Oosthuizen G M, Joubert G, Mollentze W F, Rosslee E
Department of Internal Medicine, University of the Free State, Bloemfontein, South Africa.
Cent Afr J Med. 1997 May;43(5):126-31.
To estimate and compare the percentage of body fat in Black South Africans by underwater weighing (using three different equations), skinfold thicknesses measurements and bioelectrical impedance, in order to ascertain whether existing equations for body fat estimation apply to this racial group.
Blind comparison of techniques.
Academic hospital.
22 (11 female and 11 male) healthy Black South African volunteers were studied, for hydration reasons, we present the data of 14 (six female and eight male) with a Body Mass Index between 20 and 30 kg/m2.
Percentage of body fat.
The comparisons indicated that the different methods give results which are in the same direction (all correlations were 0.69 or higher), but apart from the three underwater weighing equations, the methods do not give results which are the same. The 95% limits of agreement indicated a difference of no larger than four units between the underwater weighing equations, whereas the skinfold estimate could differ from the underwater weighing estimates by as much as 14 units, and bio-impedance could differ from the underwater weighing estimates by as much as 18 units.
From this pilot study we conclude that skinfold thickness measurements and bioelectrical impedance are unproblematic means for estimating percentage of body fat. Existing equations for body fat estimation by underwater weighing and skinfold thickness measurements seem to be applicable to this racial group, but we suggest that further research should be conducted to develop, ethnic-specific equations within racial parameters.
通过水下称重法（使用三种不同公式）、皮褶厚度测量法和生物电阻抗法来估算和比较南非黑人的体脂百分比，以确定现有的体脂估算公式是否适用于该种族群体。
技术的盲法比较。
学术医院。
研究了22名（11名女性和11名男性）健康的南非黑人志愿者，出于水合作用的原因，我们展示了14名（6名女性和8名男性）体重指数在20至30kg/m²之间的数据。
体脂百分比。
比较表明，不同方法得出的结果方向相同（所有相关性均为0.69或更高），但除了三种水下称重公式外，这些方法得出的结果并不相同。95%的一致性界限表明，水下称重公式之间的差异不超过4个单位，而皮褶厚度估算值与水下称重估算值的差异可能高达14个单位，生物电阻抗与水下称重估算值的差异可能高达18个单位。
从这项初步研究中我们得出结论，皮褶厚度测量和生物电阻抗是估算体脂百分比的可靠方法。现有的通过水下称重和皮褶厚度测量来估算体脂的公式似乎适用于该种族群体，但我们建议应进一步开展研究，在种族参数范围内开发针对特定种族的公式。
