Electrical bioimpedance analysis of structural modifications in biological tissues caused by a static magnetic field

<i>Objective</i>. To evaluate the effects of static magnetic field (SMF) on avian brain and muscle tissues using electrical bioimpedance (EBI) as a non-invasive monitoring method, assessing changes in tissue impedance and phase angle to understand cellular responses under a 200 mT SMF.<i>Approach</i>. A custom experimental setup with needle electrodes was used to acquire EBI data from avian brain and muscle tissues exposed to 200 mT SMF for 60 min. Impedance and phase angle measurements were analyzed to assess tissue-specific responses. Frequency analysis and Lissajous curves were employed to identify signal amplitude changes.<i>Main results</i>. Brain tissue exhibited a faster exponential impedance decay (<i>τ</i>= 13.3 min) compared to muscle tissue (<i>τ</i>= 29.5 min). Phase angle measurements indicated capacitive membrane dynamics. Frequency analysis revealed low-frequency metabolic disruptions and stable 51 Hz oscillations. Lissajous curves showed SMF-induced reductions in low-frequency signal amplitudes, more pronounced in brain tissue.<i>Significance</i>. EBI proved effective for real-time, non-invasive monitoring of SMF-induced changes in tissue electric properties, highlighting tissue-specific responses. These findings suggest EBI's potential as a diagnostic tool for studying SMF effects, with future research needed to explore varied tissues and SMF intensities to enhance clinical applications.