Abstract
Summary
Associations of adiposity indices with bone mineral density (BMD) and bone turnover markers were evaluated in Chinese participants. Body mass index, fat mass, and lean mass are positively related to BMD in both genders. Subcutaneous fat area was proved to be negatively associated with BMD and positively correlated with osteocalcin in postmenopausal females.
Introduction
Obesity is highly associated with osteoporosis, but the effect of adipose tissue on bone is contradictory. Our study aimed to assess the associations of adiposity indices with bone mineral density (BMD) and bone turnover markers (BTMs) in the Chinese population.
Methods
Our study recruited 5215 participants from the Shanghai area, evaluated related anthropometric and biochemical traits in all participants, tested serum BTMs, calculated fat distribution using magnetic resonance imaging (MRI) images and image analysis software, and tested BMD with dual-energy X-ray absorptiometry.
Results
When controlled for age, all adiposity indices were positively correlated with BMD of all sites for both genders. As for the stepwise regression analysis, body mass index (BMI), fat mass, and lean mass were protective for BMD in both genders. However, subcutaneous fat area (SFA) was detrimental for BMD of the L1–4 and femoral neck (β ± SE −0.0742 ± 0.0174; p = 2.11E−05; β ± SE −0.0612 ± 0.0147; p = 3.07E−05). Adiposity indices showed a negative correlation with BTMs adjusting for age, especially with osteocalcin. In the stepwise regression analysis, fat mass was negatively correlated with osteocalcin (β ± SE −8.8712 ± 1.4902; p = 4.17E−09) and lean mass showed a negative correlation with N-terminal procollagen of type I collagen (PINP) for males (β ± SE −0.3169 ± 0.0917; p = 0.0006). In females, BMI and visceral fat area (VFA) were all negatively associated with osteocalcin (β ± SE −0.4423 ± 0.0663; p = 2.85E−11; β ± SE −7.1982 ± 1.1094; p = 9.95E−11), while SFA showed a positive correlation with osteocalcin (β ± SE: 5.5993 ± 1.1753; p = 1.98E−06).
Conclusion
BMI, fat mass, and lean mass are proved to be beneficial for BMD in both males and postmenopausal females. SFA is negatively associated with BMD and positively correlated with osteocalcin in postmenopausal females.
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Acknowledgments
This work was supported by grants from the National 863 Program (2015AA020110), National Key Research and Development Project (2016YFC1304902), Drug Innovation Program of the National Science and Technology Project (2011ZX09307-001-02), Shanghai Young Doctor Training and Funding Program, Shanghai Jiao Tong Medical/Engineering Foundation (YG2014MS18), Shanghai Municipal Education Commission–Gaofeng Clinical Medicine Grant Support (20152527), National Program for Support of Top-notch Young Professional, Shanghai Health and Family Planning Commission (2013ZYJB1001), Innovation Foundation of Translational Medicine of Shanghai Jiao Tong University School of Medicine (15ZH4006), Shanghai SJTUSM Biobank, and Shanghai Hospital Development Center (SHDC12013115). We acknowledge the assistance of the nursing and medical staff at the Shanghai Clinical Center for Diabetes. We gratefully appreciate all of the participants in this research.
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Wang, J., Yan, D., Hou, X. et al. Association of adiposity indices with bone density and bone turnover in the Chinese population. Osteoporos Int 28, 2645–2652 (2017). https://doi.org/10.1007/s00198-017-4081-5
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DOI: https://doi.org/10.1007/s00198-017-4081-5