Study type: Medical/biological study (experimental study)

Effects of 2G and 3G mobile phones on human alpha rhythms: Resting EEG in adolescents, young adults, and the elderly. med./bio.

Published in: Bioelectromagnetics 2010; 31 (6): 434-444

Aim of study (acc. to author)

To study whether adolescents and/or the elderly are more sensitive to mobile phone-related bioeffects than young adults, and to determine this for both 2nd generation (2G) GSM, and 3rd generation (3G) W-CDMA exposures.

Background/further details

41 adolescents (13-15 years), 42 adults (19-40 years), and 20 elderly (55-70 years) were tested. Each participant received sham exposure, 2G and 3G exposures, separated by at least four days.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 894.6 MHz
Modulation type: pulsed
Exposure duration: continuous for 55 min
Exposure 2: 1,900 MHz
Exposure duration: continuous for 55 min

General information

During all experiments 50 dB white noise was produced to have a constant noise level.

Exposure 1

Main characteristics
Frequency 894.6 MHz
Type
Exposure duration continuous for 55 min
Additional info 2G mobile phone
Modulation
Modulation type pulsed
Repetition frequency 217 Hz
Exposure setup
Exposure source
  • Nokia 6110 handset
Chamber sound-attenuated and metal-shielded room
Setup 2G handset was placed in a craddle on one side of the head and the 3 G handset on the other side, both in "touch" position; speaker was removed from the phone
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
electric field strength 30 mV/m maximum measured - at the subject's head
power 250 mW mean - - -
power 2 W peak value - - -
SAR 0.7 W/kg peak value measured and calculated 10 g -

Exposure 2

Main characteristics
Frequency 1,900 MHz
Type
Exposure duration continuous for 55 min
Additional info 3G mobile phone
Exposure setup
Exposure source
  • monopole
Chamber sound-attenuated and metal-shielded room
Setup 2G handset was placed in a craddle on one side of the head and the 3 G handset on the other side, both in "touch" position; speaker was removed from the phone; metalic handset with shape and size of a typical mobile phone handset; monopole antenna inside the handset fed by an external RF source suppling a W-CDMA signal
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
electric field strength 30 mV/m maximum measured - at the subject's head
power 125 mW average over time - - -
SAR 1.7 W/kg peak value measured and calculated 10 g -

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 showed that the young adults' alpha wave activity was greater in the 2G exposure compared to sham exposure. However, no effect was found in the adolescent or the elderly groups, and no effect of 3G exposures was found in any group. The data provide further support for an effect of 2G exposures on resting alpha wave activity in young adults, but fail to support a similar enhancement in adolescents or the elderly, or in any age group as a function of 3G exposure.
In conclusion, the data suggest that adolescents may not represent a more sensitive population in terms of mobile phone alpha wave effects, and that the effect on alpha wave may be restricted to 2G cell phones.

Study character:

Study funded by

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