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Abstract
BackgroundThere are about 1.6 billion GSM cellular phones in use throughout the world today. Numerous papers have reported various biological effects in humans exposed to electromagnetic fields emitted by mobile phones. The aim of the present study was to advance our understanding of potential adverse effects of the GSM mobile phones on the human hearing system.MethodsAuditory Brainstem Response (ABR) was recorded with three non-polarizing Ag-AgCl scalp electrodes in thirty young and healthy volunteers (age 18–26 years) with normal hearing. ABR data were collected before, and immediately after a 10 minute exposure to 900 MHz pulsed electromagnetic field (EMF) emitted by a commercial Nokia 6310 mobile phone. Fifteen subjects were exposed to genuine EMF and fifteen to sham EMF in a double blind and counterbalanced order. Possible effects of irradiation was analyzed by comparing the latency of ABR waves I, III and V before and after genuine/sham EMF exposure.ResultsPaired sample t-test was conducted for statistical analysis. Results revealed no significant differences in the latency of ABR waves I, III and V before and after 10 minutes of genuine/sham EMF exposure.ConclusionThe present results suggest that, in our experimental conditions, a single 10 minute exposure of 900 MHz EMF emitted by a commercial mobile phone does not produce measurable immediate effects in the latency of auditory brainstem waves I, III and V.
Highlights
There are about 1.6 billion GSM cellular phones in use throughout the world today
A significant delay in the latency of the fifth wave (V) of the auditory brainstem response (ABR) after 15 min of exposure to electromagnetic field (EMF) emitted by a GSM mobile phones (MPs) was recorded [2] and the authors suggested that the observed delay might lead to a temporary 15–18 dB hearing deficiency above 2 kHz in the normal hearing frequency range
These results suggest that a single 10 minute exposure to EMF emitted by a MP has no immediate effects on hearing threshold levels
Summary
There are about 1.6 billion GSM cellular phones in use throughout the world today. Numerous papers have reported various biological effects in humans exposed to electromagnetic fields emitted by mobile phones. Investigation of hearing threshold levels by pure tone audiometry and transient evoked otoacoustic emissions before and immediately after 10 min of genuine or sham exposure of MP EMF yielded no significant effect caused by the irradiation [5] These results suggest that a single 10 minute exposure to EMF emitted by a MP has no immediate effects on hearing threshold levels. A more recent study from the same group [7] investigated the possible effects of 30 min MP EMF on auditory and visual evoked responses in 120 normal subjects In this followup study, previous positive findings were not replicated and the authors concluded that there was no evidence for any effects of acute MP EMF exposure on event-related brain potentials and reaction time in humans. The authors observed a significant effect of EMF exposure on the P50 component, whereas in their study memory performance was not affected by EMF exposure
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