title: BMI but Not Race Contributes to Vitamin D-Parathyroid Hormone Axis in Peripubertal Girls.
abstract: Currently, there is widespread interest in establishing 25-hydroxy vitamin D (25OHD) level preventing a secondary elevation in parathyroid hormone (PTH). The aim of this study was to identify the 25OHD nadir resulting in a rise of PTH and to determine if this inflection point is weight- or race-specific during growth and development in peripubertal girls. A total of 104 normal (n = 61) and overweight (n = 43) African American (AA) and European American (EA) girls, 5 to 14 years of age, were included. Though AAs had lower 25OHD levels, there was no difference in PTH compared with EAs. A 25OHD concentration of 27.2 ng/mL (P < .01) was indicated to increase PTH in normal-weight girls, although a statistically significant level was not established in overweight girls. No race difference in inflection point was observed. These data suggest a potential influence of weight status on the 25OHD-PTH inflection point in peripubertal girls. Accordingly, on determination of 25OHD level reflecting optimal health, consideration of weight status appears to be important during this critical period of growth and development.
authors.affiliation: Department of Nutrition Sciences (LJH, JRF, KC), Department of Pediatrics/Pediatric Endocrinology (AA), and the Department of Biostatistics (TMB, JRF), University of Alabama at Birmingham, Birmingham, AL; and the Division of Endocrinology, Diabetes & Lipids, Emory University School of Medicine, Atlanta, GA (JAA).
authors.forename: Lynae J
authors.initials: LJ
authors.lastname: Hanks
authors.affiliation: Department of Nutrition Sciences (LJH, JRF, KC), Department of Pediatrics/Pediatric Endocrinology (AA), and the Department of Biostatistics (TMB, JRF), University of Alabama at Birmingham, Birmingham, AL; and the Division of Endocrinology, Diabetes & Lipids, Emory University School of Medicine, Atlanta, GA (JAA).
authors.forename: Ambika
authors.initials: A
authors.lastname: Ashraf
authors.affiliation: Department of Nutrition Sciences (LJH, JRF, KC), Department of Pediatrics/Pediatric Endocrinology (AA), and the Department of Biostatistics (TMB, JRF), University of Alabama at Birmingham, Birmingham, AL; and the Division of Endocrinology, Diabetes & Lipids, Emory University School of Medicine, Atlanta, GA (JAA).
authors.forename: Jessica A
authors.initials: JA
authors.lastname: Alvarez
authors.affiliation: Department of Nutrition Sciences (LJH, JRF, KC), Department of Pediatrics/Pediatric Endocrinology (AA), and the Department of Biostatistics (TMB, JRF), University of Alabama at Birmingham, Birmingham, AL; and the Division of Endocrinology, Diabetes & Lipids, Emory University School of Medicine, Atlanta, GA (JAA).
authors.forename: T Mark
authors.initials: TM
authors.lastname: Beasley
authors.affiliation: Department of Nutrition Sciences (LJH, JRF, KC), Department of Pediatrics/Pediatric Endocrinology (AA), and the Department of Biostatistics (TMB, JRF), University of Alabama at Birmingham, Birmingham, AL; and the Division of Endocrinology, Diabetes & Lipids, Emory University School of Medicine, Atlanta, GA (JAA).
authors.forename: Jose R
authors.initials: JR
authors.lastname: Fernandez
authors.affiliation: Department of Nutrition Sciences (LJH, JRF, KC), Department of Pediatrics/Pediatric Endocrinology (AA), and the Department of Biostatistics (TMB, JRF), University of Alabama at Birmingham, Birmingham, AL; and the Division of Endocrinology, Diabetes & Lipids, Emory University School of Medicine, Atlanta, GA (JAA).
authors.forename: Krista
authors.initials: K
authors.lastname: Casazza
keywords: 25-hydroxy vitamin D; overweight; parathyroid hormone; reproductive maturation