Impedancemeters in general
Currently, multifrequency impedancemeters (number of frequencies more than 4) allow more precise measurements, especially in the interpretation of frequency zero and infinite frequency measurement. These resistances, called extracellular resistance and total resistance, are then integrated into algorithms that also take into account the patient’s characteristics (sex, weight, height, BMI, age, etc.) in order to calculate the patient’s water parameters: water total from the total resistance, extracellular water from the extracellular resistance and intracellular water that may come from the difference of the previous two by default.
Subsequently, most of impedancemeters available on the market take into account the universal hydration coefficient which indicates that 73.2% of the fat-free mass is equal to the total water volume. They deduce the fat mass and thus by difference with the weight, the fat-free mass.
Bioparhom technology : a new generation of impedancemeters
The Bioparhom Z-Metrix impedancemeters are part of a new generation of higher performance impedancemeters that allow a better match with reality, especially for patients who do not respect this normo-hydration, such as overweight or underweight patients. This new generation of devices allows an independent measurement between tissues and fluids and thus better measurement accuracy; we call this technology “non-deductive bioimpedance”.
In order to validate the tool, a double clinical validation, carried out between 2008 and 2010, made it possible to develop algorithms for measuring water parameters (validation vs Xitron) and tissues (validation vs DEXA). These dedicated equations measure body composition data with less than 3.5% error.
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