Study type: Medical/biological study (experimental study)

Acute mobile phones exposure affects frontal cortex hemodynamics as evidenced by functional near-infrared spectroscopy. med./bio.

Published in: J Cereb Blood Flow Metab 2009; 29 (5): 903-910

Aim of study (acc. to author)

To study the effects of an acute exposure to a GSM mobile phone signal on the hemodynamics (oxygenation) of the frontal cortex in eleven healthy volunteers.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 902.4 MHz
Modulation type: pulsed
Exposure duration: 40 min
  • power: 2 W peak value
  • SAR: 5 W/g (head)

Exposure 1

Main characteristics
Frequency 902.4 MHz
Type
Exposure duration 40 min
Modulation
Modulation type pulsed
Repetition frequency 217 Hz
Exposure setup
Exposure source
Setup phone held in the classic phoning position 1.5 cm from the left ear by a wooden construction; another phone which was turned off was positioned in the same way on the right side of the subject's head
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
power 2 W peak value - - -
SAR 5 W/g - measured partial body head

Reference articles

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

The data showed a slight influence of the GSM signal on the frontal cortex, with a linear increase in deoxyhemoglobin as a function of time indicating a local enhancement of oxygen consumption (as measured by functional near-infrared spectroscopy). No other parameter showed any GSM exposure-dependent changes. These findings suggest that functional near-infrared spectroscopy is a convenient tool for safely and non-invasively investigating the cortical activation in mobile phone exposure experimental settings. The results should be confirmed on a larger sample size.

Study character:

Study funded by

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