Study type: Medical/biological study (experimental study)

Effects of extremely low frequency electromagnetic fields on distortion product otoacoustic emissions in rabbits. med./bio.

Published in: Auris Nasus Larynx 2009; 36 (3): 255-262

Aim of study (acc. to author)

To study the effects of extremely low frequency electromagnetic fields on cochlear function and auditory sensation in rabbits.

Background/further details

20 female rabbits were randomly divided into two groups (each n=10): 1) exposure to 50 Hz electromagnetic fields with 5.068 kV/m; 2) exposure to 50 Hz electromagnetic field with 10.182 kV/m. DPOAE measurements were performed on the day before exposure and on day 6 and 14 after exposure.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 50 Hz
Exposure duration: continuous for 3 hr/day on 14 days

Exposure 1

Main characteristics
Frequency 50 Hz
Type
Waveform
Exposure duration continuous for 3 hr/day on 14 days
Exposure setup
Exposure source
  • copper sheets (74 cm x 50 cm x 0.2 mm) on the top and bottom of the cage
Setup 70 cm x 50 cm x 20 xm wooden cage with wooden blocks attached under it for insulation
Parameters
Measurand Value Type Method Mass Remarks
electric field strength 5.068 kV/m - calculated - at U = 2240 V
electric field strength 10.182 kV/m - calculated - at U = 4500 V
magnetic flux density 0.00218 nT - - - at U = 2240 V
magnetic flux density 0.00445 nT - - - at U = 4500 V

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)

In rabbits exposed to 5.068 kV/m (group 1), at 2 kHz the DPOAE amplitudes were significantly lower at 6 and 14 days after exposure than the values before exposure. In rabbits exposed to 10.182 kV/m (group 2), the DPOAE amplitudes were significantly increased at 2 and 4 kHz compared to before exposure. Also in group 2, at 6 kHz, amplitudes were significantly lower 14 days after exposure compared to 6 days after exposure.
The results suggest that extremely low frequency electromagnetic fields might affect hearing function. Higher exposure values caused an increase of cochlear activity.

Study character:

Study funded by

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