Tracking and association of body weight and body fat in elementary school children
Klaus Greier1,2, Clemens Drenowatz3, Hannes Gatterer4, Herbert Riechelmann5
1Department of Sport Science, University Innsbruck, Innsbruck, Austria
2Division of Physical Education, Private University of Education (KPH-ES), Stams, Austria
3Division of Physical Education, University of Education Upper Austria, Linz, Austria
4Institute of Mountain Emergency Medicine, EURAC Research, Bolzano, Italy
5Department of Otolaryngology, Medical University of Innsbruck, Innsbruck, Austria
Methods: Out of six schools in Innsbruck, Austria, anthropometric assessments and BIA measurements were performed in 199 children starting elementary school in fall 2013. Annual follow-up measurements were performed by the same measurement team until 4th grade.
Results: Cross-sectional analyses revealed a significant moderate correlation between BMI and percent body fat (%BF) (r=0.61) and an AUC of 0.88 indicated high accuracy of BMI as an indicator for body fatness. There was also high tracking of BMI and %BF over the 4-year observation period (r ? 0.84). Follow-up measurements further showed that the association between BMI and %BF increased with age during the elementary school years (rgrade 4 = 0.78; AUCgrade 4 = 0.96).
Conclusions: Given the health problems associated with excess body fat an accessible and accurate assessment of body composition is warranted. The BMI provides a low-cost and easily administered surrogate measure of body fatness in elementary school children for initial screening. Children considered at risk, however, may require more elaborate assessments that directly measure fat mass and fat-free mass.
Keywords: body composition, obesity, overweight, youth