Physical activity to prevent obesity in young children: cluster randomised controlled trial

Objective To assess whether a physical activity intervention reduces body mass index in young children. Design Cluster randomised controlled single blinded trial over 12 months. Setting Thirty six nurseries m Glasgow, Scotland. Participants 545 children in their preschool year, mean age 4.2 years (SD 0.2) at baseline. Intervention Enhanced physical activity programme in nursery (three 30 minute sessions a week over 24 weeks) plus home based health education aimed at increasing physical activity through play and reducing sedentary behaviour. Main outcome measure Body mass index, expressed as a standard deviation score relative to UK 1990 reference data. Secondary measures were objectively measured physical activity and sedentary behaviour; fundamental movement skills; and evaluation of tire process. Results Group allocation had no significant effect on the primary outcome measure at six and 12 months or on measures of physical activity and sedentary behaviour by accelerometry. Children in the intervention group had significantly higher performance in movement: Skills tests than control children at six month follow-up (P = 0.0027; 95% confidence interval 0.3 to 1.3) after adjustment for sex and baseline performance. Conclusions Physical activity can significantly improve motor skills but did not reduce body mass index in young children in this trial.