
Background The purpose was to : 1 ) perform a systematic review of studies examining the relation between physical activity , fitness , and health in school-aged children and youth , and 2 ) make recommendations based on the findings .