A simple assessment of physical activity is associated with obesity and motor fitness in pre-school children

Objective: Physical activity is an important determinant of energy balance. However, its impact on overweight/obesity has proved difficult to measure in pre-school children and few Studies have found significant associations. A set of simple questions was used to distinguish pre-school children with high and low physical activity, and the association of this classification with childhood overweight/obesity and performance in an established motor test was investigated. Design: Survey, cross-sectional. Setting and subjects: Weight and height were measured in 12 556 children taking part in the obligatory school entrance health examination 2004-5 and 2005-6 in three urban and three rural Bavarian regions. Their parents were asked to answer a questionnaire with a set of questions on physical activity. Results: The mean age of the children evaluated was 5.78 (SD 0.43) years, 6535 (52.1%) were boys. Physically active children were less likely to be overweight (OR = 0.786, 95% CI 0.687, 0.898) or obese (OR = 0.655, 95% CI 0.506, 0.849) and achieved 6.7 (95% CI 5.8, 7.7) % more jumps per 30 s than less active children in a motor test, adjusted for a number of potentially confounding variables. Conclusions: Classification of pre-school children as physically active or not, based on a small set of questions, revealed significant associations with overweight/obesity and a motor test. Once further validated, this classification might provide a valuable tool to assess the impact of physical activity on the risk of childhood overweight and obesity.