Conclusion Physical activity and sedentary time were highly varied and inconsistent between studies ; therefore , it is difficult to determine preschoolers ’ true amount of physical activity and sedentary time during childcare hours .
Despite this variability , preschoolers were noted to participate in high rates of sedentary time in this setting .
The lack of homogeneity is an important finding in and of itself as it highlights the lack of consistency in measuring , processing , and reporting paediatric physical activity data
Background Many preschoolers spend a substantial portion of their day enrolled in centre-based childcare ; the amounts of physical activity and sedentary time accumulated in this environment are critical to preschoolers ’ ability to meet movement guidelines .
The purpose of this systematic review was to provide a comprehensive overview of the objective ly assessed physical activity  and  sedentary time  of preschoolers in centre-based childcare ( registration no. CRD42016033502 ) .
The effect of a cluster randomised control trial on objectively measured sedentary time and parental reports of time spent in sedentary activities in Belgian preschoolers: the ToyBox-study
Background In preschoolers , high levels of sedentary behaviour are associated with several adverse health outcomes . The purpose of this study is to report the effects of the ToyBox-intervention ( a European 24-week cluster r and omised controlled trial ) on sedentary behaviour  in preschoolers . Methods In Belgium , 859 preschoolers from 27 kindergartens ( 15 intervention and 12 control ) wore an accelerometer  to objective ly measure  their  sedentary time  and 1715 parents/caregivers completed a question naire to assess sedentary activities in which preschoolers participate at home . Main outcomes were objective ly measured sedentary time , time spent watching TV , using the computer and time spent in quiet play . Multilevel repeated measures analyses were conducted to take clustering into account . Intention to treat analysis was used to h and le missing data . Results A sample of 859 ( 29.5 % of all contacted children ) preschoolers ( 4.4 ± 0.6 years , 54.4 % boys ) provided valid accelerometer data at either baseline or follow-up and parents of 1715 ( 58.9 % of all contacted children ) preschoolers ( 4.4 ± 0.5 years , 52.5 % boys ) completed a question naire at either baseline or follow-up . No intervention effects were found on objective ly and subjectively measured total sedentary time in the total sample . However , some effects on objective ly and subjectively measured sedentary time were found in specific subgroups . Preschoolers from the intervention group from high SES kindergartens and preschoolers with high levels of sedentary time at baseline decreased their sedentary time , while preschoolers from the control group increased their sedentary time . Girls in the intervention group decreased their TV viewing time during weekend days ( -5.83 min/day ) , while girls ’ & TV viewing in the control group increased ( + 4.15 min/day ) . In low SES kindergartens , a smaller increase for computer time during weekend days was found in preschoolers in intervention kindergartens ( + 6.06 min/day ) than in control kindergartens ( + 12.49 min/day ) . Conclusion While some small positive effects were found in some sub-groups , the ToyBox-intervention had no effect on objective ly and subjectively measured sedentary time in the total sample . A longer period to implement the intervention and a more active involvement of parents/caregivers might enhance intervention effects . The ToyBox- study is registered with the clinical trials registry clinical trials.gov , ID : NCT02116296
Conclusion Physical activity and sedentary time were highly varied and inconsistent between studies ; therefore , it is difficult to determine preschoolers ’ true amount of physical activity and sedentary time during childcare hours .
Despite this variability , preschoolers were noted to participate in high rates of sedentary time in this setting .
The lack of homogeneity is an important finding in and of itself as it highlights the lack of consistency in measuring , processing , and reporting paediatric physical activity data
Background Many preschoolers spend a substantial portion of their day enrolled in centre-based childcare ; the amounts of physical activity and sedentary time accumulated in this environment are critical to preschoolers ’ ability to meet movement guidelines .
The purpose of this systematic review was to provide a comprehensive overview of the objective ly assessed physical activity  and  sedentary time  of preschoolers in centre-based childcare ( registration no. CRD42016033502 ) .