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A clinical study of artificial hyperthermia induced by high frequency currents

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Bishop FW, Horton CB, Warren SL · 1932

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1932 clinical research proved radiofrequency energy creates measurable biological effects in humans through deliberate tissue heating.

Plain English Summary

Summary written for general audiences

This 1932 clinical study examined using high-frequency electromagnetic currents to artificially induce hyperthermia (elevated body temperature) in human patients. The research investigated radiofrequency energy as a medical treatment method, exploring how electromagnetic fields could generate therapeutic heat within the body. This represents some of the earliest documented clinical use of RF energy for deliberate biological effects in humans.

Why This Matters

This 1932 research marks a pivotal moment in our understanding of how radiofrequency energy interacts with human biology. While conducted for therapeutic purposes, this study demonstrates that RF fields can produce measurable biological effects - specifically generating heat deep within body tissues. The science shows that electromagnetic energy doesn't just pass harmlessly through us; it deposits energy and creates physiological changes.

What makes this historically significant is the timing. In 1932, researchers already recognized that RF energy could deliberately alter human physiology. Today, we carry devices that emit similar frequencies constantly, yet we're told these exposures are too weak to matter. The reality is that any energy capable of therapeutic heating at higher intensities can potentially cause subtler effects at the lower levels we encounter daily from wireless devices.

Figures from the Original Paper

Diagrams extracted from the original research document.

diagramPage 3 - AI-described figure: Fig. 1 and Fig. 2 show the general arrangement and interior details of a cellotex chamber used for treating patients with high fever, including the placement of electrodes and surgical tools.
chartPage 4 - This chart illustrates the fluctuations in mouth (dots) and rectal (circles) temperatures during the development of fever.
chartPage 5 - AI-described figure: Fig. 4 illustrates a patient's temperature, pulse, and respiration changes during treatment with high frequency currents.
chartPage 6 - Temperature, pulse and respiration curves in a 50-year-old patient with chronic arthritis. The lower curve illustrates the second reading one month later and shows the effect of a cooling enema as compared to the upper curve where none was given.
chartPage 7 - AI-described figure: Four typical curves showing variations in blood pressure during a treatment session.
graphPage 8 - AI-described figure: A graph showing temperature changes over time for a patient during and after treatment.
diagramPage 10 - AI-described figure: Figures showing hand positions before and after treatment for a patient with advanced arthritis.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 300 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 300 MHzPower lines50/60 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study. Duration: 5 hours

Study Details

To investigate the use of artificial hyperthermia induced by high frequency currents as a therapeutic method for various medical conditions, particularly focusing on safety and clinical effectiveness.

High frequency currents were passed through the body using large block-tin electrodes (28 by 46 to 6...

One hundred treatments were given to 57 patients from February 1930 to August 1931. The artificial h...

Artificial hyperthermia can be carefully and accurately controlled by a standardized procedure well within the scope of the average hospital. The whole body temperature is elevated by the passage of high frequency currents through the trunk by means of large block-tin electrodes. The temperature is maintained at any desired level below 42°C for 5 hours without danger to a patient in ordinary physical condition. The method is effective for treating various conditions including paresis, arthritis, and gonorrheal infections.

Cite This Study
Bishop FW, Horton CB, Warren SL (1932). A clinical study of artificial hyperthermia induced by high frequency currents.
Show BibTeX
@article{a_clinical_study_of_artificial_hyperthermia_induced_by_high_frequency_currents_g6583,
  author = {Bishop FW and Horton CB and Warren SL},
  title = {A clinical study of artificial hyperthermia induced by high frequency currents},
  year = {1932},
  
  
}
No DOI on file for this study.

Quick Questions About This Study

Artificial hyperthermia was a medical technique using high-frequency electromagnetic currents to deliberately raise patients' body temperatures. Doctors applied RF energy to generate therapeutic heat within body tissues, representing early clinical use of electromagnetic fields for biological effects.
Physicians applied high-frequency electromagnetic currents directly to patients to create controlled heating effects in body tissues. This radiofrequency energy was used therapeutically to induce fever-like conditions, demonstrating early medical applications of electromagnetic field exposure in clinical settings.
This study proves electromagnetic fields can create measurable biological effects in humans, contradicting claims that RF energy passes harmlessly through the body. It establishes historical precedent that radiofrequency exposure produces physiological changes, relevant to evaluating modern wireless device safety.
The treatment worked by depositing electromagnetic energy into body tissues, converting RF radiation into heat through dielectric heating mechanisms. This process demonstrates how radiofrequency fields interact with human biology at the cellular level to produce measurable physiological responses.
While 1932 treatments used higher intensities for therapeutic heating, the same fundamental physics applies to modern wireless exposures. Both involve radiofrequency energy interacting with human tissues, though today's chronic low-level exposures may produce different biological effects than acute heating.