Study type: Medical/biological study (experimental study)

Effects of the electromagnetic field, 60 Hz, 3 microT, on the hormonal and metabolic regulation of undernourished pregnant rats. med./bio.

Published in: Braz J Biol 2009; 69 (2): 397-404
Journal not peer-reviewed

Aim of study (acc. to author)

To examine the effects of exposure to 60 Hz, 3 µT electromagnetic fields on the hormonal and metabolic regulation in pregnant rats, which were either fed a regional basic diet or a standard diet.

Background/further details

The regional basic diet (RBD) is consumed by the population of Brazil and is deficient in proteins, calories, fat, vitamins and minerals. RBD produces in rats a type of undernutrition similar to that prevalent among children of Brazil.
20 pregnant rats were divided into four groups: A) standard diet (casein, n=6); B) standard diet and exposure (n=4); C) RBD (n=6); D) RBD and exposure (n=4).

Endpoint

Exposure

Exposure Parameters
Exposure 1: 60 Hz
Exposure duration: 2 hr/day ( 1 in the morning and 1 in the afternoon) on 21 days (during pregnancy)

Exposure 1

Main characteristics
Frequency 60 Hz
Type
Waveform
Exposure duration 2 hr/day ( 1 in the morning and 1 in the afternoon) on 21 days (during pregnancy)
Exposure setup
Exposure source
Setup transformers placed under the polystyrene supports
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
magnetic flux density 3 µT - measured - -

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

Exposed rats fed with regional basic diet had significantly increased glucose release compared to the non-exposed regional basic diet group. Rats fed with regional basic diet had significantly decreased insulin and cortisol serum levels compared to rats fed with casein. The concentrations of triiodothyronine and thyroxine showed the greatest significant variations between all groups. The exposed rats fed with regional basic diet showed the lowest concentration of triiodothyronine compared to all other groups and both exposed groups showed similar concentrations of thyroxine. The relation thyroxine:triiodothyronine was most exaggerated in the exposed regional basic diet group.
The results suggest that the combination of electromagnetic fields and malnutrition leads to changes in the basal metabolism of pregnant rats.

Study character:

Study funded by

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