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.
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).
| 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)
|
|
| 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 source |
|
|---|---|
| Setup | transformers placed under the polystyrene supports |
| Sham exposure | A sham exposure was conducted. |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 3 µT | - | measured | - | - |
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.
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