Relationship Between Hormonal Variables and Bone Mineral Density, Muscle Force, and Fat Mass in Peripubertal Girls

AUTHORS

Ivana Zofkova 1 , * , Veronika Cirmanova 2 , Petr Kasalicky 2 , Vera Lanska 2 , Vaclav Vyskocil 3 , Petr Matucha 2 , Milan Bayer 2

1 Institute of Endocrinology, [email protected], Czech Republic

2 Institute of Endocrinology, Czech Republic

3 Centrum of Osteology, Medical Faculty, Charles University, Czech Republic

How to Cite: Zofkova I, Cirmanova V, Kasalicky P, Lanska V, Vyskocil V, et al. Relationship Between Hormonal Variables and Bone Mineral Density, Muscle Force, and Fat Mass in Peripubertal Girls, Int J Endocrinol Metab. Online ahead of Print ; 9(3):391-396. doi: 10.5812/Kowsar.1726913X.2583.

ARTICLE INFORMATION

International Journal of Endocrinology and Metabolism: 9 (3); 391-396
Article Type: Original Article
Received: June 30, 2011
Accepted: March 28, 2011
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Abstract

Background: The muscle-bone unit represents an evolutionary system, in which both of its components are under the common control of the insulin-like growth factor I (IGF-I), sex hormones, and vitamin D. The mutual interactions between these hormones maintain integrity, growth and maturation of pubertal bone mass. Thus, insufficiency of any of these hormones will negatively influence development of the skeleton during puberty.
Objectives: The aim of the study as to analyse the correlation between muscle mass, total bone mineral content (BMC), bone mineral density (BMD) of the lumbar spine (BMD L1-L4), and serum or urine hormones.
Materials and Methods: Total BMC (g) and areal BMD L1-L4 (g/cm2 and Z-score) as well as muscle mass and fat mass (g) were assessed by means of dual-energy X-ray absorptiometry (DXA). The Z-score is the number of standard deviations a patient´s BMD which differs from the average BMD of their age, sex, and ethnicity. This Parameter is used in children. Muscle force (N) was measured using a dynamometer.
Results: The simple correlations showed strong positive associations between BMC or BMD L1-L4 (g/cm2) and serum phosphate, estradiol, insulin-like growth factor (IGF-I), leptin and fat masses, and muscle force (P < 0.001 for all parameters). Positive correlations were also observed between BMD and serum phosphate (P < 0.01), IGF-I (P < 0.01), estradiol (P < 0.001), leptin (P < 0.01), fat and lean mass (P < 0.001 and P < 0.001, respectively) and muscle force (P < 0.001). The partial correlations, after eliminating the impact of height, Tanner stage, and physical activity level, confirmed positive relationships between either BMC or BMD L1-L4 and lean mass (P < 0.001 and P < 0.001, respectively) and fat mass (P < 0.001 for BMC and BMD). Furthermore, a positive relationship was observed between serum leptin and both BMC and BMD (Z score) (P < 0.05 and P < 0.05, respectively). After removing the effects of height, Tanner stage, and physical activity, positive associations were observed between lean mass and IGF-I (P < 0.01), leptin levels (P < 0.05), and muscle force (P < 0.01).
Conclusions: On the basis of the study results, it can be expected that low values of lean or fat mass, and insufficient production of IGF-I or leptin, could negatively influence bone development in pubertal girls.


  • Implication for health policy/practice/research/medical education:
    Monitoring of bone mineral density together with muscle indices and hormonal parameters in pubertal girls could prevent development of osteoporosis in women.
  • Please cite this paper as:
    Zofkova I, Cirmanova V, Kasalichy P, Lanska V, Vyskocil V, Matucha P, et al . Relationship Between Hormonal Variables and Bone Mineral Density, Muscle Force, and Fat Mass in Peripubertal Girls. Int J Endocrinol Metab. 2011;9(3): 391-6. DOI: 10.5812/Kowsar.1726913X.2583

Copyright © 2011 Kowsar M. P. Co. All rights reserved.


Keywords

Puberty Insulin-Like Growth Factor I Leptin Estrogens Serotonin

© 0, International Journal of Endocrinology and Metabolism. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/) which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited.

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