Study type: Medical/biological study (experimental study)

Physiological and behavioral effects of prolonged exposure to 915 MHz microwaves med./bio.

Published in: J Microw Power 1980; 15 (2): 123-135

Aim of study (acc. to author)

To study physiological and behavioral effects of chronic exposure to 915 MHz microwaves on rats.



Exposure Parameters
Exposure 1: 915 MHz
Modulation type: CW
Exposure duration: 640 h total (8 hr/day, 5 days/week, 16 weeks)
  • power density: 50 W/m² average over time
  • SAR: 2.46 mW/g average over mass (whole body)

Exposure 1

Main characteristics
Frequency 915 MHz
Exposure duration 640 h total (8 hr/day, 5 days/week, 16 weeks)
Modulation type CW
Exposure setup
Exposure source
Chamber anechoic chamber 3.5 m x 3.5 m x 2.75 m (outside), plexiglas holding cages 20cm x 12 cm x 11 cm
Additional info electric field parallel to the long axis of the holding cage and the animal for max. absorption of MW energy
Measurand Value Type Method Mass Remarks
power density 50 W/m² average over time measured - -
SAR 2.46 mW/g average over mass - whole body -

Reference articles

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

Daily measures of body mass and of food and water intake indicated no statistically significant effects of microwave exposure. Measures by activity wheels and stabilimetric platforms of spontaneous locomotion indicate that mean activity levels increased about 25% after microwave irradiation, but the statistical significance of the findings are doubtful. Studies of blood sampled after 2, 6, 10, and 14 weeks of irradiation showed alterations of free sulfhydryls. Measures of levels of urinary 17-ketosteroids at weeks 1, 5, 9, and 12 of irradiation, and measures of brain hypothalamic tissue, and of mass of adrenals, heart, and liver at the end of the 16-week period, revealed no significant differences between exposed and control rats. Cortical EEGs sampled after conclusion of microwave exposures also showed no significant differences.

Study character:

Study funded by

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