Effects of 900MHz electromagnetic field on TSH and thyroid hormones in rats

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By:
Ahmet Koyu a, Gokhan Cesur a,
Fehmi Ozguner a, Mehmet Akdogan b,
Hakan Mollaoglu a, Sukru Ozen c

a Department of Physiology, Suleyman Demirel University, School of Medicine, 32260 Isparta, Turkey
b Department of Biochemistry and Clinical Biochemistry, School of Medicine, 32260 Isparta, Turkey
c Academy of Vocational Sciences, Akdeniz University, Antalya, Turkey

ARTICLE INFO

Article history
Received 28 December 2004
received in revised form 1 March 2005
accepted 1 March 2005
Available online 11 April 2005

Keywords
900MHz electromagnetic field
TSH
T3
T4

ABSTRACT

In this study, the effects of exposure to a 900 megahertz (MHz) electromagnetic field (EMF) on serum thyroid stimulating hormone (TSH) and triiodothronine–thyroxin (T3–T4) hormones levels of adult male Sprague–Dawley rats were studied.
Thirty rats were used in three independent groups, 10 of which were control (without stress and EMF), 10 of which were exposed to 900MHz EMF and 10 of which were sham-exposed.
The exposures were performed 30 min/day, for 5 days/week for 4 weeks to 900MHz EMF.
Sham-exposed animals were kept under the same environmental conditions as the study groups except with no EMF exposure.
The concentration of TSH and T3–T4 hormones in the rat serum was measured by using an immunoradiometric assay (IRMA) method for TSH and a radio-immunoassay (RIA) method for T3 and T4 hormones.
TSH values and T3–T4 at the 900MHz EMF group were significantly lower than the sham-exposed group (p < 0.01). There were no statistically significant differences in serum TSH values and T3–T4 hormone concentrations between the control and the sham-exposed group (p > 0.05).
These results indicate that 900MHz EMF emitted by cellular telephones decrease serum TSH and T3–T4 levels.

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