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Rate Effects in Isolated Hearts Induced by Microwave Irradiation

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James L. Lords, Carl H. Durney, Alan M. Borg, Charles K. Finney · 1973

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960 MHz microwave radiation slowed isolated hearts at specific power levels, suggesting non-thermal biological effects in the cell phone frequency range.

Plain English Summary

Summary written for general audiences

Researchers exposed isolated hearts from cold-blooded animals to 960 MHz microwave radiation and found it caused the hearts to beat slower (bradycardia), which is the opposite of what normally happens when hearts are heated. This unexpected effect only occurred at very specific power levels around 3 milliwatts absorbed by the heart tissue.

Why This Matters

This 1973 study reveals something remarkable: microwave radiation can affect heart function through mechanisms that have nothing to do with heating. The fact that 960 MHz radiation caused hearts to slow down rather than speed up suggests direct interaction with the nervous system components in heart tissue. What makes this particularly relevant today is that 960 MHz sits right in the range of modern cell phone frequencies, which typically operate between 800-2100 MHz. The precision required for this effect (only occurring around 3 milliwatts of absorbed power) demonstrates how sensitive biological systems can be to very specific EMF exposures. This challenges the industry assumption that only thermal effects from EMF matter for human health.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
James L. Lords, Carl H. Durney, Alan M. Borg, Charles K. Finney (1973). Rate Effects in Isolated Hearts Induced by Microwave Irradiation.
Show BibTeX
@article{rate_effects_in_isolated_hearts_induced_by_microwave_irradiation_g3778,
  author = {James L. Lords and Carl H. Durney and Alan M. Borg and Charles K. Finney},
  title = {Rate Effects in Isolated Hearts Induced by Microwave Irradiation},
  year = {1973},
  
  
}

Quick Questions About This Study

The study used 960 MHz microwave radiation, which is very close to modern cell phone frequencies that typically range from 800-2100 MHz. This frequency caused isolated hearts to slow down rather than speed up.
The heart-slowing effect only occurred at approximately 3 milliwatts of power absorbed by the heart tissue. This demonstrates that biological effects can happen at very specific, low power levels.
Researchers hypothesized that the 960 MHz radiation stimulated nerve remnants in the heart tissue, causing bradycardia (slow heart rate) rather than the tachycardia (fast heart rate) typically caused by heating.
The researchers used isolated hearts from poikilothermic animals (cold-blooded creatures like fish or amphibians) that were kept alive in Ringer's solution during the microwave exposure experiments.
Yes, the study strongly suggests non-thermal effects since the hearts slowed down instead of speeding up like they would from heating. The effect occurred only at specific power levels, indicating direct biological interaction.