Blood samples were obtained from 13 healthy volunteers. Each sample was divided and one half was assigned to an exposure group (group 1) and the other half to a control group (group 2). After exposure, enriched fractions of monocytes and lymphocytes were investigated, respectively.
A positive control was conducted.
|Pulse width||463 µs|
|Duty cycle||12.5 %|
|Repetition frequency||217 Hz|
|Chamber||6 well dishes|
|Setup||the signal was generated by a GSM simulator and transferred to a rectangular waveguide made of aluminum by a co-axial wire; the samples were placed at a location with maximum electric and magnetic fields in the waveguide to provide a relatively homogeneous field for exposure; the increase of temperature was not more than 0.1°C|
Monocytes in the exposure group (group 1) showed a significantly increased content of reactive oxygen species compared to the control group (group 2). No significant differences between both groups were found in lymphocytes.
The authors conclude that exposure of human blood samples to a 900 MHz electromagnetic field (GSM) might induce oxidative stress in monocytes, although the consequences for health are not clear.