[The CHILT I project (Children's Health Interventional Trial). A multicomponent intervention to prevent physical inactivity and overweight in primary schools].

Child and juvenile obesity is increasing worldwide; therefore, effective preventive strategies are warranted. The stepwise project CHILT (Children's Health Interventional Trial) was initiated in 2000 and combines in its multicomponent school-based arm CHILT I health education and physical activity for primary school children to prevent physical inactivity and overweight. The effect on obesity and physical performance was studied in 12 primary schools (intervention schools, IS) compared with 5 control schools (CS). Anthropometric data were recorded. Physical performance was measured by a coordination test for children (the "Körperkoordinationstest für Kinder", KTK) and the 6-minute run. Anthropometric and motoric data of 436 children in IS (55.0% of the population) and 179 children in CS (62.8%) were available at baseline and at follow-up. No difference in the incidence of overweight was found between the IS and CS after 4 years of intervention. Remission of overweight was higher in IS (23.2% versus 19.2%), but not significant. The increase in BMI was significantly lower in IS, in which the program was regularly performed. There was an improvement in selected items of the KTK in IS. In particular, endurance performance tended to be higher at final examination. School-based preventive intervention seems to have a positive influence on physical motor skills and the remission of overweight. To optimize the effects, a consistent and quality assured implementation and the integration of the children's whole environment are warranted.