Study type: Medical/biological study (experimental study)

No effects of 900 MHz and 1800 MHz electromagnetic field emitted from cellular phone on nocturnal serum melatonin levels in rats. med./bio.

Published in: Toxicol Ind Health 2005; 21 (1-2): 27-31

Aim of study (acc. to author)

To study the effects of exposure to a 900 MHz and 1800 MHz electromagnetic field on serum nocturnal melatonin levels of adult male rats.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 900 MHz
Modulation type: CW
Exposure duration: repeated daily exposure, 30 min/day, 5 days/week for 4 weeks
Exposure 2: 1,800 MHz
Modulation type: CW
Exposure duration: repeated daily exposure, 30 min/day, 5 days/week for 4 weeks

Exposure 1

Main characteristics
Frequency 900 MHz
Type
Exposure duration repeated daily exposure, 30 min/day, 5 days/week for 4 weeks
Modulation
Modulation type CW
Exposure setup
Exposure source
Chamber The exposure system consisted of a ventilated round plastic tube cage (12 cm long, 5.5 cm in diameter) and a half-wave dipole antenna.
Setup The rat was positioned above the dipole antenna with a small distance to it.
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
power density 1 mW/cm² mean measured - ± 0.4 mW/cm²
SAR 2 W/kg peak value - - -

Exposure 2

Main characteristics
Frequency 1,800 MHz
Type
Exposure duration repeated daily exposure, 30 min/day, 5 days/week for 4 weeks
Modulation
Modulation type CW
Exposure setup
Exposure source
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
power density 1 mW/cm² mean measured - ± 0.4 mW/cm²
SAR 2 W/kg peak value - - -

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

There were no statistically significant differences in melatonin concentrations between the 900 MHz electromagnetic field exposed group and the sham-exposed group. Also, there were no statistically significant differences in melatonin concentrations between the sham-exposed group and the 1800 MHz-exposed group.
These findings indicate that mobile phones, emitting 900 and 1800 MHz electromagnetic fields, have no effect on nocturnal serum melatonin levels in rats.

Study character:

Study funded by

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