Correlation between bone mineral density and sarcopenia in US adults: a population-based study

Area of Science:

• Gerontology
• Bone and Mineral Metabolism
• Nutritional Science

Background:

• Aging is associated with changes in body composition, including bone loss, suggesting a link between muscle, bone, and lipid metabolism.
• Understanding the interplay between these components is crucial for addressing age-related health issues.

Purpose of the Study:

• To investigate the relationship between lumbar bone mineral density (BMD) and sarcopenia.
• To explore the association within the "muscle-bone-lipid" framework.

Main Methods:

• Cross-sectional analysis of NHANES 2011-2018 data from 8386 participants (ages 20-59).
• Lumbar BMD and appendicular skeletal muscle (ASM) measured by DXA; sarcopenia defined using ASM adjusted by BMI.
• Weighted multivariate and logistic regression analyses, including fitted smoothing curves and threshold effect analysis.

Main Results:

• A significant negative association was found between lumbar BMD and sarcopenia.
• Increased lumbar BMD was linked to a substantially reduced risk of sarcopenia (OR=0.07 per unit increase).
• The protective association was stronger in women with a BMI ≥ 25.

Conclusions:

• Lumbar BMD is inversely associated with sarcopenia in US adults.
• The findings highlight the importance of the "muscle-bone-lipid" dynamic in bone loss pathogenesis.
• Further research into this interplay may inform strategies for preventing age-related bone and muscle decline.