Mr Jalal Al-Din Saa’di, Mr Mohammad Ranjbarian, Mr Koroush Etemad, Rozita Farhadi, Fatemeh Zarei,
Volume 11, Issue 2 (11-2019)
Abstract
Introduction: Today the rate of human beings exposed to electromagnetic fields is increasing deliriously and human beings are being more drowned in the ocean of electromagnetic fields each day. It has been a long time that the effects of electromagnetic fields on organisms has been studied by researchers and due to the long-term researches and the slow impact of fields on life-cycle processes, in a lot of cases a final opinion is impossible. Considering the detrimental effects of being exposed to electromagnetic radiations, this study aimed to determine the relation between electromagnetic radiations and the level of Melatonin and Cortisol hormones of serum (blood) of the male employees of the 230kV substations in Golestan Province.
Materials and Methods: this study has been accomplished with the cross sectional method (descriptive-analytic) on male employees of the 230 kilo-Volt substations in Golestan Province(1396). The results achieved from the serum sample of the case and control groups have been compared, and the measurements and the relation between them has been analyzed, using Spss22 software.
Results: 100 % of the measured electric field intensity and magnetic flux density of the 230kV substations in Golestan Province is less than Iran’s occupational limits. There was no significant difference between the average of the level of Cortisol hormone in the case and control groups. The average of the level of Cortisol in the substation job group was not significantly different. There is no significant difference in the average of Cortisol level and age category and work place
Conclusion: Electromagnetic radiations do not affect the level of Cortisol hormones of the male employees of the 230 kV substations in Golestan province and the electric and magnetic fields intensity of substations is in the occupational limits of Iran.
Msc Parvaneh Yekzamani, Dr. Azadeh Ashtarinezhad, Dr. Jamileh Aboulghasemi, Msc Batol Masruri, Dr. Maedeh Arabian, Dr. Iraj Alimohammadi,
Volume 14, Issue 1 (5-2022)
Abstract
Introduction: light intensity and duration are physical factors that affect hormone secretion and circadian rhythms. This study aimed to determine the effects of various light intensities on serum melatonin and cortisol levels.
Materials and methods: This experimental study was carried out on 32 male rats: Group 1 as the control group, received a brightness of 150 lux, and groups 2, 3, and 4 as the exposure groups received light intensities of 300, 5000, and 8000 lux for 14 days, respectively. To evaluate hormone levels, blood samples were taken on before and after 7 and 14 days of exposure. Then cortisol and melatonin levels were determined by ELISA. Data were analyzed using SPSS.
Results: The results showed that cortisol levels after seven days of exposure in the groups exposed to the light intensity of 300, 5000, and 8000 lux increased significantly compared to the control group, and after 14 days, the level of cortisol in the groups. Exposure to a light intensity of 5000 and 8000 lux increased significantly compared to the control. Also, melatonin levels in the group of rats exposed to the light intensity of 5000 lux and 8000 lux after 7 and 14 days of exposure compared to the control significantly decreased.
Conclusion: Increased light intensity is associated with increased melatonin suppression and cortisol levels. It is suggested that more studies be done to prove the effect of different light intensities on changes in the levels of these hormones at varying hours of the day.
