The effects of hyperthermia and hyperthermia plus microwaves on rat brain energy metabolism.


Journal Article

The effects of hyperthermia, alone and in conjunction with microwave exposure, on brain energetics were studied in anesthetized male Sprague-Dawley rats. The effect of temperature on adenosine triphosphate concentration [ATP] and creatine phosphate concentration [CP] was determined in the brains of rats that were maintained at 35.6, 37.0, 39.0, and 41.0 degrees C. At 37, 39, and 41 degrees C brain [ATP] and [CP] were down 6.0, 10.8, and 29.2%, and 19.6, 28.7, and 44%, respectively, from the 35.6 degrees C control concentrations. Exposure of the brain to 591-MHz radiation at 13.8 mW/cm2 for 0.5, 1.0, 3.0, and 5.0 min caused further decreases (below those observed for 30 degrees C hyperthermia only) of 16.0, 29.8, 22.5, and 12.3% in brain [ATP], and of 15.6, 25.1, 21.4, and 25.9% in brain [CP] after 0.5, 1.0, 3.0, and 5.0 min, respectively. Recording of brain reduced nicotinamide adenine dinucleotide (NADH) fluorescence before, during, and after microwave exposure showed an increase in NADH fluorescence during microwave exposure that returned to preexposure levels within 1 min postexposure. Continuous recording of brain temperatures during microwave exposures showed that brain temperature varied between -0.1 and +0.05 degrees C. Since the microwave exposures did not induce tissue hyperthermia, it is concluded that direct microwave interaction at the subcellular level is responsible for the observed decrease in [ATP] and [CP].

Full Text

Duke Authors

Cited Authors

  • Sanders, AP; Joines, WT

Published Date

  • 1984

Published In

Volume / Issue

  • 5 / 1

Start / End Page

  • 63 - 70

PubMed ID

  • 6712750

Pubmed Central ID

  • 6712750

International Standard Serial Number (ISSN)

  • 0197-8462

Digital Object Identifier (DOI)

  • 10.1002/bem.2250050107


  • eng

Conference Location

  • United States