Epidemiology and Health

Original Articles

Mediating effect of lower extremity muscle on the relationship between obesity and osteoarthritis in middle-aged and elderly women in Korea: based on the 2009-2011 Korea National Health and Nutrition Examination Survey: Minjun Kim, Joonwoong Kim, Inhwan Lee; Epidemiol Health. 2024;46:e2024027. Published online February 2, 2024; DOI: https://doi.org/10.4178/epih.e2024027

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Abstract Summary PDF: Abstract
OBJECTIVES
This study investigated whether the lower extremity muscle mass index (LMI) mediates the relationship between general obesity, central obesity, and knee osteoarthritis in middle-aged and elderly women in Korea.
METHODS
Data of 2,843 women aged ≥50 years were collected from the Korean National Health and Nutrition Examination Survey conducted between 2009 and 2011. General obesity and central obesity were evaluated based on body mass index (BMI) and waist circumference (WC), calculated through anthropometric measurements and body composition assessments. LMI was calculated by dividing the muscle mass in both legs—measured using the dual-energy X-ray absorptiometry—by body weight. Knee osteoarthritis was defined as a Kellgren-Lawrence scale (KL) grade of ≥2 as assessed through radiographic images.
RESULTS
Knee osteoarthritis prevalence, indicated by KL grades, was significantly higher in the general obesity and central obesity groups compared to the normal group, and conversely, lower with varying LMI levels. Using mediation analysis with bootstrapping and adjusting for covariates, we found that LMI mediated the relationship between BMI and KL (β, 0.005; 95% confidence interval [CI], 0.000 to 0.010) and WC and KL grade (β, 0.002; 95% CI, 0.001 to 0.003), explaining 4.8% and 6.7% of the total effects of BMI and WC on KL grade, respectively.
CONCLUSIONS
The study suggested that LMI partially mediates the link between general obesity and/or central obesity and knee osteoarthritis, proposing that a higher proportion of lower limb muscle mass relative to body weight can alleviate the increased risk of knee osteoarthritis caused by obesity.; Summary

Korean summary
본 연구는 한국의 50세 이상 여성들을 대상으로 비만 및 복부비만과 무릎골관절염의 관계에 대한 다리근육비율의 매개 효과를 분석한 결과, 다리근육비율은 비만의 진단하는 사용되는 체질량지수, 복부비만의 진단에 사용되는 허리둘레와 무릎 골관절염의 진단에 사용되는 KL등급의 관계를 부분적으로 매개하는 것으로 나타났다. 이러한 결과는 다리근육의 강화가 비만 및 복부비만으로 인한 무릎골관절염의 위험을 완화할 수 있음을 시사하며, 건강한 생활습관과 규칙적인 근력운동의 병행을 통해 다리 근육을 강화하는 것이 무릎 골관절염의 예방을 위한 전략으로 권장되어야 함을 시사한다.

Association of appendicular skeletal muscle mass with carotid intima-media thickness according to body mass index in Korean adults: Ji Eun Heo, Hyeon Chang Kim, Jee-Seon Shim, Bo Mi Song, Hye Yoon Bae, Ho Jae Lee, Il Suh; Epidemiol Health. 2018;40:e2018049. Published online October 7, 2018; DOI: https://doi.org/10.4178/epih.e2018049

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15 Web of Science
14 Crossref

Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
The combined effects of obesity and appendicular skeletal muscle (ASM) on atherosclerosis, especially in middleaged populations, remain poorly understood. This cross-sectional study investigated the effects of ASM on carotid intima-media thickness (IMT) according to body mass index (BMI) in middle-aged Korean adults.

METHODS

Herein, 595 men and 1,274 women aged 30-64 years completed questionnaires and underwent health examinations as part of the Cardiovascular and Metabolic Disease Etiology Research Center cohort. ASM was measured via bioelectrical impedance analysis and adjusted for weight (ASM/Wt). IMT was assessed using B-mode ultrasonography; highest quartile of IMT was defined as gender-specific top quartile of the IMT values. Higher BMIs was defined as a BMI over 25.0 kg/m2 .

RESULTS

Compared to the highest ASM/Wt quartile, the lowest ASM/Wt quartile was significantly associated with highest quartile of IMT in men with lower BMIs (adjusted odds ratio [aOR], 2.78; 95% confidence interval [CI], 1.09 to 7.13), but not in those with higher BMIs (aOR, 0.59; 95% CI, 0.24 to 1.91). In women, there was no significant association of low skeletal muscle mass with highest quartile of IMT, regardless of BMI.

CONCLUSIONS

Low appendicular skeletal muscle mass is associated with carotid arterial wall thickening in men with lower BMIs, but not in men with higher BMIs. Our findings suggest that the risk of atherosclerosis may be low in middle-aged Korean men with appropriate body weight and skeletal muscle mass maintenance.

Summary

Korean summary
한국 중년 성인을 대상으로 사지근육양과 죽상경화증(경동맥 내중막 두께≥75 percentile)의 관련성을 체질량지수(≥25, <25 kg/m2)로 층화하여 평가하였다. 체질량지수 25 kg/m2 미만인 남자에서는, 사지근육양이 낮으면 죽상경화증의 위험이 유의하게 높았으나, 체질량지수 25 kg/m2 이상인 남자에서는 관련성이 없었다. 반면 여자에서는 체질량지수에 상관없이 사지근육양과 죽상경화증의 독립적인 관련성이 관찰되지 않았다.

Citations

Citations to this article as recorded by

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