Study type: Medical/biological study (experimental study)

Interaction of ambient temperature and microwave power density on schedule-controlled behavior in the rat med./bio.

Published in: Radio Sci 1982; 17: 179S-184S

Aim of study (acc. to author)

To quantify the interactive effects of microwave power density and temperature on behavioral changes of rats.

Background/further details

Groups of rats were exposed to 2450 MHz continuous wave (CW) microwaves for 15.5 hours under different combinations of power density and air temperature (0, 8, or 14 mW/cm² at 22°C, 26°C, or 30°C).



Exposure Parameters
Exposure 1: 2.45 GHz
Modulation type: CW
Exposure duration: continuous for 15.5 h

General information

rats were exposed following this three schedules: i) 8 or 14 mW/cm² at 22° C ii) 0, 8 or 14 mW/cm² at 26° C iii) 0, 8 or 14 mW/cm² at 30° C

Exposure 1

Main characteristics
Frequency 2.45 GHz
Exposure duration continuous for 15.5 h
Modulation type CW
Exposure setup
Exposure source
Distance between exposed object and exposure source 2.7 m
Setup Styrofoam chamber containing the cages inside the anechoic chamber
Sham exposure A sham exposure was conducted.
Measurand Value Type Method Mass Remarks
power density 8 mW/cm² - - - -
power density 14 mW/cm² - - - -

Reference articles

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Time of investigation:
  • before exposure
  • after exposure

Main outcome of study (acc. to author)

The data show that intensity of microwave exposure and ambient temperature interact to increase decrements in rates of behavioral responding measured at the termination of exposure. Microwave exposure reduced rates of responding in direct proportion to the power density at each ambient temperature.
After irradiation at 8 mW/cm² response rate were decreased by a mean of 13.8% at 22°C, 27.5% at 26°C, and 77.5% at 30°C. After irradiation at 14 mW/cm², rates were decreased by a mean of 21.1% at 22°C, 43.7% at 26°C, and 80.0% at 30°C.
In the absence of microwaves the higher temperatures caused only slight decreases in response rate.
Increases of body temperature and losses of body mass, although slight and within physiologically normal limits, were revealed along with the behavioral alterations after combined exposure to higher levels of temperature and microwave irradiation.

Study character:

Study funded by

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