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A COMPARATIVE STUDY OF SHORT WAVE AND MICROWAVE DIATHERMY ON BLOOD FLOW: The Role of the Somatic and Sympathetic Nerves in the Vascular Response to Deep Tissue Heating

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Lawrence L. Siems, A. J. Kosman, Stafford L. Osborne · 1948

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Microwave frequencies enhanced blood flow while shortwave didn't, proving EMF biological effects vary by frequency beyond heating.

Plain English Summary

Summary written for general audiences

This 1948 study compared how microwave versus shortwave diathermy (medical heating devices) affected blood flow in dog arteries. Researchers found that microwave heating increased blood flow while shortwave heating either had no effect or actually decreased it, challenging the assumption that all forms of heating improve circulation equally.

Why This Matters

This early research revealed something crucial that still applies today: not all electromagnetic frequencies affect our biology the same way, even when they produce similar heating effects. The study demonstrated that microwaves specifically enhanced blood circulation while shortwave frequencies did not, showing that biological responses depend on frequency characteristics beyond just thermal effects. What makes this particularly relevant is that modern microwave ovens, WiFi routers, and cell phones all operate in similar frequency ranges to the microwave diathermy devices that showed enhanced blood flow effects. This suggests our daily EMF exposures may be triggering specific vascular responses that go beyond simple heating. The research challenges the outdated view that EMF effects are purely thermal and highlights why we need frequency-specific safety standards rather than one-size-fits-all approaches.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Lawrence L. Siems, A. J. Kosman, Stafford L. Osborne (1948). A COMPARATIVE STUDY OF SHORT WAVE AND MICROWAVE DIATHERMY ON BLOOD FLOW: The Role of the Somatic and Sympathetic Nerves in the Vascular Response to Deep Tissue Heating.
Show BibTeX
@article{a_comparative_study_of_short_wave_and_microwave_diathermy_on_blood_flow_the_role_g6885,
  author = {Lawrence L. Siems and A. J. Kosman and Stafford L. Osborne},
  title = {A COMPARATIVE STUDY OF SHORT WAVE AND MICROWAVE DIATHERMY ON BLOOD FLOW: The Role of the Somatic and Sympathetic Nerves in the Vascular Response to Deep Tissue Heating},
  year = {1948},
  
  
}

Quick Questions About This Study

The frequency-specific interaction between electromagnetic fields and biological tissue created different vascular responses. Microwave frequencies appeared to trigger enhanced circulation mechanisms beyond simple thermal heating, while shortwave frequencies did not produce the same beneficial blood flow effects.
Modern microwave ovens, WiFi, and cell phones operate in similar frequency ranges to the medical diathermy devices that enhanced blood flow. This suggests our daily EMF exposures may trigger specific vascular responses that current safety standards don't account for.
Yes, the study included both normal dogs and dogs with unilateral denervation (nerve damage) in hind extremities. This design helped researchers understand whether nerve function influenced how different electromagnetic frequencies affected blood circulation in the femoral artery.
The research contradicted the universal belief that all heating methods increase blood flow equally. By showing microwave and shortwave diathermy produced different vascular effects, it forced a revision of physiologic heating concepts in medical practice.
Researchers monitored blood flow changes in the femoral artery of dogs during exposure to both microwave and shortwave diathermy treatments. They compared circulation responses between the two frequency types to identify differences in biological effects.