Medical/biological study (experimental study)

GSM phone signal does not produce subjective symptoms med./bio.

By: Koivisto M, Haarala C, Krause CM, Revonsuo A, Laine M, Hämäläinen H

Published in: Bioelectromagnetics 2001; 22 (3): 212-215

Aim of study (acc. to author)

The influence of pulsed radiofrequency electromagnetic fields of digital GSM mobile phones on subjective symptoms or sensations in healthy subjects was studied.

Endpoint

hypersensitivity/subjective complaints: subjective symptoms or sensations

Exposure

- mobile communications
- digital mobile phone
- GSM

Exposure	Parameters
Exposure 1: 902 MHz Modulation type: pulsed Exposure duration: 1 session of 30 min or 2 sessions of 60 min each separated by 24 h	power: 0.25 W mean

Exposure 1

Main characteristics

Frequency	902 MHz
Type	electromagnetic field
Exposure duration	1 session of 30 min or 2 sessions of 60 min each separated by 24 h

Modulation

Modulation type	pulsed
Pulse width	577 µs
Repetition frequency	217 Hz
Additional info	discontinuous transmission mode not activated

Exposure setup

Exposure source	cellular phone
Distance between exposed object and exposure source	4 cm
Setup	GSM phone attached to the subject's head in a position simulating the normal position for use, without direct contact with the skin; antenna positioned over the posterior areas of the left hemisphere
Sham exposure	A sham exposure was conducted.

Parameters

Measurand	Value	Type	Method	Mass	Remarks
power	0.25 W	mean	-	-	-

Exposed system:

human
partial body: head (left side)

Methods Endpoint/measurement parameters/methodology

hypersensitivity/subjective complaints: subjective symptoms or sensations (questionnaire)

Investigated system:

investigation on living organism

Time of investigation:

during exposure
after exposure

Main outcome of study (acc. to author)

The results did not reveal any differences between exposure and sham exposure conditions, suggesting that a 30-60 min exposure to this radiofrequency field does not produce subjective symptoms in humans.

Study character:

medical/biological study
experimental study
full/main study
blind study

Study funded by

Nokia
University of Turku, Finland

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