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Microwaves induce peripheral vasodilation squirrel monkeys.

E R Adair, B W Adams

    Science (New York, N.Y.)
    |March 21, 1980
    PubMed
    Summary
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    Microwaves trigger tail vein vasodilation in monkeys, even without raising body temperature. This suggests non-skin sensors may control thermoregulation via microwave exposure.

    Area of Science:

    • Physiology
    • Biophysics
    • Environmental Health

    Background:

    • Vasomotor activity regulates skin temperature and thermoregulation.
    • Microwave exposure effects on biological systems are not fully understood.
    • Thermoregulatory responses involve complex interactions between environmental stimuli and physiological mechanisms.

    Purpose of the Study:

    • To investigate the effect of continuous microwave exposure on cutaneous vasomotor activity.
    • To determine if microwave-induced vasodilation is mediated by direct skin heating or other mechanisms.
    • To explore the role of noncutaneous thermosensitive structures in microwave-induced thermoregulation.

    Main Methods:

    • Whole-body exposure of monkeys to 12.3-centimeter continuous microwaves.

    Related Experiment Videos

  • Measurement of local skin temperature changes in cutaneous tail veins.
  • Controlled ambient temperatures and microwave power densities were utilized.
  • Comparison with infrared exposure at equivalent power densities.

    • Main Results:

    • Microwave exposure at 8 mW/cm² initiated criterion vasodilation in tail veins at 26°C ambient temperature.
    • This microwave intensity deposited energy equivalent to 20% of resting metabolic rate without altering deep body temperature.
    • Similar responses were observed with incremental microwave power densities and reduced ambient temperatures.
    • Infrared exposure at equivalent power densities did not induce vasodilation.

    Conclusions:

    • Continuous microwave exposure can activate peripheral vasomotor responses, leading to vasodilation.
    • The findings suggest that noncutaneous thermosensitive structures may play a role in mediating microwave-induced thermoregulatory responses.
    • Microwave thermoregulation may involve mechanisms beyond simple superficial heating.