18 pregnant (day 15-22 of gestation) and 18 non-pregnant rabbits were divided into four groups: 1) Nine pregnant not exposed animals, 2) nine pregnant exposed rabbits, 3) nine non-pregnant not-exposed rabbits, and 4) nine non-pregnant exposed animals.
|Pulse width||0.576 ms|
|Duty cycle||12.5 %|
|Repetition frequency||217 Hz|
DPOAE amplitudes were not different for exposed and not exposed pregnant animals except for 2.0 kHz (decreased in exposed animals). In group 4 (non-pregnant, exposed), DPOAE amplitudes at 1.0-4.0 kHz were lower than in group 3 (non-pregnant, not exposed rabbits). In the pregnant group, harmful effects of GSM-like radiofrequency exposure were less present than in the non-pregnant group. During pregnancy increased inner ear volume may help to reduce the damage.
The authors conclude that GSM-like radiofrequency exposure caused decreases in DPOAE amplitudes mainly in non-pregnant adult rabbits. Prolonged exposure may affect the DPOAE amplitude.