Abstract:

Abstract:Objective To study the exposure levels of extremely low frequency electromagnetic fields in two workplaces,and to observe the health effects of occupational groups exposed to extremely low frequency electromagnetic radiation in two workplaces.Methods The intensities of electromagnetic fields in two workplaces(control group and exposure group) were detected with EFA-300 frequency electromagnetic field strength tester,and the intensity of the noise was detected with AWA5610D integral sound level.Professional information,household information and personal health condition of 183 controls and 521 subjects in exposure group were investigated by multi-center simple random sampling method.The data was analyzed by SPSS 17.0 statistic software.Results The intensities of electric fields and the magnetic fields in exposure group were significantly higher than those in control group(P<0.05),but the intensities of the noise in two workplaces showed no difference(P>0.05).The questionnaires survey data showed that compared with control group, the incidence of symptoms of loss of hair  in exposure group was significantly higher (P<0.05) and the incidence of decreased hearing was lower （P<0.05）.Conclusion Exposure to extremely low frequency electromagnetic radiation may have some effects on the nervous system of workers.

Key words: electromagnetic radiation;extremely low frequency electromagnetic fields, nervous system;epidemiological survey