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 .
Extensive television viewing and the development of attention and learning difficulties during adolescence.
OBJECTIVE To investigate the association of  television viewing  with educational and intellectual outcomes during adolescence and early adulthood . DESIGN Prospect i ve epidemiological study . SETTING Families participating in the Children in the Community Study , a prospect i ve longitudinal investigation , were interviewed at mean offspring ages 14 , 16 , and 22 years . PARTICIPANTS A community-based sample of 678 families from upstate New York . MAIN EXPOSURES Television viewing , attention difficulties , learning difficulties , and educational achievement during adolescence and early adulthood . MAIN OUTCOME MEASURES The Disorganizing Poverty Interview and age-appropriate versions of the Diagnostic Interview Schedule for Children . RESULTS Frequent television viewing during adolescence was associated with elevated risk for subsequent attention and learning difficulties after family characteristics and prior cognitive difficulties were controlled . Youths who watched 1 or more hours of television per day at mean age 14 years were at elevated risk for poor homework completion , negative attitudes toward school , poor grade s , and long-term academic failure . Youths who watched 3 or more hours of television per day were the most likely to experience these outcomes . In addition , youths who watched 3 or more hours of television per day were at elevated risk for subsequent attention problems and were the least likely to receive post secondary education . There was little evidence of bidirectionality in the association of television viewing with attention and learning difficulties . CONCLUSION Frequent television viewing during adolescence may be associated with risk for development of attention problems , learning difficulties , and adverse long-term educational outcomes
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 .