생체전기저항법과 인체측정법에 의한 신체구성 평가의 비교 -고령자를 중심으로-
Predictive accuracy of bioelectrical impedance and anthropometry methods in estimating body composition in elderly
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김현수, 이경진. 생체전기저항법과 인체측정법에 의한 신체구성 평가의 비교. 운동과학, 제14권 제3호, 241- 250, 2005. 신체구성 평가벙법으로 현장이나 임상에서 생체전기저항법(이하, BI법)과 인체측정법(이하, ANT법)이 널리 이용되고 있다. 본 연구의 목적은 이중 에너지 X-선 흡수법(Dual energy X-ray absorptiometry; 이하, DXA법)으로 측정한 체지방률(기준값)과 발-발 저항값을 이용하여 만든 BI 기구 및 신체질량지수와 상완배부의 피하지방두께를 이용하여 작성한 체지방량 추정공식(Svendsen, 1993)으로 구한 체지방률을 비교하는 것이다. 60세 이상의 고령자 남성 23명(70.9±4.5)과 여성 24명(66.3±3.7세)을 대상으로 DXA, BI, ANT로 측정한 체지방률은 각각 28.4 (8.6)%, 28.1 (8.2)%, 25.7 (8.1)%였다. DXA법과 BI법 및 ANT법 사이에는 각각 0.91, 0.95의 높은 유의한 상관을 보였으나, 평균의 절대값 차는 각각 -0.5 (2.8)%BF, 1.6 (2.5)%BF를 보였다. 그리고 ANT법은 DXA법으로 구한 %BF를 9.5%나 과소평가하였다. 이러한 결과는 외국인을 대상으로 하여 작성된 ANT법이 비록 기준값과 상관관계는 높을지라도 평균의 절대값 차이 등을 고려할 때 추정도가 크게 떨어진다는 것을 확인할 수 있었으며, 보다 정확한 체지방률을 구하기 위해서는 한국인 고령자의 인체측정값과 생체전기저항을 이용한 추정식이 필요할 것으로 사료된다.
Abstract
Kim, H.S., Lee, K.J. Predictive accuracy of bioelectrical impedance and anthropometry methods in estimating body composition in elderly. Exercise Science, 14(3): 241-250, 2005. Bioimpedance (BI) and anthropometry (ANT) methods for assessing body composition have been used. The purpose of this investigation was to compare estimates of human body composition determined from foot-pad style BI and ANT methods. The human body composition was assessed by dual energy X-ray absorptiometry (DXA), BI method and ANT equation (svendsen, 1993). Twenty three men and 24 women, aged 60-82 years, served as subjects. The mean (SD) percentage of body fat (%BF) assessed by DXA, BI, and ANT methods were 28.4 (8.6)%, 28.1 (8.2)% and 25.7 (8.1)%, respectively. There were high validity coefficients (r=.91 and .95, for BI and ANT, respectively) with the %BF measured by DXA. However, compared to the criterion measures of %BF (DXA), the magnitude of agreement in the BI and ANT revealed a different pattern. The mean absolute difference between DXA and BI measurements was -0.5 (2.8) %BF and, between DXA and ANT it was 1.6 (2.5) %BF. Compared to the DXA method, the STF method was as much as a 9.5% underestimation of %BF. The results suggest that although the ANT provided high correlation with criterion value, use of the ANT may not suitable for assessing the %BF of the elderly in Korea.
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