The Local and Systemic Interactions Between Muscle and Bone in Postmenopausal Korean Women
Despite many studies about local and systemic interactions between bone and muscle, the more dominant interaction remains unclear. We aimed to compare the association of skeletal muscle mass with bone mineral density (BMD) at the femur, which seemed more likely affected by local interaction, and the association of skeletal muscle mass with BMD at the lumbar spine (LS-BMD) and the trabecular bone score (TBS), which seemed more likely affected by systemic interaction. In 279 women, we measured the femoral neck BMD (FN-BMD), total hip BMD (TH-BMD), LS-BMD, and TBS. Appendicular skeletal muscle mass (ASM), lean mass (LM), and other LM (OLM; remaining LM excluding ASM) were measured using bioelectrical impedance analysis. ASM (β = 0.008–0.014, p < 0.001–0.014), OLM (β = 0.006–0.011, p < 0.001–0.044), and LM (β = 0.004–0.007, p < 0.001–0.020) were positively associated with FN-BMD and TH-BMD, but not with LS-BMD or TBS. The positive association of ASM, but not of OLM, was stronger than that of LM (p = 0.023). Odd ratios (ORs) with 95% confidence intervals (95% CIs) for osteoporosis were statistically significant for ASM (OR 0.74, 95% CI 0.59–0.93) and marginally significant for OLM (OR 0.80, 95% CI 0.64–1.01) in the femur, but not in the LS. The direct and indirect (through OLM) effects of ASM on BMD were 69.1–72.2% and 27.8–30.9%, respectively. In the conclusion, ASM was more positively associated with FN-BMD, but not with LS-BMD and TBS, than OLM. This suggests stronger effects of local interaction than systemic interaction between muscle and bone.
KeywordsBone Bone–muscle crosstalk Muscle Trabecular bone score
This study was supported by Grants from the Korea Health Technology R&D Project, Ministry of Health & Welfare, Republic of Korea (Project No. HI15C2792).
Compliance with Ethical Standards
Conflict of interest
MK Kwak, B-J Kim, JS Kim, SH Lee, and J-M Koh declare that they have no conflicts of interest.
Human and Animal Rights and Informed Consent
The study was approved by the institutional review board at Asan Medical Center (2018-0157), and all participants provided written informed consent.
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