Study type: Medical/biological study (experimental study)

Effects of GSM signals during exposure to event related potentials (ERPs). med./bio.

Published in: Int J Occup Med Environ Health 2010; 23 (2): 191-199

Aim of study (acc. to author)

To study the effect of electromagnetic fields from the GSM mobile phone system on human brain function.

Background/further details

15 subjects (7 men, 8 women) participated and each subject was investigated during exposure and sham exposure condition.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 935 MHz
Exposure duration: continuous for 20 min.

Exposure 1

Main characteristics
Frequency 935 MHz
Type
Exposure duration continuous for 20 min.
Exposure setup
Exposure source
Chamber darkened soundproof chamber
Setup mobile phone fixed with a plastic holder in a position typical for receiving phone calls and was connected to an external microprocessor; the call was simulated by directly wiring the phone to a tape-recorder which played a pre-recorded voice message
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
power density 0.01 W/m² minimum measured - -
power density 100 W/m² maximum measured - -
power density 0.052 W/m² mean measured - -
SAR 0.81 W/kg - - - manufacturer's specification

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Investigated organ system:
Time of investigation:
  • before exposure
  • during exposure
  • after exposure

Main outcome of study (acc. to author)

The data did not reveal statistically significant changes in the latencies of N100, N200, P200 waves (that precede the P300 wave) nor in the latency of the P300 wave itself during and after the exposure to 935 MHz electromagnetic fields in relation to respective pre-exposure values. Also in the sham exposure measurement series, mean values of those waves did not differ from the original values.
On the other hand, the statistical analysis showed a statistically significant effect on P300 amplitude. Under real exposure conditions P300 amplitude was lower during the exposure (in comparison with sham exposure). Afterwards, the amplitude returned to the pre-exposure value.
The authors conclude that exposure to GSM electromagnetic fields exerts some effects on central nervous system, including its auditory evoked potentials

Study character:

Study funded by

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