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Title: Minimal changes in hypothalamic temperature accompany microwave-induced alteration of thermoregulatory behavior

Abstract

This study probed the mechanisms underlying microwave-induced alterations of thermoregulatory behavior. Adult male squirrel monkeys (Saimiri sciureus), trained to regulate the temperature of their immediate environment (Ta) behaviorally, were chronically implanted with Teflon reentrant tubes in the medical preoptic/anterior hypothalamic area (PO/AH), the brainstem region considered to control normal thermoregulatory processes. A Vitek temperature probe inserted into the tube measured PO/AH temperature continuously while changes in thermoregulatory behavior were induced by either brief (10-min) or prolonged (2.5-h) unilateral exposures to planewave 2,450-MHz continuous wave (CW) microwaves (E polarization). Power densities explored ranged from 4 to 20 mW/cm2 (rate of energy absorption (SAR) . 0.05 (W/kg)/cm2)). Rectal temperature and four representative skin temperatures were also monitored, as was the Ta selected by the animal. When the power density was high enough to induce a monkey to select a cooler Ta (8 mW/cm2 and above), PO/AH temperature rose approximately 0.3 degrees C but seldom more. Lower power densities usually produced smaller increases in PO/AH temperature and no reliable change in thermoregulatory behavior. Rectal temperature remained constant while PO/AH temperature rose only 0.2-0.3 degrees C during 2.5-h exposures at 20 mW/cm2 because the Ta selected was 2-3 degrees C cooler than normally preferred.more » Sometimes PO/AH temperature increments greater than 0.3 degrees C were recorded, but they always accompanied inadequate thermoregulatory behavior. Thus, a PO/AH temperature rise of 0.2-0.3 degrees C, accompanying microwave exposure, appears to be necessary and sufficient to alter thermoregulatory behavior, which ensures in turn that no greater temperature excursions occur in this hypothalamic thermoregulatory center.« less

Authors:
; ;
Publication Date:
Research Org.:
John B. Pierce Foundation Laboratory, New Haven, Connecticut
OSTI Identifier:
6902772
Resource Type:
Journal Article
Journal Name:
Bioelectromagnetics (N.Y.); (United States)
Additional Journal Information:
Journal Volume: 5:1
Country of Publication:
United States
Language:
English
Subject:
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.; HYPOTHALAMUS; BODY TEMPERATURE; MICROWAVE RADIATION; BIOLOGICAL EFFECTS; MONKEYS; THERMOREGULATION; ANIMALS; BODY; BRAIN; CENTRAL NERVOUS SYSTEM; CONTROL; ELECTROMAGNETIC RADIATION; MAMMALS; NERVOUS SYSTEM; ORGANS; PRIMATES; RADIATIONS; TEMPERATURE CONTROL; VERTEBRATES; 560400* - Other Environmental Pollutant Effects

Citation Formats

Adair, E R, Adams, B W, and Akel, G M. Minimal changes in hypothalamic temperature accompany microwave-induced alteration of thermoregulatory behavior. United States: N. p., 1984. Web. doi:10.1002/bem.2250050103.
Adair, E R, Adams, B W, & Akel, G M. Minimal changes in hypothalamic temperature accompany microwave-induced alteration of thermoregulatory behavior. United States. doi:10.1002/bem.2250050103.
Adair, E R, Adams, B W, and Akel, G M. Sun . "Minimal changes in hypothalamic temperature accompany microwave-induced alteration of thermoregulatory behavior". United States. doi:10.1002/bem.2250050103.
@article{osti_6902772,
title = {Minimal changes in hypothalamic temperature accompany microwave-induced alteration of thermoregulatory behavior},
author = {Adair, E R and Adams, B W and Akel, G M},
abstractNote = {This study probed the mechanisms underlying microwave-induced alterations of thermoregulatory behavior. Adult male squirrel monkeys (Saimiri sciureus), trained to regulate the temperature of their immediate environment (Ta) behaviorally, were chronically implanted with Teflon reentrant tubes in the medical preoptic/anterior hypothalamic area (PO/AH), the brainstem region considered to control normal thermoregulatory processes. A Vitek temperature probe inserted into the tube measured PO/AH temperature continuously while changes in thermoregulatory behavior were induced by either brief (10-min) or prolonged (2.5-h) unilateral exposures to planewave 2,450-MHz continuous wave (CW) microwaves (E polarization). Power densities explored ranged from 4 to 20 mW/cm2 (rate of energy absorption (SAR) . 0.05 (W/kg)/cm2)). Rectal temperature and four representative skin temperatures were also monitored, as was the Ta selected by the animal. When the power density was high enough to induce a monkey to select a cooler Ta (8 mW/cm2 and above), PO/AH temperature rose approximately 0.3 degrees C but seldom more. Lower power densities usually produced smaller increases in PO/AH temperature and no reliable change in thermoregulatory behavior. Rectal temperature remained constant while PO/AH temperature rose only 0.2-0.3 degrees C during 2.5-h exposures at 20 mW/cm2 because the Ta selected was 2-3 degrees C cooler than normally preferred. Sometimes PO/AH temperature increments greater than 0.3 degrees C were recorded, but they always accompanied inadequate thermoregulatory behavior. Thus, a PO/AH temperature rise of 0.2-0.3 degrees C, accompanying microwave exposure, appears to be necessary and sufficient to alter thermoregulatory behavior, which ensures in turn that no greater temperature excursions occur in this hypothalamic thermoregulatory center.},
doi = {10.1002/bem.2250050103},
journal = {Bioelectromagnetics (N.Y.); (United States)},
number = ,
volume = 5:1,
place = {United States},
year = {1984},
month = {1}
}