Study type: Medical/biological study (experimental study)

The influence of electromagnetic fields on human brain activity. med./bio.

Published in: Eur J Med Res 1995; 1 (1): 27-32

Aim of study (acc. to author)

To study possible effects of electromagnetic fields on human brain activity.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 902.4 MHz
Modulation type: pulsed
Exposure duration: continuous for 15 min
Exposure 2: 150 kHz
Modulation type: pulsed
Exposure duration: continuous for 15 min

General information

In this single-blind, cross-over designed study, subjects were exposed to three different exposure conditions with at least one day between sessions: digital mobile telephone (T), "MEGA-WAVE" therapy instrument (M) (positive control), and no field exposure = placebo (P). Each volunteer had to go through one of the following sequences: P/M/T, T/P/M, M/T/P, P/T/M, M/P/T or T/M/P. All permutations occurred randomized and with the same frequency.

Exposure 1

Main characteristics
Frequency 902.4 MHz
Type
Exposure duration continuous for 15 min
Modulation
Modulation type pulsed
Repetition frequency 217 Hz
Additional info

D-network

Exposure setup
Exposure source
Distance between exposed object and exposure source 40 cm
Chamber Subjects were seated in a comfortable armchair in a well ventilated room.
Setup The mobile phone was placed 40 cm behind the subject's head with the antenna being centred.
Additional info Each single session lasted one hour and six min with breaks of 2 min every 15 min and exposure (if any) only in the second quarter. The instruments remained in position and were switched on or off during breaks.
Parameters
Measurand Value Type Method Mass Remarks
power 8 W - - - -

Exposure 2

Main characteristics
Frequency 150 kHz
Type
Waveform
Exposure duration continuous for 15 min
Modulation
Modulation type pulsed
Pulse width 80 µs
Repetition frequency 9.6 Hz
Additional info

off-pulses

Exposure setup
Exposure source
  • MEGA-WAVE 150/1
Distance between exposed object and exposure source 3 cm
Setup The magnetic applicator (coil) of the MEGA-WAVE was positioned just below the occipital electrodes O1 and O2 in the centre, 3 to 5 cm from the skin.
Parameters
Measurand Value Type Method Mass Remarks
magnetic flux density 0.4 nT - - - -

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

Application of the MEGA-WAVE instrument caused an increase in EEG power in the frequency bands Alpha2, Beta1 and Beta2 during and after irradiation. Operation of the mobile telephone caused an increase in the same frequency bands with a delay of approximately 15 minutes after irradiation.

Study character:

Study funded by

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