60 male workers with employment in electric power generation (n=12), distribution (n=31) or utility maintenance and administration (n=17) of an electric utility participated in the study. Regardless of their employment, the subjects were divided into 4 groups (quartiles, n=15 each) according to the mean values of their personal magnetic fieldexposure: groups 1, 2, 3 and 4. 4 sampling trials were conducted during 1 year. In each trial, after a non-work baseline day and the following 3 working days, overnight urine samples were collected (days 0, 1, 2, and 3), respectively. This procedure was repeated quarterly over the year. Additionally, subjects provided a blood sample at the end of day 3 during their third quarter of participation. Melatonin was investigated because of its immunostimulating effect.
National Institute of Environmental Health Sciences/National Institute of Health (NIEHS/NIH), USA
Hosseinabadi MB et al.
Effect of long-term occupational exposure to extremely low-frequency electromagnetic fields on proinflammatory cytokine and hematological parameters
Tiwari R et al.
The Potential Bioeffects of Extremely Low Frequency Electromagnetic Fields on Melatonin Levels & Related Oxidative Stress in Electric Utility Workers Exposed to 132 kV Substation
Touitou Y et al.
Long-term (up to 20 years) effects of 50-Hz magnetic field exposure on immune system and hematological parameters in healthy men
Gobba F et al.
Natural killer cell activity decreases in workers occupationally exposed to extremely low frequency magnetic fields exceeding 1 microT
Gobba F et al.
Extremely low frequency-magnetic fields (ELF-EMF) occupational exposure and natural killer activity in peripheral blood lymphocytes