title: Bone mineral and predictors of bone mass in white, Hispanic, and Asian early pubertal girls.
abstract: Differences in bone among racial/ethnic groups may be explained by differences in body size and shape. Previous studies have not completely explained differences among white, Asian, and Hispanic groups during growth. To determine racial/ethnic differences and predictors of bone mass in early pubertal girls, we measured bone mineral content (BMC) in white, Hispanic, and Asian sixth-grade girls across six states in the United States. We developed models for predicting BMC for the total-body, distal radius, total-hip, and lumbar spine for 748 subjects. For each of the bone sites, the corresponding area from dual-energy X-ray absorptiometry (DXA) was a strong predictor of BMC, with correlations ranging 0.78-0.98, confirming that larger subjects have more BMC. Anthropometric measures of bone area were nearly as effective as bone area from DXA at predicting BMC. For total-body, distal radius, lumbar spine, and total-hip BMC, racial/ethnic differences were explained by differences in bone area, sexual maturity, physical activity, and dairy calcium intake. Bone size explained most of the racial/ethnic differences in BMC, although behavioral indicators were also significant predictors of BMC.
authors.affiliation: Department of Foods and Nutrition, Purdue University, 700 W. State Street, West Lafayette, IN 47907-2059, USA. weavercm@purdue.edu
authors.forename: C M
authors.initials: CM
authors.lastname: Weaver
authors.forename: L D
authors.initials: LD
authors.lastname: McCabe
authors.forename: G P
authors.initials: GP
authors.lastname: McCabe
authors.forename: R
authors.initials: R
authors.lastname: Novotny
authors.forename: M
authors.initials: M
authors.lastname: Van Loan
authors.forename: S
authors.initials: S
authors.lastname: Going
authors.forename: V
authors.initials: V
authors.lastname: Matkovic
authors.forename: C
authors.initials: C
authors.lastname: Boushey
authors.forename: D A
authors.initials: DA
authors.lastname: Savaiano
mesh_terms: D015502:Absorptiometry, Photon; D000375:Aging / Q000502:physiology*; D000886:Anthropometry; D044466:Asian People; D001827:Body Height / Q000502:physiology; D015519:Bone Density / Q000502:physiology*; D001846:Bone Development / Q000502:physiology*; D002136:Calcium, Dietary / Q000378:metabolism; D002648:Child; D003430:Cross-Sectional Studies; D005260:Female; D048788:Growth and Development / Q000502:physiology; D006630:Hispanic or Latino; D006801:Humans; D009043:Motor Activity / Q000502:physiology; D011237:Predictive Value of Tests; D011627:Puberty / Q000502:physiology*; D044469:Racial Groups; D012863:Skeleton; D044465:White People
chemical_list: D002136:Calcium, Dietary