Medical/biological study (experimental study)

The Effects of 884 MHz GSM Wireless Communication Signals on Self-reported Symptom and Sleep (EEG)- An Experimental Provocation Study.

Published in: PIERS Online 2007; 3 (7): 1148-1150

Aim of study (acc. to author)

This study was conducted to assess possible effects of prolonged (for 3 hours) exposure to 884 MHz GSM wireless communication signals on self-reported symptoms, cognitive function, and sleep.
Background/further details: The study group consisted of 36 women and 35 men (age range: 18-45 years). 22 women and 16 men reported symptoms they specifically related to mobile phone use. This group was described as electrosensitive. The rest of the participants reported no mobile phone-related symptoms. In choosing this two groups, it should be established whether electrosensitive persons would be able to differentiate exposure conditions from sham exposure.



Exposure Parameters
Exposure 1: 884 MHz
Modulation type: pulsed
Exposure duration: continuous for 3 h
Exposure 1
Main characteristics
Frequency 884 MHz
Exposure duration continuous for 3 h
Modulation type pulsed
Additional info GSM signal including periods of DTX and Non-DTX
Exposure setup
Exposure source
Chamber The exposure areas in two separate rooms were shielded with screens, covered with RF absorbing material.
Setup The exposure was directed to the left hemisphere of the head.
Sham exposure A sham exposure was conducted.
Additional info Each participant attended three different sessions, one habituation session and two subsequent exposure sessions randomly selected for sham or RF exposure.
Measurand Value Type Method Mass Remarks
SAR 1.4 W/kg mean - - -
Additional parameter details
All mobile phone use outside the exposure laboratory was eliminated during exposure sessions.
Measurement and calculation details
RF and EMF background assessments were conducted prior to the study and quarterly.
Exposed system:
  • human
  • partial body: left part of the head

Methods Endpoint/measurement parameters/methodology

Investigated material:
Investigated organ system:
Time of investigation:
  • before exposure
  • during exposure
  • after exposure

Main outcome of study (acc. to author)

Concerning sleep, there was a prolonged latency to reach the first cycle of deep sleep in exposed volunteers. The amount of deep sleep (sleep stage 4) was also decreased in exposed subjects.
Subjects who were not characterized as electrosensitive reported more headaches during exposures versus sham exposure. Neither the electrosensitive group nor the not electrosensitive group was able to detect the true exposure status.
Study character:

Study funded by

  • Mobile Manufacturers Forum (MMF), Belgium

Related articles