No significant associations between screen time with blood pressure and cholesterol were reported .
Sedentary behaviour appears to be associated with  adiposity in adolescents , irrespective of dietary intake .
Screen time , but not overall sedentary behaviour , is consistently related to cardiometabolic health in adolescents .
Because of the associations screen time has with dietary intake , diet may be an important factor in the screen time and health relationship ; however , evidence has not previously been synthesized .
Thus , the aim of this systematic review was to explore whether the associations between various sedentary behaviours and cardiometabolic risk markers are independent of dietary intake in adolescents .
Activity behaviors in schoolchildren and subsequent 5-yr change in blood pressure.
PURPOSE This study aim ed to establish whether time spent in sport-related physical activities and sedentary behaviors ( e.g. , TV viewing , videogame usage , and homework ) was prospect ively associated with change in blood pressure ( BP ) for 5 yr . METHODS Eight hundred and twenty-one students age 6 yr at baseline ( 397 girls and 424 boys ) were examined from 2003 - 2004 to 2009 - 2011 . Children completed detailed activity question naires . BP was measured using a st and ardized protocol . RESULTS After adjusting for age , ethnicity , parental education , parental history of hypertension , baseline height , BP , body mass index ( BMI ) , baseline time spent in corresponding activity behavior , and change in BMI , each hour per day spent in total screen time was associated with a 0.69 and 0.59 mm Hg increase in diastolic BP ( P = 0.01 ) and mean arterial BP ( P = 0.01 ) , respectively . In boys , each hour per day spent in TV viewing was associated with a concurrent 1.42-mm Hg increase in diastolic BP ( P = 0.04 ) during the 5 yr . Children engaging in low sport-related physical activities at baseline but who engaged in high levels of physical activity ( ≥ 60 min · d(-1 ) ) at follow-up ( n = 154 ) compared with those engaging in low sport-related physical activities at both examinations ( n = 305 ) demonstrated significantly lower mean arterial BP , 7.26 versus 9.61 mm Hg ( P = 0.04 ) . CONCLUSIONS Time spent in physical activity and screen time could influence BP measures during childhood
No significant associations between screen time with blood pressure and cholesterol were reported .
Sedentary behaviour appears to be associated with  adiposity in adolescents , irrespective of dietary intake .
Screen time , but not overall sedentary behaviour , is consistently related to cardiometabolic health in adolescents .
Because of the associations screen time has with dietary intake , diet may be an important factor in the screen time and health relationship ; however , evidence has not previously been synthesized .
Thus , the aim of this systematic review was to explore whether the associations between various sedentary behaviours and cardiometabolic risk markers are independent of dietary intake in adolescents .