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.
|Setup||70 cm x 50 cm x 20 xm wooden cage with wooden blocks attached under it for insulation|
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.