Sedentary behaviour, especially prolonged uninterrupted sitting, may be bad for cardiometabolic health. Breaking up sitting time may be more effective for health promotion than reducing total sitting time. However, there are currently no studies available reporting intervention effects on breaking up children's sedentary time. In a study just published online in the journal Pediatric Exercise Science we report on a study in which we examined intervention effect on objectively measured number of breaks in sedentary time, number of sedentary bouts (≥10 mins) and total and average amount of time spent in those sedentary bouts among 10- to 12- year-old Belgian children. The total sample included 354 children aged 10-11 with valid ActiGraph accelerometer data at pre- and post-test. Only few and small intervention effects were found, namely on total time spent in sedentary bouts immediately after school hours and on average time spent in sedentary bouts before school hours and immediately after school hours in favour of children from intervention schools. Unexpectedly, girls from intervention schools decreased the number of breaks during school hours and increased the number of sedentary bouts on a weekend day, whereas girls in control schools showed an increase in number of breaks and a decrease in number of bouts. In conclusion, UP4FUN did not have a consistent or substantial effect on breaking up children's sedentary time and these data suggest that more intensive and longer lasting interventions are needed, if interrupting sitting time is to be further pursued.
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