Study type: Medical/biological study (experimental study)

Effect of modulated at different low frequencies microwave radiation on human EEG. med./bio.

Published in: Environmentalist 2009; 29 (2): 215-219

Aim of study (acc. to author)

To study whether the effect of low-level microwave irradiation on human brain differs at different modulation frequencies.

Background/further details

The 450 MHz microwave exposure modulated at 40 and 70 Hz (15 subjects) and 217 and 1,000 Hz (19 subjects) frequencies was applied. The data of previous studies at 7, 14 and 21 Hz modulation were included into the analysis (Hinrikus et al. 2008a and Hinrikus et al. 2008b).

Endpoint

Exposure

Exposure Parameters
Exposure 1: 450 MHz
Modulation type: pulsed
Exposure duration: 40 min
Exposure 2: 450 MHz
Modulation type: pulsed
Exposure duration: 40 min

Exposure 1

Main characteristics
Frequency 450 MHz
Type
Exposure duration 40 min
Modulation
Modulation type pulsed
Duty cycle 50 %
Additional info

fmod1 = 40 Hz, fmod2 = 70 Hz pulse 1 min on - 1 min off - repeated 10 times with fmod1 and 10 times withfmod2

Exposure setup
Exposure source
Distance between exposed object and exposure source 10 cm
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
power 1 W - - - -
power density 0.16 mW/cm² spatial average estimated - -

Exposure 2

Main characteristics
Frequency 450 MHz
Type
Exposure duration 40 min
Modulation
Modulation type pulsed
Duty cycle 50 %
Additional info

fmod1 = 217 Hz, fmod2 = 1000 Hz pulse 1 min on - 1 min off - repeated 10 times with fmod1 and 10 times withfmod2

Exposure setup
Exposure source
Distance between exposed object and exposure source 10 cm
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
power 1 W - - - -
power density 0.16 mW/cm² spatial average estimated - -

Reference articles

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

The data showed that microwave exposure increased the EEG energy at EEG frequencies lower or close to the modulation frequency (different modulation frequencies affected different EEG frequency bands). No effect was detected at EEG frequencies higher than the modulation frequency. Statistically significant alterations were caused by exposure in the EEG alpha wave and beta wave frequency bands; no significant effect was found in the theta wave frequency band.
The results suggest that telecommunication devices with complex spectrum of modulation frequencies like mobile phones can affect human EEG frequency bands.

Study character:

Study funded by

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