There is a large body of evidence from all study design s which suggests that decreasing any type of sedentary time is associated with lower health risk in youth aged 5 - 17 years .
In particular , the evidence suggests that daily TV viewing in excess of 2 hours is associated with reduced physical and psychosocial health , and that lowering sedentary time leads to reductions in BMI
Accumulating evidence suggests that , independent of physical activity levels , sedentary behaviours are associated with increased risk of cardio-metabolic disease , all-cause mortality , and a variety of physiological and psychological problems .
Therefore , the purpose of this systematic review is to determine the relationship between sedentary behaviour and health indicators in school-aged children and youth aged 5 - 17 years .
Weekend and weekday patterns of physical activity in overweight and normal-weight adolescent girls.
OBJECTIVE To describe the patterns ( specifically comparing weekdays and weekends classified by intensities ) of  physical activity ( PA ) measured by accelerometry in adolescent girls . RESEARCH METHODS AND PROCEDURES Healthy sixth grade girls ( n=1603 ) , 11 to 12 years old , were r and omly recruited from 36 schools participating in the Trial of Activity in Adolescent Girls . Age , ethnicity , socioeconomic status , weight , and height were taken .  PA patterns were measured for 6 days using accelerometry . RESULTS Adolescent girls spend most of their time in  sedentary  ( 52 % to 57 % of the day ) and  light activity ( 40 % to 45 % of the day ) on weekdays and weekends . In all girls , total PA  comprised 44.5 % of the day ( 41.7 % light , 2.2 % moderate , and 0.7 % vigorous ) with sedentary activity comprising 55.4 % .  Moderate-to-vigorous PA ( MVPA )  was higher ( p<0.001 ) on weekdays than weekends in all girls , but  MVPA  was lower in at-risk of overweight+overweight girls ( p<0.001 ) on both weekdays and weekends compared with normal-weight girls . DISCUSSION Adolescent girls are more active at moderate and vigorous intensities on weekdays than on weekends , and at-risk of overweight and those overweight spend less time engaging in  MVPA  than normal-weight girls
There is a large body of evidence from all study design s which suggests that decreasing any type of sedentary time is associated with lower health risk in youth aged 5 - 17 years .
In particular , the evidence suggests that daily TV viewing in excess of 2 hours is associated with reduced physical and psychosocial health , and that lowering sedentary time leads to reductions in BMI
Accumulating evidence suggests that , independent of physical activity levels , sedentary behaviours are associated with increased risk of cardio-metabolic disease , all-cause mortality , and a variety of physiological and psychological problems .
Therefore , the purpose of this systematic review is to determine the relationship between sedentary behaviour and health indicators in school-aged children and youth aged 5 - 17 years .