Maria Matar1, Laila Al-Shaar1, Joyce Maalouf1, Mona Nabulsi1, Asma Arabi1, Mahmoud Choucair1, Hani Tamim1, Ghada El-Hajj Fuleihan1. 1. Department of Internal Medicine (M.M., A.A., M.C., H.T., G.E.-H.F.), Scholars in HeAlth Research Program (L.A.-S.), Vascular Medicine Program (L.A.-S.), Calcium Metabolism and Osteoporosis Program, World Health Organization Collaborating Center for Metabolic Bone Disorders (J.M., A.A., G.E.-H.F.), and Department of Pediatrics and Adolescent Medicine (M.N.), American University of Beirut, 1107 2020 Beirut, Lebanon.
Abstract
BACKGROUND: Little is known about the changes in calciotropic hormones during puberty and their relationship to bone mass during this critical period for skeletal accretion. OBJECTIVES: Investigate changes in calciotropic hormones, IGF-1, body composition, and their associations with bone metabolism in adolescents. METHODS: Post hoc analyses were performed from data on 335 healthy school children, ages 10-17 years, with hypovitaminosis D who participated in a vitamin D randomized controlled trial. Baseline serum biochemistries; hormonal studies; densitometry at the spine, hip, and total body; and body composition were used. ANOVA and regression analyses were implemented to evaluate changes in variables of interest across pubertal stages, within and between genders. RESULTS:Bone mass and body composition parameters increased substantially across Tanner stages in both genders. Serum calcium, 1,25-dihydroxyvitamin D, and25-hydroxyvitamin D levels did not vary by Tanner stages in both genders. Conversely, serum phosphorus, alkaline phosphatase, IGF-1, PTH, and osteocalcin peaked for the most part at Tanner stage II in girls and stage III in boys. 1,25-Dihydroxyvitamin D correlations with bone mass were not consistent, whereas IGF-1 was the most robust correlate of bone mass at several skeletal sites in early Tanner stages in both genders (R = 0.3-0.6). CONCLUSION:Serum phosphorus, alkaline phosphatase, IGF-1, PTH, and osteocalcin, but not calcium or 1,25-dihydroxyvitamin D, increased significantly in early puberty, with gender difference except for PTH, peaking earlier in girls than in boys. IGF-1 is a robust predictor of bone mass, an effect mediated in large part by increments in lean mass.
RCT Entities:
BACKGROUND: Little is known about the changes in calciotropic hormones during puberty and their relationship to bone mass during this critical period for skeletal accretion. OBJECTIVES: Investigate changes in calciotropic hormones, IGF-1, body composition, and their associations with bone metabolism in adolescents. METHODS: Post hoc analyses were performed from data on 335 healthy school children, ages 10-17 years, with hypovitaminosis D who participated in a vitamin D randomized controlled trial. Baseline serum biochemistries; hormonal studies; densitometry at the spine, hip, and total body; and body composition were used. ANOVA and regression analyses were implemented to evaluate changes in variables of interest across pubertal stages, within and between genders. RESULTS: Bone mass and body composition parameters increased substantially across Tanner stages in both genders. Serum calcium, 1,25-dihydroxyvitamin D, and 25-hydroxyvitamin D levels did not vary by Tanner stages in both genders. Conversely, serum phosphorus, alkaline phosphatase, IGF-1, PTH, and osteocalcin peaked for the most part at Tanner stage II in girls and stage III in boys. 1,25-Dihydroxyvitamin D correlations with bone mass were not consistent, whereas IGF-1 was the most robust correlate of bone mass at several skeletal sites in early Tanner stages in both genders (R = 0.3-0.6). CONCLUSION: Serum phosphorus, alkaline phosphatase, IGF-1, PTH, and osteocalcin, but not calcium or 1,25-dihydroxyvitamin D, increased significantly in early puberty, with gender difference except for PTH, peaking earlier in girls than in boys. IGF-1 is a robust predictor of bone mass, an effect mediated in large part by increments in lean mass.
Authors: Christian Trummer; Verena Schwetz; Marlene Pandis; Martin R Grübler; Nicolas Verheyen; Martin Gaksch; Armin Zittermann; Winfried März; Felix Aberer; Angelika Lang; Claudia Friedl; Andreas Tomaschitz; Barbara Obermayer-Pietsch; Thomas R Pieber; Stefan Pilz; Gerlies Treiber Journal: Nutrients Date: 2017-06-17 Impact factor: 5.717