Bone mass accretion rates in pre- and early-pubertal South African black and white children in relation to habitual physical activity and dietary calcium intakes.

ABSTRACT:

Aim

To examine bone mass changes in 321 black and white South African children in relation to habitual physical activity (PA) levels and calcium intakes.

Methods

Children underwent two bone mass scans at ages nine and 10 years using dual X-Ray absorptiometry. PA levels and calcium intakes were assessed using questionnaires. Data were analyzed by regressing change in bone mineral content (BMC) and bone area (BA) from age nine to 10, against BA (for BMC), height and body weight. The residuals were saved and called residualized BMCGAIN and BAGAIN. Residualized values provide good indication of weight, height and BA-matched accumulation rates.

Results

White children had significantly higher PA levels and calcium intakes than black children. Most active white males had sig

SUBMITTER: McVeigh JA 

PROVIDER: S-EPMC2939975 | biostudies-literature | 2007 Jun

REPOSITORIES: biostudies-literature