Study type: Medical/biological study (experimental study)

Influence on the mechanisms of generation of distortion product otoacoustic emissions of mobile phone exposure. med./bio.

Published in: Hear Res 2005; 208 (1-2): 68-78

Aim of study (acc. to author)

To study the effects of mobile phone exposure on distortion product otoacoustic emissions generation mechanisms.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 900 MHz
Modulation type: pulsed
Exposure duration: continuous for 10 min
Exposure 2: 1,800 MHz
Modulation type: pulsed
Exposure duration: continuous for 10 min

General information

There were two sessions on separate days (at least 24 h apart) with a genuine (test) exposure and with a sham (control) exposure in a double-blind counterbalanced design. Half of the participants received GSM exposure at 900 MHz and the other half received GSM exposure at 1800 MHz.

Exposure 1

Main characteristics
Frequency 900 MHz
Type
Exposure duration continuous for 10 min
Modulation
Modulation type pulsed
Exposure setup
Exposure source
Setup A system of phone fixation, made of non-metallic plastic materials and consisting of a headband, an adjustable arm and a phone holder that allowed free head movement, was used for placing the phone in the normal use position, in accordance with CENELEC standard EN 50361.
Sham exposure A sham exposure was conducted.
Additional info The sham or genuine exposure was realised using a 50-Ω resistive load or an open-circuit dummy load of the same shape and structure connected to the remote antenna connector of the phone.
Parameters
Measurand Value Type Method Mass Remarks
power 2 W - - - -
SAR 0.41 W/kg maximum measured - -

Exposure 2

Main characteristics
Frequency 1,800 MHz
Type
Exposure duration continuous for 10 min
Modulation
Modulation type pulsed
Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
power 1 W - - - -
SAR 0.19 W/kg maximum measured - -

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

The data showed that 10 min of electromagnetic field exposure at the maximum power (2 W at 900 MHz or 1 W at 1800 MHz) does not induce any changes in either distortion product otoacoustic emissions generation mechanism.

Study character:

Study funded by

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