Body Composition Assessed by Sulfer Hexafluoride-dilution Method

本研究的目的是确定六氟化硫(SH)稀释法间接评价人体成分的重复性、可变性和交叉效度。研究对象为：1)男90名，女131名，年龄18-；2)男46名，女35名，年龄6-17岁；数据分析表明，男性和女性群体的重复性(r=0.999)和效度(r=0.999)都很高。而SH法测得的绝对体积比标准值高出约1%。在本研究中，(2)成年男性DB=Wt/(1.00V-0.98)-(3)成年女性DB=Wt/(1.01V-1.10)老年男性的Db=Wt/(0.98V+0.39)-(5)老年女性的Db=Wt/(0.96V+1.53)-(6)Wt=体重(Kg)，V=身体体积(1)。公式(3)和(4)在其他成年男性和女性组中得到交叉验证。这些组获得的平均DB值与验证组没有显著差异。绝对值几乎相同。显然，本研究中基于SH方法建立的预测方程有可能作为身体成分的另一种有用的测量(标准)。

The purpose of this study were to determine the reproducibility, varidity and cross-validity of sulfer hexafluoride (SH) dilution method for the indirect assessment of human body composition. The subjects were 1) 90 males and 131 females, aged 18-64 yrs, in 1995 grant-in-aid for scientific research, and 2) 46 boys and 35 girls, aged 6-17 yrs, and 21 male elders and 14 female elders, aged 65-81 yrs in 1996 grant-in-aid for scientific research. Analysis of data indicated that both reproducibility (r=0.999) and validity (r=0.999) were very high in male and female populations. However, the absolute body volume measured by SH method was approximately 1% higher than criterion value. In the present study., orrected prediction equations for determining one's body density (Db) were developed as follows.Db = Wt/(0.99V-0.13) in male children ----- (1)Db = Wt/(0.98V+0.15) in female children --- (2)Db = Wt/(1.00V-0.98) in adult men --------- (3)Db = Wt/(1.01V-1.10) in adult women ------- (4)Db = Wt/(0.98V+0.39) in elderly men ------- (5)Db = Wt/(0.96V+1.53) in elderly women ----- (6)where Wt = weight (kg) and V = body volume (1).Equations (3) and (4) were cross-validated in the other groups of adult men and women. The mean Db values obtained for those groups were not significantly different from the validation group. The absolute values were almost the same. It is apparent that prediction equations developed in this study based on the SH method has the potential to serve as another useful measure (criterion) of body composition.