Study type: Medical/biological study (experimental study)

Changes in tympanic temperature during the exposure to electromagnetic fields emitted by mobile phone. med./bio.

Published in: Int J Occup Med Environ Health 2012; 25 (2): 145-150

Aim of study (acc. to author)

To study if exposure to electromagnetic fields emitted by mobile phones influenced the tympanic temperature.

Background/further details

10 healthy young men were examined before, during and after the following three conditions: 1.) 2 x 60 min of sham exposure, 2.) continuous, 60 min exposure and 60 min sham exposure, 3.) intermittent exposure.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 900 MHz
Exposure duration: continuous for 60 min
  • SAR: 1.23 W/kg
Exposure 2: 900 MHz
Exposure duration: intermittent for 120 min. (4 x 15 min "on", 4 x 15 min "out")
  • SAR: 1.23 W/kg

Exposure 1

Main characteristics
Frequency 900 MHz
Exposure duration continuous for 60 min
Exposure setup
Exposure source
Setup mobile phone mounted on a stand; subject had to keep the head close to the phone
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
SAR 1.23 W/kg - - 1 g -

Exposure 2

Main characteristics
Frequency 900 MHz
Exposure duration intermittent for 120 min. (4 x 15 min "on", 4 x 15 min "out")
Exposure setup
Exposure source
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
SAR 1.23 W/kg - - 1 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 mean tympanic temperature in the whole group during continuous exposure was significantly higher (0.02°C) than during sham exposure. During intermittent exposure the temperature was lower than during sham exposure (difference was up to 0.11°C). Within an hour after continuous exposure, tympanic temperature was higher by 0.03°C and after intermittent exposure it was lower by 0.18°C in comparison with sham exposure. Two hours after exposure, the tympanic temperature was lower than after sham exposure (0.06°C and 0.26°C, respectively).
In conclusion, the data indicate that the physiological response to electromagnetic field exposure from the mobile phone was related to type of exposure (continuous or intermittent).

Study character:

Study funded by

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