title: Lactation history and bone mineral density among perimenopausal women.
abstract: To examine the relation between lactation and bone mineral density, we conducted a cross-sectional study among white, nonsmoking, perimenopausal women age 40-54. Three hundred fifty-two women completed a questionnaire covering medical and reproductive histories, physical activity, and diet. We measured the bone density of lumbar vertebrae 2-4 with dual photon absorptiometry, and the midradius and distal radius with single photon absorptiometry. Women with a history of lactation had 41 mg per cm2 higher lumbar bone mineral density than women with no lactation (95% confidence interval = 8-74 mg per cm2), controlling for parity, body mass, physical activity, and menopausal status. We found no important increase at mid- or distal radius.
authors.affiliation: Family Health International, Research Triangle Park, NC 27709.
authors.forename: P J
authors.initials: PJ
authors.lastname: Feldblum
authors.forename: J
authors.initials: J
authors.lastname: Zhang
authors.forename: L E
authors.initials: LE
authors.lastname: Rich
authors.forename: J A
authors.initials: JA
authors.lastname: Fortney
authors.forename: R V
authors.initials: RV
authors.lastname: Talmage
mesh_terms: D000328:Adult; D015519:Bone Density / Q000502:physiology*; D001842:Bone and Bones / Q000503:physiopathology; D002136:Calcium, Dietary / Q000008:administration & dosage; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007774:Lactation / Q000502:physiology*; D008875:Middle Aged; D009657:North Carolina / Q000453:epidemiology; D015663:Osteoporosis, Postmenopausal / Q000453:epidemiology / Q000503:physiopathology*; D010298:Parity; D012307:Risk Factors
chemical_list: D002136:Calcium, Dietary