Study type: Medical/biological study (experimental study)

The effect of GSM-like ELF radiation on the alpha band of the human resting EEG. med./bio.

Published in: IEEE 30th Annual International Conference of the Engineering in Medicine and Biology Society (EMBC), 2008. IEEE, 2008: 5680-5683, ISBN 9781424418145

Aim of study (acc. to author)

To study the influence of extremely low frequency electromagnetic fields (emitted by GSM-DTX mobile phones) on human resting EEG.

Background/further details

72 healthy volunteers (35 females) were examined under: 1) sham exposure, 2) continuous radiofrequency exposure, 3) pulsed radiofrequency exposure and 4) pure extremely low frequency electromagnetic exposure. Partcipants attended a two hour recording session which included four 30 minutes intervals (four minutes break in between) where the order of exposure was counter balanced. In each 30 minutes interval, the first five minutes served as baseline, followed by 20 minutes exposure and five minutes post exposure period.

Endpoint

Exposure

Exposure Parameters
Exposure 1:
Exposure duration: continuous for 20 min
continuous RF
-
Exposure 2:
Exposure duration: continuous for 20 min
-
Exposure 3: 2–217 Hz
Exposure duration: continuous for 20 min

General information

participants were exposed in 4 times 20 min sessions with a 10 min break between exposures; exposures were in random order: i) continuous RF ii) pulsed RF iii) ELF iv) sham

Exposure 1

Main characteristics
Frequency
Type
Waveform
  • unspecified
Exposure duration continuous for 20 min
Additional info continuous RF
Exposure setup
Exposure source
Setup exposure device placed inside a Nokia 3110 mobile phone housing which was held in standard phoning position by a specially designed cradle
Sham exposure A sham exposure was conducted.
Parameters

No parameters are specified for this exposure.

Exposure 2

Main characteristics
Frequency
Type
Waveform
Exposure duration continuous for 20 min
Additional info pulsed RF
Exposure setup
Exposure source
Sham exposure A sham exposure was conducted.
Parameters

No parameters are specified for this exposure.

Exposure 3

Main characteristics
Frequency 2–217 Hz
Type
Exposure duration continuous for 20 min
Additional info simulation of the DTX frame structure
Exposure setup
Exposure source
  • same setup as exposure 1
  • additional wire loop of 9 mm radius inside the exposure device
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
magnetic flux density 25 µT - - - -

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)

A decrease in the alpha wave frequency band was observed during the 20 minutes of the extremely low frequency electromagnetic field exposure in the exposed hemisphere only.
The results suggest that extremely low frequency electromagnetic fields as emitted from GSM-DTX mobile phones may have an effect on the resting alpha wave frequency band of the human EEG.

Study character:

Study funded by

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