研究のタイプ: 医学/生物学の研究 (experimental study)

[マイクロ波はリスザルの体温調節行動を変化させる] med./bio.

Microwaves modify thermoregulatory behavior in squirrel monkey.

掲載誌: Bioelectromagnetics 1980; 1 (1): 1-20

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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研究目的(著者による)

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.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 2.45 GHz
Modulation type: CW
ばく露時間: 10 min
ばく露2: 2.45 GHz
Modulation type: CW
ばく露時間: 10 min

ばく露1

主たる特性
周波数 2.45 GHz
特性
  • far field
ばく露時間 10 min
Modulation
Modulation type CW
ばく露装置
ばく露の発生源/構造
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.
パラメータ
測定量 種別 Method Mass 備考
電力密度 10 W/m² minimum 測定値 - 2 mW/cm², 4 mW/cm², 6 mW/cm², 8 mW/cm² and 10 mW/cm²

ばく露2

主たる特性
周波数 2.45 GHz
特性
  • far field
ばく露時間 10 min
Modulation
Modulation type CW
ばく露装置
ばく露の発生源/構造
  • E1と同じ装置
Distance between exposed object and exposure source 1.85 m
パラメータ
測定量 種別 Method Mass 備考
電力密度 80 W/m² minimum 測定値 - 10 mW/cm², 12 mW/cm², 15 mW/cm², 18 mW/cm² and 22 mW/cm²

ばく露を受けた生物:

方法 影響評価項目/測定パラメータ/方法

研究対象とした生物試料:
調査の時期:
  • ばく露中

研究の主なアウトカム(著者による)

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.

研究の種別:

研究助成

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