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Horm Metab Res 2001; 33(3): 170-174
DOI: 10.1055/s-2001-14931
Original Clinical

© Georg Thieme Verlag Stuttgart · New York

Bone Mineral Density is Inversely Related to Parathyroid Hormone in Adolescent Girls

D. Bonofiglio1 , M. Maggiolini1 , S. Catalano2 , S. Marsico2 , S. Aquila2 , S. Andò3
  • 1 Dept. of Pharmaco-Biology, University of Calabria, Rende (CS), Italy
  • 2 Health Centre, University of Calabria, Rende (CS), Italy
  • 3 Dept. of Cellular Biology, University of Calabria, Rende (CS), Italy
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Publikationsdatum:
31. Dezember 2001 (online)

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Preventive programs aimed at maximizing peak bone mass as a way of reducing the risk of osteoporotic fractures later in life should take into account the contribution of nutritional factors to bone mass accumulation in young age. The role of calcium and energy intakes on radial mineral density was investigated in 200 healthy girls (aged 11 - 15 yr) simultaneously evaluating serum changes of insulin-like growth factor-I (IGF-I), parathyroid hormone (PTH) and osteocalcin (OC). Dietary calcium and energy intakes were assessed by a 3-day food record method, bone mineral density (BMD) was performed at ultradistal (ud) and proximal (pr) radial sites using dual energy X-ray absorptiometry. Calcium consumption below the levels suggested by Dietary Reference Intakes in more than 80 % of population studied was not related to BMD, which in turn markedly increased in post-compared to premenarcheal girls. Interestingly, in a multiple regression analysis PTH was inversely related to BMD after adjustment for calcium intake, bone age and menarche. Serum IGF-I was positively associated to energy intakes and bone age in girls before menarche, who exhibited the highest values of OC. Our data highlighted the role of food habits in modulating some hormonal response that might influence bone mineral apposition during adolescent age. Low calcium consumption associated to enhanced PTH values, if persisting, could be responsible for reduced rate of gain in bone mineral density. Thus, to optimize bone mineralization during the critical period of rapid body growth adequate intakes of calcium and energy should be recommended.

Key words:

Bone Mineral Density - Calcium Intake - Energy Intake - Insulin-Like Growth Factor-I - Parathyroid Hormone

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Prof. S. Andò

Centro Sanitario - Università della Calabria

87036 Rende
Cosenza
Italy


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