Study type: Medical/biological study (experimental study)

Heart rate changes due to 5.6-GHz radiofrequency radiation: relation to average power density. med./bio.

Published in: Proc Soc Exp Biol Med 1984; 177 (3): 383-387

Aim of study (acc. to author)

To study the effects of 5.6 GHz radiofrequency irradiation on heart rate, blood pressure, and respiratory rate in anesthetized rats during intermittent exposures which resulted in 1°C colonic temperature changes.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 5.6 GHz
Modulation type: CW
Exposure duration: intermittent*
Exposure 2: 5.6 GHz
Modulation type: pulsed
Exposure duration: intermittent*

General information

*The exposure was preformed until the colonic temperature of 39.5°C was reached, then stoped until it is 38.5°C and iniated again until it reached 39.5°C. This procedure was repeated for eight cycles

Exposure 1

Main characteristics
Frequency 5.6 GHz
Type
Waveform
Charakteristic
Exposure duration intermittent*
Modulation
Modulation type CW
Exposure setup
Exposure source
Chamber RF-exposure chamber
Setup animal positioned in a plexiglass holder with the long axis parallel to H-field
Parameters
Measurand Value Type Method Mass Remarks
power density 600 W/m² mean measured - 12 W/kg corresponding SAR value; exposure duration of 6.3 ± 0.3 min
power density 300 W/m² mean measured - 6 W/kg corresponding SAR value; exposure duration of 14.9 ± 1.2 min

Exposure 2

Main characteristics
Frequency 5.6 GHz
Type
Waveform
Charakteristic
Exposure duration intermittent*
Modulation
Modulation type pulsed
Additional info

pulse duration 1 or 2 µs; repetition rates 250 or 500 pps

Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
power density 300 W/m² mean measured - 6 W/kg corresponding SAR value; exposure duration of 14.9 ± 1.2 min
power density 600 W/m² mean measured - 12 W/kg corresponding SAR value; exposure duration of 6.3 ± 0.3 min

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

There was no differences between results of continuous wave and pulsed wave exposure. During irradiation to 60 mW/cm² which resulted in a 1°C change in colonic temperature, heart rate increased; the values returned to control levels after irradiation was discontinued. No changes in mean arterial blood pressure or in respiratory rate were revealed. Exposure to 30 mW/cm² produced no significant changes in heart rate, blood pressure, or respiratory rate.
The results indicate that heart rate changes during exposure to 5.6-GHz radiofrequency irradiation are related to the average power density applied, and thus to the rate of change in temperature.

Study character:

Study funded by