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The effect of microwave diathermy on the peripheral circulation and on tissue temperature in man

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Gersten JW, Wakim KG, Herrick JF, Krusen FH · 1949

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1949 research first documented human exposure to microwave frequencies now used in modern wireless devices.

Plain English Summary

Summary written for general audiences

This 1949 study examined how microwave radiation affects blood circulation and tissue temperature in humans, marking early research into microwave therapeutic applications. The researchers explored microwaves in the 300 to 300,000 megacycle frequency range using newly developed magnetron technology originally created for military radar systems. This represents some of the first documented human exposure to controlled microwave radiation for medical purposes.

Why This Matters

This study holds remarkable historical significance as one of the earliest documented investigations into human microwave exposure. What makes this particularly relevant today is that the frequency range studied (300 to 300,000 megacycles, or 300 MHz to 300 GHz) encompasses virtually all modern wireless technologies, from cell phones to WiFi to 5G networks. The researchers were exploring therapeutic heating effects, but they were essentially conducting the first systematic human exposure experiments to the same electromagnetic frequencies now ubiquitous in our environment.

The irony is striking: in 1949, researchers needed specialized military-grade magnetron equipment to generate these frequencies at sufficient power levels for human studies. Today, we carry devices emitting similar frequencies in our pockets and live surrounded by these same electromagnetic fields 24/7. This early work on deliberate therapeutic exposure provides a historical baseline for understanding how these frequencies interact with human physiology, particularly blood circulation and tissue heating, effects that remain relevant as we evaluate the biological impacts of our wireless world.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Gersten JW, Wakim KG, Herrick JF, Krusen FH (1949). The effect of microwave diathermy on the peripheral circulation and on tissue temperature in man.
Show BibTeX
@article{the_effect_of_microwave_diathermy_on_the_peripheral_circulation_and_on_tissue_te_g6569,
  author = {Gersten JW and Wakim KG and Herrick JF and Krusen FH},
  title = {The effect of microwave diathermy on the peripheral circulation and on tissue temperature in man},
  year = {1949},
  
  
}

Quick Questions About This Study

Researchers tested the full microwave spectrum from 300 to 300,000 megacycles per second (300 MHz to 300 GHz). This range encompasses virtually all modern wireless communication frequencies including cell phones, WiFi, and 5G networks.
The magnetron oscillator was the only device capable of generating sufficient microwave power for human therapeutic studies. Developed for military radar during WWII, it provided the high power output needed to produce measurable biological effects in human tissue.
The study examined changes in peripheral circulation when humans were exposed to focused microwave radiation. Researchers were investigating whether microwaves could therapeutically improve blood flow through targeted heating of tissues and blood vessels.
Researchers measured temperature changes in human tissues exposed to controlled microwave radiation. The goal was to determine optimal heating patterns for therapeutic applications, establishing early data on how microwaves transfer energy into biological tissues.
Yes, the 300 MHz to 300 GHz range tested in 1949 directly overlaps with today's wireless technologies. Cell phones operate around 800-2100 MHz, WiFi uses 2.4-5 GHz, and 5G spans up to 95 GHz within this original research spectrum.