A relationship between bioelectrical impedance and total body water in young adults |
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Authors: | P S Davies S E Jagger J J Reilly |
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Institution: | Infant and Child Nutrition Group, MRC Dunn Nutrition Unit, Cambridge, UK. |
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Abstract: | Total body water was measured using the stable isotope H2(18)O in 14 young adults. Body resistance was assessed using a tetrapolar technique using a Holtain body-composition analyzer. Total body water was highly correlated (r = 0.96; p less than 0.001) with height2/resistance. The inclusion of body weight in the prediction equation reduced the standard error of estimate from 1.9 to 1.51. Bioelectrical resistance can be used to assess other body-composition parameters such as fat-free mass and fat mass, but this use involves a number of assumptions which may confound the relationship. We suggest that the measurement of bioelectrical impedance may, however, have a role in the estimation of total body water. |
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