EFFECTS OF DIFFERENT DURATIONS AND INTENSITIES EXPOSURE OF STATIC MAGNETIC FIELDS ON THE HYPOTHALAMIC-PITUITARY-THYROID AXIS IN THE MALE RATS

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AHANGARPOUR A.; FATHI MOGHADAM H.; TAHMASBI BEYRGANI M.J.; SHAHBAZIAN H.; BADVI M.

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Journal: Jundishapur Scientific Medical Journal Year:2008 | Volume:7 | Issue:3 (58) Page(s): 337-345

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Title

EFFECTS OF DIFFERENT DURATIONS AND INTENSITIES EXPOSURE OF STATIC MAGNETIC FIELDS ON THE HYPOTHALAMIC-PITUITARY-THYROID AXIS IN THE MALE RATS

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T3Q2

TSHQ3

STATIC MAGNETIC FIELD AND HYPOTHALAMIC-PITUITARY-THYROID AXISQ3

Abstract

Objectives: The aim of this study was to evaluate the effects of static magnetic fields (SMF) on hypothalamic-pituitary-thyroid (HPT) hormonal disturbances. Materials and Methods: One hundred and ninety two male rats were divided into four experimental protocols. Each experimental protocol consisted of four groups and each group contained 12 rats. After one-week adaptation, rats were exposed to SMF (0, 6, 12 and 24mT, at 50 Hz) for 40 or 120 minutes daily (at 9 a.m.) for 17 or 34 days. At the end of each experiment, the animals were anaesthetized; blood sera were collected and kept frozen under -20oC until use. TSH and thyroid hormones were measured by IRMA and RIA methods using g-counter equipment. The results were analyzed by ANOVA statistical method, followed by Tukey posthoc test.Results: No change was observed in TSH and thyroid hormones following exposure to SMF of 40 min/day for 17 days. TSH at many SMFs protocols, exposed or sham-exposed animals have not affected, except those rats exposed to 24mT (120 min/day for 34 days) which was higher than other groups with same protocol (P<0.05), also T3 resin uptake significantly has decreased. There were statistically significant increased in serum free thyroxine index and total thyroxine values at 12 and 24mT (40 min/day for 34 days) compared with other groups (P<0.01 and P<0.001 respectively). Serum free thyroxine index and total thyroxin values at 24mT (120 min /day for 17 days) was significantly lower compare to sham-exposed animals (P<0.05), however TSH and free thyroxin levels did not change significantly (P>0.05) using this SMFs. Conclusion: SMF, with low duration (17 days) and short time exposure (40 min/day) cannot alter HPT hormonal axis secretion in male rats. But it can enhance HPT axis disorders with increasing duration (34 days) and long time exposure (120min/day).

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APA: Copy

AHANGARPOUR, A., FATHI MOGHADAM, H., TAHMASBI BEYRGANI, M.J., SHAHBAZIAN, H., & BADVI, M.. (2008). EFFECTS OF DIFFERENT DURATIONS AND INTENSITIES EXPOSURE OF STATIC MAGNETIC FIELDS ON THE HYPOTHALAMIC-PITUITARY-THYROID AXIS IN THE MALE RATS. JUNDISHAPUR SCIENTIFIC MEDICAL JOURNAL, 7(3 (58)), 337-345. SID. https://sid.ir/paper/12418/en

Vancouver: Copy

AHANGARPOUR A., FATHI MOGHADAM H., TAHMASBI BEYRGANI M.J., SHAHBAZIAN H., BADVI M.. EFFECTS OF DIFFERENT DURATIONS AND INTENSITIES EXPOSURE OF STATIC MAGNETIC FIELDS ON THE HYPOTHALAMIC-PITUITARY-THYROID AXIS IN THE MALE RATS. JUNDISHAPUR SCIENTIFIC MEDICAL JOURNAL[Internet]. 2008;7(3 (58)):337-345. Available from: https://sid.ir/paper/12418/en

IEEE: Copy

A. AHANGARPOUR, H. FATHI MOGHADAM, M.J. TAHMASBI BEYRGANI, H. SHAHBAZIAN, and M. BADVI, “EFFECTS OF DIFFERENT DURATIONS AND INTENSITIES EXPOSURE OF STATIC MAGNETIC FIELDS ON THE HYPOTHALAMIC-PITUITARY-THYROID AXIS IN THE MALE RATS,” JUNDISHAPUR SCIENTIFIC MEDICAL JOURNAL, vol. 7, no. 3 (58), pp. 337–345, 2008, [Online]. Available: https://sid.ir/paper/12418/en

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