Study type: Medical/biological study (experimental study)

Psychomotor performance is not influenced by brief repeated exposures to mobile phones. med./bio.

Published in: Bioelectromagnetics 2008; 29 (3): 237-241

Aim of study (acc. to author)

To study the presence of a cumulative effect of brief and repeated exposures (3 X 15 min.) to a GSM mobile phone on psychomotor functions.

Background/further details

24 subjects participated.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 902.4 MHz
Modulation type: pulsed
Exposure duration: intermittent, 10 min off/15 min on, for 85 min

Exposure 1

Main characteristics
Frequency 902.4 MHz
Type
Exposure duration intermittent, 10 min off/15 min on, for 85 min
Modulation
Modulation type pulsed
Repetition frequency 217 Hz
Additional info

basic GSM signal with modulation components of 8.33 and 217 Hz

Exposure setup
Exposure source
Distance between exposed object and exposure source 1.5 cm
Chamber The subjects sat on an armchair at a distance of 70 cm in front of a loudspeaker inside a shielded, soundproof and temperature-controlled room.
Setup The mobile phone was held by a helmet in the normal use position (antenna oriented to the temporoparietal area) at 1.5 cm from the right ear tragus. An identical phone, but without battery, was placed on the left side of the helmet to balance the weight.
Sham exposure A sham exposure was conducted.
Additional info Each participant attended two experimental sessions, one week apart, providing either real or sham exposure in counterbalanced order and following a double-blind paradigm. Each session lasting 85 min comprised four 10-min phases of data collecting (T0-baseline, T1, T2, T3) and between them, three 15-min phases of real or sham exposure.
Parameters
Measurand Value Type Method Mass Remarks
power 2 W peak value - - -
power 0.25 W mean - - -
SAR 0.5 W/kg maximum measured 10 g at the temporal lobe

Reference articles

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

The data showed no cumulative effects of brief and repeated electromagnetic field exposure on human psychomotor performance, although there was a non-statistical trend to shorter reaction times. In conclusion, these findings show an absence of effects with these particular exposure conditions.

Study character:

Study funded by

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