Conclusions Multicomponent interventions which also include the use of st and ing desks may be an effective method for reducing  children 's sedentary time  in a school-based intervention .
Introduction Prolonged , uninterrupted periods of sedentary time may be associated with increased risk of Type II diabetes , cardiovascular disease and all-cause mortality even if the minimum recommended levels of daily physical activity are achieved .
It is reported that children spend approximately 80 % of their day engaged in sedentary behaviours .
Since children spend a large portion of their waking time at school , school-based interventions targeting excessive or interrupted periods of sedentary time have been investigated in a number of studies .
However , results of the effectiveness of studies to- date have been inconsistent .
Aim To conduct a systematic review to evaluate the effectiveness of school-based interventions design ed to reduce sedentary behaviour on objective ly measured sedentary time in children .
The validation of a novel activity monitor in the measurement of posture and motion during everyday activities
Background : Accurate measurement of physical activity patterns can be used to identify sedentary behaviour and may facilitate interventions aim ed at reducing inactivity . Objective : To evaluate the activPAL physical activity monitor as a measure of posture and motion in everyday activities using observational analysis as the criterion st and ard . Methods : Wearing three activPAL monitors , 10 healthy participants performed a range of r and omly assigned everyday tasks incorporating walking , st and ing and sitting . Each trial was captured on a digital camera and the recordings were synchronised with the activPAL . The time spent in different postures was visually classified and this was compared with the activPAL output . Results : Intraclass correlation coefficients ( ICC 2,1 ) for interdevice reliability ranged from 0.79 to 0.99 . Using the Bl and and Altman method , the mean percentage difference between the activPAL monitor and observation for total time spent sitting was 0.19 % ( limits of agreement −0.68 % to 1.06 % ) and for total time spent upright was −0.27 % ( limits of agreement −1.38 % to 0.84 % ) . The mean difference for total time spent st and ing was 1.4 % ( limits of agreement −6.2 % to 9.1 % ) and for total time spent walking was −2.0 % ( limits of agreement −16.1 % to 12.1 % ) . A second-by-second analysis between observer and monitor found an overall agreement of 95.9 % . Conclusion : The activPAL activity monitor is a valid and reliable measure of posture and motion during everyday physical activities
Conclusions Multicomponent interventions which also include the use of st and ing desks may be an effective method for reducing  children 's sedentary time  in a school-based intervention .
Introduction Prolonged , uninterrupted periods of sedentary time may be associated with increased risk of Type II diabetes , cardiovascular disease and all-cause mortality even if the minimum recommended levels of daily physical activity are achieved .
It is reported that children spend approximately 80 % of their day engaged in sedentary behaviours .
Since children spend a large portion of their waking time at school , school-based interventions targeting excessive or interrupted periods of sedentary time have been investigated in a number of studies .
However , results of the effectiveness of studies to- date have been inconsistent .
Aim To conduct a systematic review to evaluate the effectiveness of school-based interventions design ed to reduce sedentary behaviour on objective ly measured sedentary time in children .