To assess potential subtle changes in cochlear function by measuring transient evoked otoacoustic emissions (TEOAEs) in normal hearing subjects after exposure to electromagnetic fields emitted by GSM mobile phones.
TEOAEs were recorded in 27 healthy young adults before and after 10 min of real exposure or sham exposure.
Half of the participants were exposed at 900 MHz and 1800 MHz, respectively.
Frequency | 900 MHz |
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Type | |
Exposure duration | continuous for 10 min |
Exposure source |
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Setup | The phone was positioned in accordance with CENELEC standard EN 50361 by a system consisting of three main parts, all made of non-metallic plastic materials: a headband, an adjustable arm and a phone holder attached to a bracket glued to the battery pack of the phone. |
Sham exposure | A sham exposure was conducted. |
Additional info | The procedure was performed twice in a double-blind design on separate days (at least 24 h apart). A 50 Ω resistive load and an open-circuit dummy load were connected to the remote antenna connector of the phone for sham and real exposure, respectively. The effectiveness of the load was confirmed by near field surface scanning of the phone. |
Frequency | 1,800 MHz |
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Type | |
Exposure duration | continuous for 10 min |
Exposure source |
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Sham exposure | A sham exposure was conducted. |
The data show that there is no measurable effect on transient evoked otoacoustic emissions (TEOAEs) immediately after a 10 min exposure at the maximum power of a GSM mobile phone, neither when TEOAEs were analyzed across the entire frequency range nor when analyzed in their time-frequency fine structure.
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