By applying similar principles, instead of the electrodes used in BIA, an electromagnetic coil provides the basis for the measurement of energy absorption with total body electrical conductivity (TOBEC). The energy absorption signal is primarily a function of the volume of the fat-free mass measured as the difference between the coil impedance when the subject is inside or outside the coil. The amount of energy absorbed is a function of the area, the magnetic field strength, and the conductivity per unit volume at a specific frequency.
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