10.8. Body Composition
The parameters of interest in body composition analysis (bioelectric impedance analysis, BIA) are total body water (TBW), extracellular/intracellular fluid balance, fat-free mass (lean body mass or muscle mass), and fat mass. Application areas are as diversified as sports medicine, nutritional assessment, and fluid balance in renal dialysis and transplantation.
One of the first to introduce the method was Thomasset (1965), using a two-electrode method and 1 kHz signal frequency. With just two electrodes, it is important to use large-area band electrodes to reduce the contribution from the current constrictional zones near the electrodes. With a tetrapolar electrode system, it is easier to select the preferred volume to be ...
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