Study type: Medical/biological study (experimental study)

Auditory brainstem response changes during exposure to GSM-900 radiation: an experimental study. med./bio.

Published in: Audiol Neurootol 2011; 16 (4): 270-276

Aim of study (acc. to author)

To study the possible electrophysiological time-related changes in auditory pathway in rabbits (n=28) during mobile phone electromagnetic field exposure.

Background/further details

Absolute wave latency as well as interwave latency data were measured at 1, 15, 30, 45 and 60 min during exposure.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 903 MHz
Exposure duration: continuous for 60 min
  • power: 219 mW average over time (at 903 MHz)
  • power: 0.865 mW average over time (for the second harmonics at 1806 MHz)
  • power: 0.018 mW average over time (for the third harmonics at 2709 MHz)
  • power: 0.22 W average over time (typical value for a cell phone under favorable conditions)

Exposure 1

Main characteristics
Frequency 903 MHz
Type
Waveform
Exposure duration continuous for 60 min
Exposure setup
Exposure source
  • monopole
Setup radio transmitter for GSM 900 simulation connected to a 8 cm long wire antenna (λ/4 monopol antenna); antenna placed in the entrance of the external auditory bony canal of the rabbit
Parameters
Measurand Value Type Method Mass Remarks
power 219 mW average over time - - at 903 MHz
power 0.865 mW average over time - - for the second harmonics at 1806 MHz
power 0.018 mW average over time - - for the third harmonics at 2709 MHz
power 0.22 W average over time - - typical value for a cell phone under favorable conditions

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 exposure to electromagnetic fields emitted by mobile phones can affect the normal electrophysiological activity of the auditory system in rabbits. This effect became detectable by auditory brainstem response recordings ipsilaterally to the side exposed to the electromagnetic field. The main finding was prolongation of interwave latencies I-V and III-V at 30 min of exposure time, while recordings from the contralateral side did not show this effect even after 60 min. The mean absolute latency of waves III-V showed a statistically significant delay after 60, 45 and 15 min of exposure to the electromagnetic field of 900 MHz. The auditory brainstem response measurements returned to baseline recordings 24 h after the exposure.

Study character:

Study funded by

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