Physical activity, calcium intake, and bone mineral content in children in The Netherlands.

STUDY OBJECTIVE--To examine the relation between physical activity, calcium intake, and bone mineral content in children. DESIGN--Population based, cross sectional study. SETTING--Primary schools in Zoetermeer, The Netherlands. PARTICIPANTS--Altogether 1359 Dutch boys and girls, aged 7 to 11 years (response rate 88%). MEASUREMENTS--Bone mineral content was measured by quantitative roentgen microdensitometry of the midphalanx of the second digit at the diaphyseal and metaphyseal site. Maximal exercise testing, according to the Bruce treadmill protocol, was used to assess physical fitness. Habit... Mehr ...