Exposure duration: repeated daily exposure for 4 hours per day for one month
Twelve animals were exposed to the influence of ELF-EMF, another twelve animals served as controls and were maintained in a similar environment, but without the presence of artificially produced ELF-EMF.
|Distance between exposed object and exposure source||12 cm|
|Setup||The exposure system was made of a single coil of solenoid type equipped with a cooling system and energized from 50 Hz, 220 V and 10 A via an autotransformer, which provided 100 V output. Cages with animals were placed at the both sides of the coil at a 12 cm distance and were covered with a plastic lid. The EMF produced by the coil was in the horizontal direction relative to the geomagnetic field, it was inhomogeneous and of decaying intensity along the animal cages with 300 µT and 160 V/m on the side of the cage near the coil and 100 µT and 54 V/m on the opposite side, while the value of the electric field at any other point in the room was less than 10 V/m.|
|Additional info||The residential values of the magnetic and electric fields were measured to be 0.2 µT and 2.9 V/m, while the value of the geomagnetic field was 40 µT.|
The numerical and volume density of intact type A mast cells (type A: compact with abundant cytoplasmatic granules) in the thyroid of the exposed group was significantly higher compared to the control. A number of mast cells and immunoreactive nerve fibers were observed in the skin and of histamine-immunoreactive mast cells in the thyroid of exposed rats. The differences in stereological data were not statistically significant.
The findings indicate certain alterations of cutaneous and thyroid mast cells in rats exposed to electromagnetic fields.