To examine the relation between physical activity, calcium intake, and bone mineral content in children.
Population based, cross sectional study.
Primary schools in Zoetermeer, The Netherlands.
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.
Habitual physical activity was assessed by use of a questionnaire on physical activities.
Bone mineral content in boys was not linearly associated with physical fitness after adjustments for differences in height, body weight, chronological age, and skeletal age.
In girls a linear association was found at the metaphyseal site only.
When extreme groups were compared, bone mineral content was found to be higher in « high fitness children » than « low fitness children », with statistical significance reached in boys only.
This cross sectional study in children aged 7 to 11 years suggests that an increased bone mineral content is found only in those with a high level of physical activity.
This association is most pronounced in the more mature children.
No evidence was found for an association between daily calcium intake and bone mineral content in childhood.
Mots-clés Pascal : Système ostéoarticulaire, Elément minéral, Os, Exercice physique, Calcium, Enfant, Homme, Epidémiologie, Sexe, Pays Bas, Europe
Mots-clés Pascal anglais : Osteoarticular system, Inorganic element, Bone, Physical exercise, Calcium, Child, Human, Epidemiology, Sex, Netherlands, Europe
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 95-0424572
Code Inist : 002A23A. Création : 01/03/1996.