18 infant rabbits (one month old) and 18 adult rabbits (13 months old) were randomly divided into four groups (each n=9): 1) infant control group; 2) infant exposure group; 3) adult control group; 4) adult exposure group. All groups were compared with each other.
|Exposure duration||continuous for 15 min/day on 7 days|
|Pulse width||0.576 ms|
|Duty cycle||12.5 %|
|Repetition frequency||217 Hz|
The data showed that the mean DPOAE amplitudes of the adult exposure group were significantly lower than the values of the other three groups. The mean DPOAE amplitudes of the infant exposure group were significantly higher than those of the other three groups.
Harmful effects of GSM-like 1800 MHz radiofrequency exposure were detected more in the adult female rabbits than infant female rabbits. Prolonged exposure and related temperature increase in the ear canal may decrease the DPOAE amplitudes. Water containing medium in the middle ear of infant rabbits may play a protective role from radiofrequency damage.