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 .
Criterion and Concurrent Validity of the activPAL™ Professional Physical Activity Monitor in Adolescent Females
Background The activPAL has been identified as an accurate and reliable measure of sedentary behaviour . However , only limited information is available on the accuracy of the activPAL activity count function as a measure of physical activity , while no unit calibration of the activPAL has been completed to date . This study aim ed to investigate the criterion validity of the activPAL , examine the concurrent validity of the activPAL , and perform and vali date a value calibration of the activPAL in an adolescent female population . The performance of the activPAL in estimating posture was also compared with sedentary thresholds used with the ActiGraph accelerometer . Method ologies Thirty adolescent females ( 15 developmental ; 15 cross-validation ) aged 15–18 years performed 5 activities while wearing the activPAL , ActiGraph GT3X , and the Cosmed K4B2 . A r and om coefficient statistics model examined the relationship between metabolic equivalent ( MET ) values and activPAL counts . Receiver operating characteristic analysis was used to determine activity thresholds and for cross-validation . The r and om coefficient statistics model showed a concordance correlation coefficient of 0.93 ( st and ard error of the estimate = 1.13 ) . An optimal moderate threshold of 2997 was determined using mixed regression , while an optimal vigorous threshold of 8229 was determined using receiver operating statistics . The activPAL count function demonstrated very high concurrent validity ( r = 0.96 , p<0.01 ) with the ActiGraph count function . Levels of agreement for sitting , st and ing , and stepping between direct observation and the activPAL and ActiGraph were 100 % , 98.1 % , 99.2 % and 100 % , 0 % , 100 % , respectively . Conclusions These findings suggest that the activPAL is a valid , objective measurement tool that can be used for both the measurement of physical activity and sedentary behaviours in an adolescent female population
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 .