Method for Body Impedance Measurement

The paper proposes a method for body or bioelectrical impedance (BI) measurement based on voltage measurement and analysis at different frequencies with a four-electrodes configuration and the principles of virtual instrumentation. The measured values are used to calculate: the effective (root mean square) values of voltages and currents, the apparent power, the active power, the phase shift, the resistance and the electrical capacity of the body. For the experiment, an NI PCI-6110 data acquisition board and the LabVIEW programming environment from National Instruments were used.