この研究は、環境温度（Ta）を行動的に調節することを訓練されたリスザル（Saimiri sciureus）に、ホーンアンテナからの遠方界の2450MHz CWマイクロ波ばく露を10分間与え、行動を観察した。入射電力密度は1〜22mW / cm2の範囲であった。比吸収率（SAR）は、0.15〜3.25W / kgの範囲と推定された。対照群は、入射エネルギーが等価の赤外放射ばく露を与えた。その結果、通常の熱制御行動においては、ほとんどのサルは34〜36℃のTaを選択した；6〜8mW / cm 2の入射電力密度でのマイクロ波の10分間ばく露により、すべての動物により低いTaを選択するようになった；この閾値エネルギーは、1.1W / kgの全身SARで表されたが、これはサルの安静時代謝率の約20％に相当する；体温調節行動は非常に効率的であり、22mW / cm2であっても（この場合、好ましいTaは4℃も下がるが）、皮膚および直腸の温度は安定していた、と報告している。
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Squirrel monkeys trained to regulate environmental temperature behaviorally were irradiated in the far field of 2450 MHz continuous wave microwaves. The monkeys learned to control the temperature of the circulating chamber air by selecting between cold (15°C) and warm (55°C) air sources.
The aim of the study was to determine 1) the minimal incident power density that will reliably alter the ongoing thermoregulatory behavior of monkeys, 2) the nature of the alteration, and 3) the degree to which this effect may be attributed to peripheral heating. Controls included exposure to infrared radiation equivalent incident energy and no irradiation exposure.
|Distance between exposed object and exposure source||1.85 m|
|チャンバの詳細||Anechoic chamber/ 1.83 m x 1.83 m x 2.45 m|
|ばく露装置の詳細||Monkeys were retrained in a chair which was mounted on a TV antenna rotor|
|Additional information||A valve system allowed air from one of two closely regulated sources to circulate through the chamber. The monkey was trained to pull a cord to operate the valves hence it was able to select the air temperature between 15 to 55°C. During exposure the preferred temperature by the monkey was 35-36°C. Control animals were exposed to 10 min of infrared radiation to same the intensities as used for microwave exposure.|
Most monkeys selected an environmental temperature of 34-36°C. 10-minute exposures to 2450 MHz continuous wave microwaves at an incident power density of 6-8 mW/cm² stimulated all monkeys to select a lower environmental temperature. This threshold energy represents a whole-body SAR of 1.1 W/kg. Thermoregulatory behavior was highly efficient: skin and rectal temperatures remained stable, even at 22 mW/cm² where the preferred environmental temperature was lowered by as much as 4°C. No comparable reduction in selected environmental temperature below control levels occurred during exposure to infrared radiation of equal incident power density.