Study type: Medical/biological study (experimental study)

Thermal effects of mobile phones on facial nerves and surrounding soft tissue. med./bio.

Published in: Laryngoscope 2009; 119 (3): 559-562

Aim of study (acc. to author)

To investigate whether mobile phone use might cause temperature rise around the facial nerve and derangement of the nerve function.

Background/further details

12 male rabbits were exposed.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 1,900 MHz
Modulation type: pulsed
Exposure duration: continuous for 25 min

Exposure 1

Main characteristics
Frequency 1,900 MHz
Type
Exposure duration continuous for 25 min
Modulation
Modulation type pulsed
Repetition frequency 217 Hz
Exposure setup
Exposure source
Distance between exposed object and exposure source 2 mm
Setup phone held over the rabbit's ear; phone in speaking mode
Parameters
Measurand Value Type Method Mass Remarks
power 1.5 W - - - -
SAR 3.72 W/kg - calculated partial body -

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)

During the exposure, the average temperature of the surrounding soft tissue was significantly higher (0.39°C) compared to before exposure. After turning off the mobile phone the temperature decreased to pre-exposure values. The average rate of compound action potentials recorded before exposure and after exposure did not differ significantly. The average amplitude of action potentials recorded before exposure was significantly higher than after exposure and went back to normal 25 minutes after exposure.
The temporary temperature rise might have caused temporary facial nerve dysfunction. The authors believe that the observed temperature rise was not due to radiofrequency irradiation, but rather to the battery of the mobile phone or electrical power.

Study character:

Study funded by

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