J Korean Med Sci.  2014 Jul;29(7):995-1000. 10.3346/jkms.2014.29.7.995.

The Association between the Low Muscle Mass and Osteoporosis in Elderly Korean People

• Kim S
• Won CW
• Kim BS
• Choi HR
• Moon MY

• KMID: 1789961
• DOI: http://doi.org/10.3346/jkms.2014.29.7.995

Abstract

The purpose of this study was to predict osteoporosis risk as decreasing muscle mass and to declare the cut-off value of low muscle mass in an elderly Korean population. This study was based on data from the 2008-2010 Korea National Health and Nutritional Examination Surveys (KNHANES). The subjects included 1,308 men and 1,171 women over 65 yr. Bone mineral density (BMD) and appendicular skeletal muscle (ASM) were measured by dual energy X-ray absorptiometry (DXA), and appendicular skeletal muscle was adjusted by height as a marker of sarcopenia. After confirming the correlation between low muscle mass and BMD, the best cut-off value of muscle mass to estimate osteoporosis was suggested through the receiver operating characteristic (ROC) curve. For both men and women, BMD correlated positively with low muscle mass when ASM/Ht2 was used as a marker for sarcopenia. The ROC curve showed that ASM/Ht2 was the best marker for osteoporosis at a cut-off value of 6.85 kg/m2 for men and 5.96 kg/m2 for women. When these cut-off values were used to determine sarcopenia, the risk of osteoporosis increased 4.14 times in men and 1.88 times in women. In particular, men (OR 2.12) with sarcopenia were more greatly affected than women (OR 1.15), even after adjusting for osteoporosis risk factors. In elderly Korean people, sarcopenia is positively correlated with BMD and there is a strong correlation between sarcopenia and osteoporosis with risk of bone fracture.

Keyword

Osteoporosis; Sarcopenia; Korea; KNHANES; Elderly Population

MeSH Terms

Absorptiometry, Photon
Aged
Aged, 80 and over
Area Under Curve
Asian Continental Ancestry Group
Body Mass Index
Bone Density
Female
Humans
Male
Muscle, Skeletal/*pathology/radiography
Nutrition Surveys
Odds Ratio
Osteoporosis/*diagnosis/etiology
ROC Curve
Republic of Korea
Risk Factors
Sarcopenia/physiopathology

Figure

• 

  Fig. 1 Receiver operating characteristic (ROC) curve of sarcopenia reflecting osteoporosis in Korean Elderly. The cut-off value of ASM/Ht2 was (A) 6.85 kg/m2 in men (area under the curve = 0.705; 95% CI, 0.679-0.730; P < 0.001 sensitivity 66.9%, specificity 66%), (B) 5.96 kg/m2 in women (area under the curve = 0.598; 95% CI, 0.569-0.627; P < 0.001 sensitivity 62%, specificity 53.5%).

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