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The effects of exposure of rats to a magnetic and electric field (50 Hz) on the histology of the thyroid gland and thyroid hormone concentrations in the blood should be investigated.
The rats were divided into two groups: 1) exposure (n=12) and 2) sham exposure (n=11). Exposure started 24 hours after birth of rats.
|ばく露時間||continuous for 7 h/day, 5 days/week, for 3 months|
|ばく露装置の詳細||single coil of 2.5 mm thick wire placed on a wooden frame with 1320 turns; cages with animals were placed symmetrically on both sides of the coil|
|Sham exposure||A sham exposure was conducted.|
In histological analyses, the exposure group showed significant changes compared to the sham exposure group: increased volume density of thyroid follicles, decreased thickness of the follicular epithelium and intrafollicular colloid content, increased volume density of parafollicular cells, decreased volume of interfollicular connective tissue and increased number of degranulated mast cells.
No significant differences were observed in the concentrations of triiodothyronine and thyroxine concentrations in the blood between exposed animals an the sham exposure group, although a tendency towards smaller values in exposed animals was observed.
The authors conclude that exposure of rats to a magnetic and electric field (50 Hz) might cause alterations in the histology and function of the thyroid gland, which could be interpreted as a decrease of thyroid gland activity.