• Aurélie Blaes, Nicola D Ridgers, Julien Aucouturier, Emmanuel Van Praagh, Serge Berthoin, and Georges Baquet.
• University of Lille Nord de France, UDSL, EA 4488 "Physical Activity, Muscle, Health", Faculty of Sport Sciences and Physical Education, 9 Rue de l'Université, 59790 Ronchin, France.
• Prev Med. 2013 Nov 1; 57 (5): 580-4.

ObjectivePlayground interventions offer an opportunity to enhance school recess physical activity. We aimed to assess the effects of playground marking on objectively measured school recess physical activity in French children.MethodsParticipants were four hundred and twenty children (6-11years old) from 4 primary schools in Nord-Pas de Calais, France. Children's physical activity (PA) was measured with a uniaxial accelerometer twice a day (morning and afternoon recess) during a 4-day school week in April and May 2009. Two experimental schools (EG) received a recess-based intervention (playground markings) and two others served as controls (CG). Percentage of time spent on the following intensities of physical activity during school recess was measured before and after intervention: sedentary (SED), light physical activity (LPA), moderate physical activity (MPA), vigorous physical activity (VPA), very high physical activity (VHPA) and moderate-to-vigorous physical activity (MVPA).ResultsAt baseline, school recess PA among children from CG was significantly (p<0.001) higher than that among EG children. No interaction was observed between the recess-based intervention and gender. After the intervention, the EG spent significantly (p<0.05) more time in MPA, VPA and MVPA with a concomitant significant decrease in SED (p<0.05) compared to baseline, while the PA in CG remained unchanged.ConclusionPainted playground markings had a positive short-term effect on school recess physical activity levels.© 2013.

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