Study type: Medical/biological study (experimental study)

Effects of thirty minutes mobile phone use on the human sensory cortex. med./bio.

Published in: Clin Neurophysiol 2006; 117 (4): 900-905

Aim of study (acc. to author)

To study whether the pulsed radiofrequency electromagnetic field emitted by a mobile phone for 30 min has short-term effects on human somatosensory evoked potentials.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 800 MHz
Modulation type: pulsed
Exposure duration: continuous for 30 min
  • power: 0.8 W peak value (simulator-controlled)
  • power: 0.27 W mean (simulator-controlled)
  • SAR: 0.054 W/kg average over mass (10 g) (± 0.02 W/kg, in the brain)

Exposure 1

Main characteristics
Frequency 800 MHz
Type
Exposure duration continuous for 30 min
Modulation
Modulation type pulsed
Pulse width 6.7 ms
Duty cycle 33.5 %
Repetition frequency 50 Hz
Additional info

usual Japanese mobile phone signal: π/4 shifted QPSK and 3 channel TDMA with a frame period of 20 ms and time slots of 6.7 ms

Exposure setup
Exposure source
Distance between exposed object and exposure source 4 cm
Setup The handset was oriented in the normal use position over the right ear with the antenna located about 4 cm from head.
Sham exposure A sham exposure was conducted.
Additional info Since the subjects were unable to hold the phone at a fixed position during the experiment, the SAR in the brain was not mathematically constant.
Parameters
Measurand Value Type Method Mass Remarks
power 0.8 W peak value cf. remarks - simulator-controlled
power 0.27 W mean cf. remarks - simulator-controlled
SAR 0.054 W/kg average over mass measured 10 g ± 0.02 W/kg, in the brain

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

30 min mobile phone use had no short-term effects on the human sensory cortex. Neither somatosensory evoked potentials nor their recovery function was affected by exposure.

Study character:

Study funded by

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