Effects of Electrode Systems on Numerical Estimation of Internal Human Body Impedance at Power Frequency

Internal body impedances R i of an anatomically realistic human model were numerically calculated at 60 Hz under various current scenarios and electrode sizes. On the basis of the numerical results, the effects of electrode systems on R i were investigated. It is found that R i obtained for a two‐electrode model are larger than those for a four‐electrode model by a factor of up to about 1.3. This means that the body impedances measured by using the four‐wire method are smaller than the calculated ones by up to about 23%. At the end, it is concluded that, although the difference in the electrode systems is a cause of the disagreements between the calculated and measured body impedances, its effect is insufficient to fully reconcile the actual disagreements. Copyright © 2010 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.