Body impedance data acquisition system for quantitive measurement of conductive potential of body - uses segmental impedance signals and/or multiple, variable frequency impedance measurements to measure total body water

摘要

The data acquisition system provides an accurate valid measurement of human body composition consisting of fat tissue, lean tissue and body water using a quantitative measurement of the conductive potential of the body, which is based on the lean tissue content of the body. The quantitative measurement is produced as a "bio-impedance signal." The electrical signal, in ohms, is derived by measuring body impedance component of the system. The resultant signal (three digit number, between 1 and 1000 ohms) is then entered into a modifying component to accurately predict the body composition of the tested individual. The modifying component comprises prediction formulas derived from biological data inputs including: a patient's height, weight, age, and sex to determine a "population prediction variable", and is used to interpret bio-impedance readings as "population specific", i.e., specific impedance values are exhibited by various pre-defined populations of individuals.