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. 1995 Jun;49(3):299–304. doi: 10.1136/jech.49.3.299

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

M F VandenBergh 1, S A DeMan 1, J C Witteman 1, A Hofman 1, W T Trouerbach 1, D E Grobbee 1
PMCID: PMC1060802  PMID: 7629468

Abstract

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. Habitual physical activity was assessed by use of a questionnaire on physical activities. Daily calcium intake from dairy products was estimated by use of a semiquantitative food frequency questionnaire. MAIN RESULTS--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" (upper decile) than "low fitness children" (lowest decile), with statistical significance reached in boys only. When analyses were performed in subgroups of skeletal age, a clear linear relation between physical fitness and bone mineral content was seen in the mature subgroup in both boys and girls. No linear association was found between habitual physical activity and bone mineral content, while the results in extreme groups (that is, upper versus lowest decile) and in subgroups of skeletal age were comparable to those on physical fitness in boys only. No association was found between daily calcium intake and bone mineral content in this age group. CONCLUSIONS--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.

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Selected References

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