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Cardiovascular

LOW-LEVEL MICROWAVE INTERACTION WITH ISOLATED MAMMALIAN HEARTS

Bioeffects Seen

R.G. Olson, C.H. Durney, J.L. Lords, C.C. Johnson · 1973

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Microwave radiation at 960 MHz caused rapid heart rate slowdown in isolated rat hearts within two minutes.

Plain English Summary

Summary written for general audiences

Researchers exposed isolated rat hearts to 960 MHz microwave radiation at power levels of 1.5 to 2.5 mW/cm³. Within two minutes, the hearts developed pronounced bradycardia (slowed heart rate) with both regular decreases and temporary cessations. This built on previous turtle heart studies showing similar cardiac effects from microwave exposure.

Why This Matters

This 1973 study provides early evidence that microwave radiation can directly affect cardiac function in mammalian tissue. The power levels used (1.5-2.5 mW/cm³) are actually lower than what your body absorbs during typical cell phone use, which ranges from 0.5-2.0 watts per kilogram. What makes this particularly significant is the rapid onset - cardiac changes occurred within just two minutes of exposure. The science demonstrates that electromagnetic fields can influence the heart's electrical system even at relatively low power levels. While this was an isolated heart preparation rather than a living animal, it shows direct biological effects on cardiac tissue that extend beyond the thermal heating that regulators focus on.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
R.G. Olson, C.H. Durney, J.L. Lords, C.C. Johnson (1973). LOW-LEVEL MICROWAVE INTERACTION WITH ISOLATED MAMMALIAN HEARTS.
Show BibTeX
@article{low_level_microwave_interaction_with_isolated_mammalian_hearts_g6512,
  author = {R.G. Olson and C.H. Durney and J.L. Lords and C.C. Johnson},
  title = {LOW-LEVEL MICROWAVE INTERACTION WITH ISOLATED MAMMALIAN HEARTS},
  year = {1973},
  
  
}

Quick Questions About This Study

Yes, this study found that 960 MHz microwave radiation at 1.5-2.5 mW/cm³ caused pronounced bradycardia (slowed heart rate) in isolated rat hearts within two minutes of exposure, including both regular decreases and temporary cessations.
The cardiac effects occurred within two minutes of microwave exposure. This rapid onset suggests that electromagnetic fields can influence heart tissue almost immediately, not requiring long-term exposure to produce measurable biological changes.
The study used absorbed power levels of 1.5 to 2.5 mW/cm³ to produce cardiac effects. These levels are actually lower than typical cell phone radiation exposure, which can reach 0.5-2.0 watts per kilogram in human tissue.
The researchers used isolated rat hearts that were artificially perfused with oxygenated solution, not living animals. This allowed them to study direct effects on cardiac tissue without other body systems interfering with the results.
The hearts developed bradycardia, which means abnormally slow heart rate. The researchers observed both regular decreases in heart rate and temporary cessations where the heart briefly stopped beating during microwave exposure.