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To study the effect of one hour daily exposure to electromagnetic fields with a frequency of 900 MHz on the levels of amino acid neurotransmitters in the midbrain, cerebellum and medulla of adult (four month) and young (one month) male rats.
The determination of amino acid levels was carried out after one hour of exposure and following one, two and four months of exposure as well as one month after termination of exposure of four months. The subgroups of the different removed animal groups comprised 5-8 animals.
The data showed a significant increase in both excitatory and inhibitory amino acids in the cerebellum of adult and young rats as well as in the midbrain of adult animals after one hour of electromagnetic field exposure. In the midbrain of adult animals, there were significant increases in the glycine level (after one month) and in the GABA level (after one hour and four months).
Young rats showed significant decreases in the midbrain excitatory amino acids.
In the medulla, the data showed a state of neurochemical inhibition in adult animals after four months, whereas in young animals, the neurochemical inhibitory state was observed after one month of exposure due to significant decreases in glutamate and aspartate levels. This state was converted to an excitation state after 4 months due to the increase in glutamate level.
The authors conclude that the changes in amino acid concentrations may underlie adverse effects of mobile phone use.