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 .
Depressive symptoms and physical activity in adolescent girls.
PURPOSE To evaluate the relationship between depressive symptoms and physical activity in a geographically and ethnically diverse sample of sixth- grade adolescent girls . METHODS The Trial of Activity for Adolescent Girls ( TAAG ) baseline measurement included a r and om sample ( N = 1721 ) of sixth- grade girls in 36 schools at six field sites . Measurements were  accelerometry  and the 3-d Physical Activity Recall ( 3DPAR ) for  physical activity  , and the Center for Epidemiological Studies -Depression scale ( CES-D ) for depressive symptoms . RESULTS Girls with complete data ( N = 1397 ) , mean age 12 yr , had an average  CES-D score of 14.7 ( SD = 9.25 ) and engaged in an average of about 460 min of sedentary activity , < 24 min of moderate to vigorous physical activity ( MVPA ) , and < 6 min of vigorous physical activity ( VPA ) in an 18-h day . Thirty-minute segments of MVPA ranged in number from 3.9 to 1.2 , and METS for these segments ranged from > 3.0 to > 6.5 . Mixed-model regression indicated no relationship between depressive symptoms and physical activity ; however , a significant but modest inverse relationship between sedentary activity and depressive symptoms was observed . CONCLUSION A sufficient sample size , st and ardized procedures , and vali date d instruments characterized this study ; however , a relationship between depressive symptoms and physical activity was not observed for sixth- grade girls from diverse geographic locations . The average CES-D score was lower than is considered clinical ly meaningful for either adolescents or adults , and MET-minutes of sedentary activity were high . This combination of data may be different from other studies and could have contributed to the unexpected finding . This unexpected finding is informative , however , because it shows the need for additional research that includes a wider range of possible combinations of data , especially with young adolescent 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 .