Study type:
Medical/biological study
(observational study)
Effect of long-term occupational exposure to extremely low-frequency electromagnetic fields on proinflammatory cytokine and hematological parameters
med./bio.
By:
Hosseinabadi MB, Khanjani N, Samaei SE, Nazarkhani F
Published in: Int J Radiat Biol 2019; 95 (11): 1573-1580
Participants in this study were employees working in different sections of a power plant in Semnan, Iran. A total of 112 employees were included in the study as an exposure group and 138 employees as a control group. The exposure group consisted of technicians (n=33), operators (n=27), mechanics (n=23) and office workers working close to sources of ELF-MF and EF (n=29), while the control group consisted of office workers who were all exposed only to a very low intensity ELF-MF and EF. Blood samples were taken from all participants before the start of the work shift on the last working day of the week. All participants were male.
participants were exposed to ELF-MF and EF mainly generated by transmission lines, electrical generators, transformers and distribution grids; participants specified their working and non-working workstations (e.g. their places of resting and eating lunch) and the amount of time that they spent in each workstation; spot measurements were taken at these workstations; measuring the magnetic fields was performed by placing the probe device at a height of 1 m; in order to measure the electric fields, the device probe was placed at a 1 m height and 2.5 m distance to the workers’ body, in order to measure the electric fields without disturbance; a particular distance was kept ; in total, about 700 spots in the workstations were measured; the 8 h time-weighted average of exposure to the magnetic fields and electric fields were calculated afterwards
office workers participated in the planning and scheduling of all plant activities, and the development and improvement of policies, standards and procedures; some were working inside the power plant and in a department which was located close to the turbines and generators and this led to a high level of ELF-MF and EF; in addition, they had to investigate and report the status of the low voltage and medium voltage rooms of the power plant daily and monitor how other job groups do their tasks
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