|Exposure duration||continuous for 1 or 2 weeks|
|Setup||1 m square Helmholtz coils in a wooden frame; winding of 200 turns for each coil split in half for allowing the current to flow in the same sense through each half of the winding (field aiding); coils mounted on a platform; animal cage placed in the center of the coil system|
|Sham exposure||A sham exposure was conducted.|
The exposure to extremely low frequency magnetic fields altered the distribution and occurrence of gastrin- (increase), ghrelin- (decrease) and somatostatin- (decrease) positive endocrine cells in the stomach of rats. However, the secretion of those hormones into the blood from endocrine cells did not change significantly with exposure.
Comparing with sham exposure, extremely low frequency magnetic field exposure for one and two weeks induced an increase in BaSO4 suspension propelling ratio of gastrointestinal tract, indicating that extremely low frequency magnetic field affects gastrointestinal motility.
The data revealed that extremely low frequency magnetic field exposure might influence the activity of endocrine cells, an important element of the intrinsic regulatory system in the digestive tract.