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Comparative study of the relationship between multi-frequency impedance and body water compartments in two European populations

Published online by Cambridge University Press:  09 March 2007

Anna Tagliabue ,
Hellas Cena  and
Paul Deurenberg
Anna Tagliabue
Affiliation:
Department of Human Nutrition, University of Pavia, Via Bassi 21, 27100 Pavia, Italy
Hellas Cena
Affiliation:
Department of Human Nutrition, University of Pavia, Via Bassi 21, 27100 Pavia, Italy
Paul Deurenberg
Affiliation:
Department of Human Nutrition, Wageningen Agricultural University, Bomenweg 2, 6703 HD Wageningen, The Netherlands
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Abstract

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To investigate possible differences in the relationship between multi-frequency impedance and bodywater compartments (total body water (TBW) and extracellular water (ECW)) measured by dilution techniques in two European populations, we studied forty Italian (twenty male and twenty female) and forty-three Dutch (twenty-three male and twenty female) healthy subjects aged 19–41 years. The main differences in body build between the two groups were height, trunk length and the two ratios TBW/height and ECW/height. Population-specific prediction formulas for ECW (at 1 kHz) and TBW (at 100 kHz) were developed. The prediction errors for ECW and TBW were about 0·6 and 1·5 kg respectively, (CV 4%) in both groups. Cross-validation analysis showed no significant error in the prediction of TBW but a slight error (range – 4·9 to + 2·8 %) in the ECW prediction. The biases in both TBW and ECW were correlated with ECW/TBW (r – 0·44, P < 0·0005 and r + 0·52, P <0·0005 respectively) in the two groups; the biases in ECW were also related to ECWIheight (r 0·51, P < 0·001), TBW/height (r 0·25, P < 0·05), trunk length (r 0·36, P < 0·001) and Z1/Z100 (r 0·32, P < 0·01). In conclusion, the water distribution between the extra- and intracellular compartments emerged in the present study as the major cause of error in the prediction of body water, and in particular of ECW from impedance measurements with a population-specific equation. Moreover, body build, expressed as TBW/height and ECW/height, had an impact on the bias.

Keywords

Body compositionTotal body waterMulti-frequency bioimpedance
Type
Multi-frequency impedance and body water
Information
British Journal of Nutrition , Volume 75 , Issue 1 , January 1996 , pp. 11 - 19
Copyright
Copyright © The Nutrition Society 1996

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