Based on 88 eligible observational studies , level of evidence grading and quantitative meta-analyses indicated that there is limited available evidence that the total volume or patterns of sedentary behaviour are associated with health in children and adolescents when accounting for moderate-intensity to vigorous-intensity physical activity or focusing on studies with low risk of bias .
Quality evidence from studies with robust design s and methods , objective measures of sitting , examining associations for various health outcomes , is needed to better underst and if the overall volume or patterns of sedentary behaviour are independent determinants of health in children and adolescents
Sedentary behaviour has emerged as a unique determinant of health in adults .
Studies in children and adolescents have been less consistent .
We review ed the evidence to determine if the total volume and patterns ( i.e. breaks and bouts ) of objective ly measured sedentary  behaviour  were associated with adverse health outcomes in young people , independent of moderate-intensity to vigorous-intensity physical activity .
Relationship between the intensity of physical activity, inactivity, cardiorespiratory fitness and body composition in 7–10-year-old Dublin children
Objective : To investigate the relationships between the time spent in specific intensities of activity and inactivity ,  cardiorespiratory fitness and body composition in children . Methods : A cross-sectional study was conducted in a r and om sample of schools . Height , weight and waist circumference were measured in 224 children aged 7–10 years . Cardiorespiratory fitness was estimated by the 20 m multistage running test , and physical activity was measured over 4 days by the RT3 ( a triaxial accelerometer ) . Time each day spent in moderate and vigorous intensities of activity was calculated . Results : Twelve schools agreed to participate in the study .  Body composition and fitness data were obtained for 224 children and activity data for 152 children . Boys were found to take part in about twice as much vigorous and hard activity as girls ( mean ( 95 % confidence interval ) 64.3 ( 53.2 to 75.4 ) min in boys compared with 37 ( 33.1 to 40.9 ) min in girls ; p<0.001 ) . In boys there was significant difference between those defined as normal , overweight and obese in the time spent in vigorous activity ( p<0.05 ) , but no such difference was found in girls . A significant negative correlation between waist circumference and time spent in vigorous activity ( r = –0.31 , p<0.05 ) was found in boys but not in girls . Time spent sedentary was positively correlated with waist circumference in boys ( r = 0.33 , p<0.01 ) but not in girls . In both boys and girls there were significant negative correlations between fitness and both body mass index ( r = –0.274 , p<0.001 ) and waist circumference ( boys : r = –0.503 , p<0.01 ; girls : r = –0.286 , p<0.01 ) . Conclusion : In boys , body composition was inversely related to fitness and to vigorous activity and was positively related to inactivity . In girls , body composition was related to fitness but not to specific components of physical activity
Based on 88 eligible observational studies , level of evidence grading and quantitative meta-analyses indicated that there is limited available evidence that the total volume or patterns of sedentary behaviour are associated with health in children and adolescents when accounting for moderate-intensity to vigorous-intensity physical activity or focusing on studies with low risk of bias .
Quality evidence from studies with robust design s and methods , objective measures of sitting , examining associations for various health outcomes , is needed to better underst and if the overall volume or patterns of sedentary behaviour are independent determinants of health in children and adolescents
Sedentary behaviour has emerged as a unique determinant of health in adults .
Studies in children and adolescents have been less consistent .
We review ed the evidence to determine if the total volume and patterns ( i.e. breaks and bouts ) of objective ly measured sedentary  behaviour  were associated with adverse health outcomes in young people , independent of moderate-intensity to vigorous-intensity physical activity .