Study type: Medical/biological study (experimental study)

Microwave and infra-red effects on heart rate, respiration rate and subcutaneous temperature of the rabbit. med./bio.

Published in: J Microw Power 1975; 10 (1): 3-18

Aim of study (acc. to editor)

To study the effects of microwaves (continuous wave and pulsed wave) and infrared exposure on heart rate, respiratory rate and subcutaneous temperature of the rabbit.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 2.45 GHz
Modulation type: CW
Exposure duration: 2 x 60 min
Exposure 2: 2.8 GHz
Modulation type: CW
Exposure duration: 60 min
Exposure 3: 2.8 GHz
Modulation type: pulsed
Exposure duration: 60 min
Exposure 4: 2.4 GHz
Modulation type: CW
Exposure duration: 2 x 60 min

Exposure 1

Main characteristics
Frequency 2.45 GHz
Type
Waveform
Charakteristic
Exposure duration 2 x 60 min
Modulation
Modulation type CW
Exposure setup
Exposure source
Distance between exposed object and exposure source 0.74 m
Chamber microwave anechoic chamber/102 x 102 x 163 cm lined with 61 x 61cm absorber panels
Setup The animals were confined in a wooden squeeze box and restrained by wooden dowels. The squeeze box was placed on a large polystyrene waste tray and positioned within the chamber
Parameters
Measurand Value Type Method Mass Remarks
power density 200 W/m² minimum calculated - 400, 600, 800 W/m²

Exposure 2

Main characteristics
Frequency 2.8 GHz
Type
Waveform
Charakteristic
Exposure duration 60 min
Modulation
Modulation type CW
Exposure setup
Exposure source
Distance between exposed object and exposure source 0.74 m
Additional info shielded absorber panel was not used, hence the entire dorsal surface was irradiated
Parameters
Measurand Value Type Method Mass Remarks
power density 200 W/m² mean calculated - -

Exposure 3

Main characteristics
Frequency 2.8 GHz
Type
Waveform
Charakteristic
Exposure duration 60 min
Modulation
Modulation type pulsed
Pulse width 1.3 µs
Repetition frequency 1,000 Hz
Exposure setup
Exposure source
Distance between exposed object and exposure source 0.74 m
Additional info shielded absorber panel was not used, hence the entire dorsal surface was irradiated
Parameters
Measurand Value Type Method Mass Remarks
power density 200 W/m² mean calculated - -

Exposure 4

Main characteristics
Frequency 2.4 GHz
Type
Waveform
Charakteristic
Exposure duration 2 x 60 min
Modulation
Modulation type CW
Exposure setup
Exposure source
Distance between exposed object and exposure source 0.74 m
Additional info shielded absorber panel was not used, hence the entire dorsal surface was irradiated
Parameters
Measurand Value Type Method Mass Remarks
power density 200 W/m² mean calculated - and 100 W/m²

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Investigated organ system:
Time of investigation:
  • before exposure
  • during exposure

Main outcome of study (acc. to author)

Exposure to 2.4 GHz microwaves, continuous wave (0 to 80 mW/cm²): increases in all three indices measured resulted, with the greatest increases at the highest power levels. Respiratory rate increases of the animals were 20 times greater than those in the heart rate.
Exposure to 2.8 GHz microwaves, continuous wave and pulsed wave (20 mW/cm²): no significant difference in any of the three indices measured between the continuous wave and pulsed wave responses could be revealed.
Exposure to 2.4 GHz microwaves, continuous wave (0, 10, and 20 mW/cm²) and infrared exposure: although respiratory rate and heart rate alterations were substantially the same, subcutaneous temperature increased more rapidly and rose to higher values for the infrared case.

Study character:

Study funded by