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노인의 저체중 및 악력 수준과 모든 원인 사망 위험의 연관성

Association of Underweight and Hand Grip Strength with the Risk of All-cause Mortality in Older Adults

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[목적] 본 연구는 노인의 저체중과 악력 수준이 모든 원인으로 인한 사망 위험에 미치는 영향을 조사하는데 목적이있다. [방법] 고령화연구패널조사에 참여한 65세 이상 노인 3,009명을 대상으로 하였으며, 체질량지수에 근거하여 저체중, 정상 체중, 과체중, 비만으로 집단을 세분화하였다. 또한 Asian Working Group for Sarcopenia의 근감소증 진단 기준에 근거하여 악력을 상위 집단과 하위 집단으로 분류하였다. 콕스비례위험회귀모델을 이용하여 체질량지수 및 악력수준에 따른 모든 원인 사망 위험비(HR, hazard ratio)를 95% 신뢰구간(CI, confidence interval)에서 산출하였다. [결과] 대상자의 평균 추적기간은 11.3±4.0년이었으며, 추적 기간 1,334명이 사망한 것으로 나타났다. 체질량지수및 악력 수준에 따른 사망 위험 분석 결과, 정상 체중 및 높은 악력 집단(HR=1)과 비교하여 과체중 및 높은 악력 집단(HR=0.773, 95% CI=0.627-0.954, p =.016)의 사망 위험은 유의하게 낮은 것으로 나타났으며, 저체중 및 낮은 악력집단(HR=1.930, 95% CI=1.523-2.446, p <.001), 정상 체중 및 낮은 악력 집단(HR=1.225, 95% CI=1.042-1.440, p =.014)의 사망 위험은 유의하게 높은 것으로 나타났다. 반면 저체중 및 높은 악력 집단의 사망 위험은 정상 체중 및높은 악력 집단과 비교하여 유의한 차이가 없는 것으로 나타났다. [결론] 본 연구의 결과는 노년기 규칙적인 운동을 통해 근력을 유지하는 것이 저체중으로 인한 사망 위험을 감소시키는데 중요한 역할을 할 수 있음을 시사한다.

Abstract

PURPOSE This study investigated the impact of underweight and hand grip strength (HGS) levels on the risk of all-cause mortality in older adults. METHODS Data from the 2006 baseline and 2020 follow-up assessments of the Korean Longitudinal Study of Aging (KLoSA), involving 3,009 older Koreans (≥65 years) were used in the study. Participants were categorized based on body mass index (BMI) as underweight, normal, overweight, or obese and grouped according to the Asian Working Group Sarcopenia criteria into high or low HGS. Cox proportional hazard models were used to estimate the hazard ratio (HR) and 95% confidence interval (CI) of all-cause mortality according to BMI and HGS categories. RESULTS During the 11.3±4.0 years follow-up period, 1,334 deaths from all causes occurred. The risk of death by BMI and HGS level was analyzed. The results showed that the risk of death in the overweight and high HGS group (HR=0.773, p=.016) was significantly lower than that in the normal weight & high HGS group (HR=1). In comparison, the risk of death in the underweight & low HGS group (HR=1.930, p<.001) and the normal weight & high HGS group (HR=1.225, p=.014) were significantly higher than normal weight & high HGS. However, the risk of death in the underweight and high HGS group showed no significant difference compared to the normal weight and high HGS group. CONCLUSIONS The current findings suggest that improving muscle strength through regular exercise may be important in preventing the risk of all-cause mortality due to being underweight.

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