To assess potential changes in hearing function as a consequence of exposure to low-intensity electromagnetic fields produced by mobile phones.
| Frequency | 900 MHz |
|---|---|
| Type | |
| Exposure duration | continuous for 10 min |
| Modulation type | pulsed |
|---|
| Exposure source |
|
|---|---|
| Chamber | Sound-treated booth of 2.5 m x 2 m |
| Setup | The mobile phone was fixed to the tested ear using a special headband and positioning system (all parts made from non-metallic plastic materials), so that the centre of the radiated field should be over the entrance of the external ear canal. Participants were simultaneously exposed to GSM radiation and an acoustic stimulus. |
| Additional info | Participants attended two sessions on separate days with genuine or sham exposure, double-blind and counterbalanced in order. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| power | 2 W | - | measured | - | - |
Statistical analysis revealed no significant differences in the mean shift of pure-tone audiometry and transient evoked otoacoustic emission (TEOAE) values before and after genuine and/or sham mobile phone electromagnetic field exposure.
The authors concluded that a 10-min close exposure of electromagnetic fields emitted from a mobile phone had no immediate after-effect on measurements of hearing threshold level on pure-tone audiometry and transient evoked otoacoustic emissions. No measurable hearing deterioration was detected.
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