Influence of a magnetic field on changes in bio-impedance

Abstract

This paper describes a system that enables quantitative monitoring and evaluation of the influence of a pulse magnetic field on a living organism with the use of bioimpedance measurement. We use the bio-impedance method to evaluate the haemodynamics. The magnetotherapeutic instrument uses a couple of Helmholtz coils as the applicator. The magnetic field strength is approximately 60 mT. The current of these coils is controlled by a pseudo-random impulse signal. The bio-impedance is measured by the four-electrode method, using an RF narrow band vector bio-impedance meter on the forearm. During exposure to the magnetic field the bioimpedance signal level increases above the normal and the maximum level is reached after about 10 minutes. The maximum value is approximately 50 % higher than the normal level. © Springer-Verlag 2007.