Study type: Medical/biological study (experimental study)

Mobile phone 'talk-mode' signal delays EEG-determined sleep onset. med./bio.

Published in: Neurosci Lett 2007; 421 (1): 82-86

Aim of study (acc. to author)

This in vivo study was performed to study the effects of GSM exposure in different modes (talk, listen, standby mode, and sham exposure) on human sleep onset.

Background/further details

10 healthy, unmedicated, normal sleeping behaviour, right-handed men (age: 18-28 years) participated in this study.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 900 MHz
Modulation type: pulsed
Exposure duration: continuous for 30 min
  • SAR: 0.133 mW/g average over mass (10 g) (DASY4)
Exposure 2: 900 MHz
Modulation type: pulsed
Exposure duration: continuous for 30 min
  • SAR: 0.015 mW/g average over mass (10 g) (DASY4)
Exposure 3: 900 MHz
Modulation type: pulsed
Exposure duration: continuous for 30 min
  • SAR: 0.001 mW/g average over mass (10 g) (DASY4)

General information

At precisely weekly intervals, participants were exposed to one of the talk, listen, standby, and sham (nil signal) modes, with the exposure orders single-blind, random, and counterbalanced between participants.

Exposure 1

Main characteristics
Frequency 900 MHz
Type
Exposure duration continuous for 30 min
Modulation
Modulation type pulsed
Additional info

GSM talk mode with 8 and 217 Hz ELF components

Exposure setup
Exposure source
Chamber The participants lay on a comfortable bed, in an individual sound-proof and lit bedroom, remained silent, and fixed their eyes on a wall marker.
Setup A thermally and acoustically insulated silent phone (speaker disabled) was positioned beside the right ear.
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
SAR 0.133 mW/g average over mass measured 10 g DASY4

Exposure 2

Main characteristics
Frequency 900 MHz
Type
Exposure duration continuous for 30 min
Modulation
Modulation type pulsed
Additional info

GSM listen mode with 2, 8, and 217 Hz ELF components

Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
SAR 0.015 mW/g average over mass measured 10 g DASY4

Exposure 3

Main characteristics
Frequency 900 MHz
Type
Exposure duration continuous for 30 min
Modulation
Modulation type pulsed
Additional info

GSM standby mode with 1-32 Hz ELF components

Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
SAR 0.001 mW/g average over mass measured 10 g DASY4

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Investigated organ system:
Time of investigation:
  • after exposure

Main outcome of study (acc. to author)

The sleep onset latency after the mobile phone exposure in talk mode was significantly delayed compared to the exposure group in listen mode and the sham exposure.

Study character:

Study funded by

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