Study type: Medical/biological study (experimental study)

GSM radiocellular telephones do not disturb the secretion of antepituitary hormones in humans med./bio.

Published in: Bioelectromagnetics 1998; 19 (5): 271-278

Aim of study (acc. to author)

To study the effect of a 900 MHz radiofrequency irradiation emitted by a GSM (Global System for Mobile Communications) cell phone on human endocrine functions.



Exposure Parameters
Exposure 1: 890–900 MHz
Modulation type: pulsed
Exposure duration: repeated daily exposure for 2 h/day, 5 days/week, for 4 weeks
  • power: 2 W peak value
  • power: 250 mW average over time

Exposure 1

Main characteristics
Frequency 890–900 MHz
Exposure duration repeated daily exposure for 2 h/day, 5 days/week, for 4 weeks
Modulation type pulsed
Duty cycle 12.5 %
Repetition frequency 217 Hz
Exposure setup
Exposure source
Setup Listening was always performed with the same ear and at the same place in the room. The devices were only used while receiving sound but because of the missing power control system, they were always emitting at maximum power.
Additional info Subjects were their own control.
Measurand Value Type Method Mass Remarks
power 2 W peak value - - -
power 250 mW average over time - - -

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)

Findings indicated that all hormone concentrations remained within normal physiologic ranges. A difference was not revealed among the nine weekly samples in five of six hormones investigated. There was a significant change only in thyrotropin concentration (21% decrease on the seventh sampling). Because this alteration recovered during the postexposure period, it is concluded that one month of intermittent exposures to radiofrequency irradiation from a cellular telephone does not induce a long-lasting effect on the hormone secretion rate of the anterior pituitary gland in humans.

Study character:

Study funded by

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