Study type: Medical/biological study (experimental study)

The influence of electromagnetic radiation generated by a mobile phone on the skeletal system of rats. med./bio.

Published in: Biomed Res Int 2015: 896019

Aim of study (acc. to author)

The effects of exposure of rats to a 900 MHz electromagnetic field on the properties of bones and on bone metabolism parameters in the blood should be investigated.

Background/further details

20 rats were divided into the following groups (n=10 each): 1) exposure and 2) sham exposure.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 900 MHz
Exposure duration: intermittent for 15 seconds every 30 minutes, 16 times/day for 28 days
  • power density: 85.3 µW/m² spatial average (while establishing connection)
  • power density: 17 µW/m² spatial average (during active connection)
  • SAR: 0.69 W/kg maximum (according to manufacturer)

Exposure 1

Main characteristics
Frequency 900 MHz
Type
Charakteristic
Exposure duration intermittent for 15 seconds every 30 minutes, 16 times/day for 28 days
Exposure setup
Exposure source
Chamber plastic cage (56 x 35 cm ground area), rats could move freely
Setup the mobile phone, operating in silent mode and sending a fax signal to ensure a permanently active sending signal, was placed centrally under the plastic cage at a distance of 4 cm
Sham exposure A sham exposure was conducted.
Additional info sham exposure group was sham exposed for 22 h/day
Parameters
Measurand Value Type Method Mass Remarks
power density 85.3 µW/m² spatial average measured and calculated - while establishing connection
power density 17 µW/m² spatial average measured and calculated - during active connection
SAR 0.69 W/kg maximum - - according to manufacturer

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)

No significant differences regarding weight and proportions of bones could be detected between the exposure and sham exposure group.
In the tibia, the energy at the maximum bending force was significantly increased in the exposure group compared to the sham exposure group and at the same time, the stress at the maximum bending force and at fracture were significantly reduced. The authors see these results as an indication of a possible lower susceptibility of exposed bones to external forces.
The total and relative amount (ratio to the amount of phosphorus) of calcium was significantly increased in the tibia after exposure compared to the sham exposure group.
The amount of osteocalcin was significantly increased in the blood serum of exposed animals compared to the sham exposure group after 1 week of exposure, as was the amount of pyridinoline after 4 weeks of exposure.
The authors conclude that exposure of rats to a 900 MHz electromagnetic field has no impact on the macrometrical properties of bones but could alter mineralization and the bone metabolism, which in turn might alter the mechanical bone properties.

Study character:

Study funded by

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