103 men aged 28-50 years working at 4 radio broadcasting stations and at 2 radio line stations. All subjects worked in 4 day working cycles with a 12 h day shift, then 24 h rest , a 12 h night shift and 48 h rest. They were 125 shifts per year. 61 subjects from the radio station were considered as exposure group, where as 42 subjects employed at radio line station were considered as unexposed group.
A broadband MEH-1a meter with AE-1 and AE-2 probes for electric field and AH-1 probe for magnetic field was used for measurements. Maximum daily exposure levels were established for each subject at separate sites on the basis of partial (6 min) doses recorded during performance of routine tasks by a particular groups of workers during the 12 h shift.
Exposure to extremely-low-frequency electromagnetic fields and radiofrequency radiation: cardiovascular effects in humans.
Zmyslony M et al.
[Evaluation of selected parameters of circulatory system function in various occupational groups of workers exposed to high frequency electromagnetic fields].
Bortkiewicz A et al.
[Evaluation of selected parameters of circulatory system function in various occupational groups exposed to high frequency electromagnetic fields. II. Electrocardiographic changes].