title: Vitamin D supplementation during infancy is associated with higher bone mineral mass in prepubertal girls.
abstract: The objective of this study was to determine whether vitamin D supplementation of breast-fed infants during the first year of life is associated with greater bone mineral content and/or areal bone mineral density (aBMD) in later childhood. The design was a retrospective cohort study. One hundred and six healthy prepubertal Caucasian girls (median age, 8 yr; range, 7-9 yr) were classified as vitamin D supplemented or unsupplemented during the first year of life on the basis of a questionnaire sent to participating families and their pediatricians. Bone area (square centimeters) and bone mineral content (grams) were determined by dual energy x-ray absorptiometry at six skeletal sites. Vitamin D receptor (VDR) 3'-gene polymorphisms (BsmI) were also determined. The supplemented (n = 91) and unsupplemented (n = 15) groups were similar in terms of season of birth, growth in the first year of life, age, anthropometric parameters, and calcium intake at time of dual energy x-ray absorptiometry. The supplemented group had higher aBMD at the level of radial metaphysis (mean +/- SEM, 0.301+/-0.003 vs. 0.283+/-0.008; P = 0.03), femoral neck (0.638+/-0.007 vs. 0.584+/-0.021; P = 0.01), and femoral trochanter (0.508+/-0.006 vs. 0.474+/-0.016; P = 0.04). At the lumbar spine level aBMD values were similar (0.626+/-0.006 vs. 0.598+/-0.019; P = 0.1). In a multiple regression model taking into account the effects of vitamin D supplementation, height, and VDR genotype on aBMD (dependent variable), femoral neck aBMD remained higher by 0.045 g/cm2 in the supplemented group (P = 0.02). Vitamin D supplementation in infancy was found to be associated with increased aBMD at specific skeletal sites later in childhood in prepubertal Caucasian girls.
authors.affiliation: Department of Pediatrics, University Hospital, Geneva, Switzerland. samuel.zamora@hcuge.ch
authors.forename: S A
authors.initials: SA
authors.lastname: Zamora
authors.forename: R
authors.initials: R
authors.lastname: Rizzoli
authors.forename: D C
authors.initials: DC
authors.lastname: Belli
authors.forename: D O
authors.initials: DO
authors.lastname: Slosman
authors.forename: J P
authors.initials: JP
authors.lastname: Bonjour
mesh_terms: D015502:Absorptiometry, Photon; D015519:Bone Density; D001942:Breast Feeding; D002648:Child; D015331:Cohort Studies; D019587:Dietary Supplements; D005260:Female; D006801:Humans; D007223:Infant; D011110:Polymorphism, Genetic; D018167:Receptors, Calcitriol / Q000235:genetics; D012189:Retrospective Studies; D014807:Vitamin D / Q000008:administration & dosage*
chemical_list: D018167:Receptors, Calcitriol; D014807:Vitamin D