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Equation for estimating total body water by bioelectrical impedance measurements in Japanese subjects



Equation for estimating total body water by bioelectrical impedance measurements in Japanese subjects



Annals of Physiological Anthropology 10(4): 203-210



This article reports a study in which the equation for total body water (TBW) estimated from deuterium(2H2O)-dilution mehtod and bioelectrical impedance measurement (BIM) is described. Subjects were 60 healthy males aged 30 .+-. 18.3 yr (18 .apprx. 74) and 31 healthy females aged 37 .+-. 17.5 yr (19 .apprx. 70). Total body water determined by the analysis of the dilution of orally ingested deuterium oxide (lg2H2O, 99.75 atom % excess/kg body weight) in urine. Biolectrical impedance was measured for each subjects in a supine position using an electrical impedance analyzer (500.mu.A, 50kHz, T-1988K, Toyo Physical Inc.) with a four electrodes (Y-250, Nihon Kohden). The mean values of total body water and the impedance in males and female subjects were 34.1 .+-. 4.27 l and 25.7 .+-. 2.42 l, 567 .+-. 28.5.OMEGA. and 562 .+-. 32.5.OMEGA., respectively. Height squared divided by resistance (Ht2/R) correleated well with TBW as measured by 2H2 O, r = 0.530 (p < 0.001) in males and r = 0.782 (p < 0.001) in females. The best-fitting regression equation to predict TBW comprised Ht2/R(X1) and body weight(X2) (R = 0.915, SEE = 1.70 l in males and R = 0.834, SEE = 1.28 l in femles). Equations were provided with BIM instrument for the prediction of TBW: for males TBW, l = 0.1983X1 + 0.4004X2-0.7938 and for females TBW, l = 0.3536X1 + 0.1269X2 + 3.3417. These results suggest that bioelectrical impedance measurement is a useful measure of total body water in Japanese subjects.

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Accession: 007310606

Download citation: RISBibTeXText

PMID: 1810307

DOI: 10.2114/ahs1983.10.203



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