Medical/biological Study (experimental study)

Effects of GSM Cellular Phones on Human Hearing: The European Project "GUARD". med./biol.

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Aim of study (according to author)
To study the possible effects of exposure to GSM-modulated electromagnetic fields (at both 900 MHz and 1800 MHz) on the hearing system of humans.
Background/further details:
169 subjects participated. The procedure was conducted twice: once with electromagnetic field exposure and once with sham exposure (at least 24 h apart).

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Endpoint

• auditory function

Comment on Endpoints (up to 2000 characters):

Exposure
General category: mobile communication system, digital mobile phone, GSM

Field characteristics	Parameters
field 1: 900 MHz pulsed (PW) exposure duration: continuous for 10 min	power: 2 W SAR: 0.41 W/kg max value (1 g)
field 2: 1800 MHz pulsed (PW) exposure duration: continuous for 10 min	power: 1 W SAR: 0.19 W/kg max value (1 g)

FIELD View further expo parameters

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Exposed system:
human
partial body exposure: ear

Comment on exposed system (up to 2000 characters):

Methods
Endpoint/Measurement parameters/Methodology

• auditory function (hearing threshold level, transient evoked otoacoustic emissions (TEOAE), distortion product otoacoustic emissions (DPOAE), auditory brainstem response (ABR))

investigation on living organism
investigated organ systems: sense organs, brain/CNS, ear

time of investigation: before and after exposure

Comment on methods (up to 2000 characters):

Main outcome of study (according to author)
No effects of exposure to GSM mobile phone signals on the main measures of the status of the auditory system were found.

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(Study character: medical/biological study, experimental study, full/main study, double-blind study)

General comment on article (up to 2000 characters):

Study funded by

• European Project GUARD ("Potential adverse effects of GSM cellular phones on hearing")

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