Low-level microwave irradiation and central cholinergic activity: a dose-response study
Rats were irradiated with circularly polarized, 2,450-MHz pulsed microwaves (2-microseconds pulses, 500 pulses per second (pps)) for 45 min in the cylindrical waveguide system of Guy et al. Immediately after exposure, sodium-dependent high-affinity choline uptake, an indicator of cholinergic activity in neural tissue, was measured in the striatum, frontal cortex, hippocampus, and hypothalamus. The power density was set to give average whole-body specific absorption rates (SAR) of 0.3, 0.45, 0.6, 0.75, 0.9, or 1.2 W/kg to study the dose-response relationship between the rate of microwave energy absorption and cholinergic activity in the different areas of the brain. Decrease in choline uptake was observed in the striatum at a SAR of 0.75 W/kg and above, whereas for the frontal cortex and hippocampus, decreases in choline uptake were observed at a SAR of 0.45 W/kg and above. No significant effect was observed in the hypothalamus at the irradiation power densities studied. The probit analysis was used to determine the SAR50 in each brain area, i.e., the SAR at which 50% of maximum response was elicited. SAR50 values for the striatum, frontal cortex, and hippocampus were 0.65, 0.38, and 0.44 W/kg, respectively.
- Research Organization:
- Univ. of Washington School of Medicine, Seattle (USA)
- OSTI ID:
- 6065111
- Journal Information:
- Bioelectromagnetics (N.Y.); (United States), Vol. 10:2
- Country of Publication:
- United States
- Language:
- English
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BRAIN
SENSITIVITY
CHOLINE
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MICROWAVE RADIATION
BIOLOGICAL EFFECTS
DOSE-RESPONSE RELATIONSHIPS
MHZ RANGE
RATS
ALCOHOLS
AMINES
AMMONIUM COMPOUNDS
ANIMALS
BODY
CENTRAL NERVOUS SYSTEM
DRUGS
ELECTROMAGNETIC RADIATION
FREQUENCY RANGE
HYDROXY COMPOUNDS
LIPOTROPIC FACTORS
MAMMALS
NERVOUS SYSTEM
ORGANIC COMPOUNDS
ORGANS
QUATERNARY COMPOUNDS
RADIATIONS
RODENTS
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