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Microwaves modify thermoregulatory behavior in squirrel monkey

E R Adair, B W Adams

    Bioelectromagnetics
    |January 1, 1980
    PubMed
    Summary
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    Microwave exposure triggered behavioral thermoregulation in squirrel monkeys, causing them to lower their preferred environmental temperature. This thermoregulatory response occurred even at low specific absorption rates (SAR), demonstrating efficient biological adaptation to radiofrequency energy.

    Area of Science:

    • Environmental Science
    • Animal Behavior
    • Biophysics

    Background:

    • Squirrel monkeys exhibit precise thermoregulatory behavior, typically selecting an environmental temperature (Ta) between 34-36°C.
    • Understanding the impact of non-ionizing radiation on mammalian thermoregulation is crucial for safety assessments.

    Purpose of the Study:

    • To investigate the behavioral thermoregulatory responses of squirrel monkeys exposed to 2,450 MHz continuous wave (CW) microwaves.
    • To determine the threshold for microwave-induced thermoregulatory adjustments and compare it to infrared radiation effects.

    Main Methods:

    • Squirrel monkeys were trained to behaviorally regulate Ta and exposed to 2,450 MHz CW microwaves (1-22 mW/cm²) or equivalent infrared radiation.
    • Specific absorption rate (SAR) was estimated using saline-filled models.

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  • Control groups included sham exposure and infrared radiation exposure.

    • Main Results:

    • Microwave exposure at 6-8 mW/cm² (whole-body SAR of 1.1 W/kg) induced a significant decrease in the selected Ta.
    • Thermoregulatory behavior remained efficient, maintaining stable skin and rectal temperatures even at higher microwave power densities (22 mW/cm²).
    • Infrared radiation of equivalent power density did not elicit a comparable reduction in selected Ta.

    Conclusions:

    • Behavioral thermoregulation in squirrel monkeys is sensitive to 2,450 MHz CW microwaves at relatively low SAR levels.
    • Microwave-induced thermoregulatory effects are distinct from those of thermal radiation at equivalent power densities.
    • These findings highlight the potential for non-thermal biological effects of radiofrequency energy on mammalian physiology.