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HEATING OF HUMAN TISSUES BY SHORT WAVE DIATHERMY

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JOHN S. COULTER, M.D., HOWARD A. CARTER, B.S. in M.E. · 1936

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This 1936 research proved RF electromagnetic fields directly heat human tissues, establishing biological interaction principles still relevant today.

Plain English Summary

Summary written for general audiences

This 1936 study by Coulter examined how short wave diathermy (a medical heating treatment using radio frequency electromagnetic fields) raises temperatures in human tissues. The research explored the biological heating effects of RF energy, documenting how electromagnetic fields can directly warm body tissues through energy absorption.

Why This Matters

This research represents one of the earliest systematic investigations into how RF electromagnetic fields interact with human tissue to produce measurable biological effects. While diathermy was intentionally designed to heat tissue for therapeutic purposes, Coulter's work established fundamental principles about how RF energy transfers into biological systems that remain relevant today. The heating mechanism he documented is the same process that occurs with modern wireless devices, though at much lower intensities. What this means for you is that the biological interaction between RF fields and human tissue has been scientifically recognized for nearly a century. The difference between therapeutic diathermy and everyday EMF exposure isn't the mechanism but the intensity and duration.

Figures from the Original Paper

Diagram extracted from the original research document.

chartPage 2 - AI-described figure: Chart showing the relation between wavelength and temperature with cuff electrode method.
p. 2 of the original PDF

Exposure Information

Specific exposure levels were not quantified in this study. Duration: 20 minutes

Study Details

To determine the heating efficacy of short wave diathermy in living human fat and muscle of the thigh using different wavelengths (6, 12, 18, 24 meters for electric field method and 12, 18, 24 meters for electromagnetic field method).

Six human subjects (medical students) were used. Temperatures were taken using thermocouples inserte...

No significant differences in heating were observed between 6, 12, 18 and 24 meter wavelengths when ...

In the heating of live human muscle and fat, there were no significant differences in the use of 6, 12, 18 and 24 meter wavelengths when using the cuff technic of the electric field method and no significant differences in the use of 12, 18 and 24 meter wavelengths when using the coil technic of the electromagnetic field method.

Cite This Study
JOHN S. COULTER, M.D., HOWARD A. CARTER, B.S. in M.E. (1936). HEATING OF HUMAN TISSUES BY SHORT WAVE DIATHERMY.
Show BibTeX
@article{heating_of_human_tissues_by_short_wave_diathermy_g5879,
  author = {JOHN S. COULTER and M.D. and HOWARD A. CARTER and B.S. in M.E.},
  title = {HEATING OF HUMAN TISSUES BY SHORT WAVE DIATHERMY},
  year = {1936},
  
  
}
No DOI on file for this study.

Quick Questions About This Study

Short wave diathermy is a medical therapy that uses radio frequency electromagnetic fields to deliberately heat deep tissues for pain relief and healing. It operates on the same heating principle as modern microwave ovens but at different frequencies.
RF electromagnetic fields cause water molecules and ions in tissue to vibrate rapidly, generating friction and heat. This process, called dielectric heating, occurs whenever RF energy is absorbed by biological material containing water.
Coulter's work established that human tissues absorb and respond to RF electromagnetic energy through measurable heating. This same absorption mechanism occurs with all RF devices today, including cell phones and WiFi routers.
Yes, all RF devices heat tissue through the same dielectric heating process Coulter documented. Modern devices operate at much lower power levels, but the fundamental physics of energy absorption remains identical.
While this study's specific temperature data isn't available, medical diathermy typically raised tissue temperatures several degrees Celsius for therapeutic effect, demonstrating significant energy absorption and biological response to RF fields.