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Cardiovascular

Absence of Heart-Rate Effects in Rabbits During Low-Level Microwave Irradiation

No Effects Found

Ira T. Kaplan, William Metlay, Milton M. Zaret, Leo Birenbaum, Saul W. Rosenthal · 1971

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Rabbit hearts showed no response to 2.4 GHz microwaves at moderate power levels, contradicting earlier Soviet research claims.

Plain English Summary

Summary written for general audiences

Researchers exposed rabbits to 2.4 GHz microwave radiation at power levels similar to early wireless devices to test Soviet claims that low-level microwaves affect heart rate. They found no heart rate changes at 10 mW/cm², but did observe effects at much higher power densities (100 mW/cm²). This suggests earlier Soviet findings may have been statistical variations rather than real biological effects.

Cite This Study
Ira T. Kaplan, William Metlay, Milton M. Zaret, Leo Birenbaum, Saul W. Rosenthal (1971). Absence of Heart-Rate Effects in Rabbits During Low-Level Microwave Irradiation.
Show BibTeX
@article{absence_of_heart_rate_effects_in_rabbits_during_low_level_microwave_irradiation_g7059,
  author = {Ira T. Kaplan and William Metlay and Milton M. Zaret and Leo Birenbaum and Saul W. Rosenthal},
  title = {Absence of Heart-Rate Effects in Rabbits During Low-Level Microwave Irradiation},
  year = {1971},
  
  
}

Quick Questions About This Study

No, researchers found no significant heart rate changes in rabbits exposed to 2.4 GHz microwaves at 10 mW/cm² for 20 minutes, contradicting earlier Soviet studies that claimed such effects existed.
Rabbit heart rates only increased when exposed to 2.4 GHz microwaves at 100 mW/cm², which is 10 times higher than the level that supposedly caused effects in Soviet studies.
The 10 mW/cm² level tested in rabbits is approximately 50 times higher than typical cell phone radiation exposure levels, yet produced no measurable cardiovascular effects in this study.
Researchers suggested the heart rate effects reported in original Soviet studies might have been chance statistical variations rather than real biological effects, based on their replication analysis.
Before heart rate increased at 100 mW/cm², rabbits showed increased respiration rate at 40 mW/cm² and rising body temperature at 80 mW/cm², indicating a clear progression of thermal effects.