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 .
Sleep patterns and television viewing in relation to obesity and blood pressure: evidence from an adolescent Brazilian birth cohort
Background : Disruption of circadian rhythms has been associated with obesity in children and adolescents , and with hypertension in adults , in industrialized population s. Objective : We examined cross-sectional associations between sleep duration or television viewing and  obesity and blood pressure in Brazilian adolescents . Design : The sample consisted of 4452 adolescents aged 10–12 years participating in a prospect i ve birth cohort study in Pelotas , Brazil .  Sleep duration and television viewing were determined through question naires . Obesity was assessed using international cut-offs for body mass index ( BMI ) , and body fatness by skinfold thicknesses . Blood pressure was measured using a vali date d monitor . Results : Short sleep duration was associated with increased BMI , skinfolds , systolic blood pressure , activity levels and television viewing . Each hour of sleep reduced BMI by 0.16 kg/m2 ( s.e . 0.04 ) , and was associated with odds ratio for obesity of 0.86 ( s.e . 0.04 ) , both P<0.001 . Television viewing was associated with increased BMI and skinfolds , and increased blood pressure . The effects of sleep duration and television viewing on obesity were independent of one another . Their associations with blood pressure were mediated by body fatness . Conclusions : Both short sleep duration and increased television viewing were associated with greater body fatness , obesity and higher blood pressure , independently of physical activity level . These associations were independent of maternal BMI , identified in other studies as the strongest predictor of childhood obesity . Our study shows that behavioural factors associated with metabolic risk in industrialized population s exert similar deleterious effects in a population undergoing nutritional transition and suggest options for public health interventions
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 .