Abstract
Multifrequency bioelectrical impedance is a new approach in impedance methodology. Theoretically an alternating current with a low frequency is not able to penetrate the cell membrane because of the high capacitive resistance of the membrane. Consequently the measured impedance at low frequency is a measure of extracellular water (ECW) only. At high frequency the capacitive resistance diminishes. Hence the measured impedance at high frequency will be related to total body water (TBW). Aim of this study was to develop prediction formulas for ECW and TBW at different frequencies and to check the validity of these formulas in the assessment of body water compartments and changes in body water compartments.
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