THE RELATION OF FREQUENCY TO THE PHYSIOLOGICAL EFFECTS OF ULTRA-HIGH FREQUENCY CURRENTS
RONALD V. CHRISTIE, ALFRED L. LOOMIS · 1928
This 1929 study established that electromagnetic frequency determines physiological effects, laying groundwork for modern EMF health research.
Plain English Summary
This 1929 research by Christie examined how different frequencies of ultra-high frequency electromagnetic currents affected human physiology. The study investigated the relationship between frequency and biological effects, contributing early scientific evidence about how electromagnetic fields interact with the human body. This work helped establish the foundation for understanding frequency-dependent effects in what would later become diathermy treatments.
Why This Matters
This research represents one of the earliest systematic investigations into how electromagnetic frequency affects human biology. Published in 1929, Christie's work came at a time when scientists were just beginning to understand that different frequencies could produce different physiological responses. The science demonstrates that even nearly a century ago, researchers recognized the importance of frequency in determining biological effects. What this means for you is that frequency matters tremendously when evaluating EMF exposure. The reality is that our modern world exposes us to a vast spectrum of frequencies that didn't exist in Christie's time. While his research focused on ultra-high frequencies used in early medical applications, today we're surrounded by everything from 60 Hz power line frequencies to gigahertz frequencies from WiFi and cell phones. This foundational work reminds us that frequency-specific effects have been scientifically recognized for generations.
Figures from the Original Paper
Diagrams extracted from the original research document.
Exposure Information
Specific exposure levels were not quantified in this study. Duration: 3-5 minutes at 6.0-36.1 meters, 6-12 minutes at 3.2 meters, 8-13 minutes at 1.9 meters
Study Details
To investigate the relationship between frequency and physiological effects of ultra-high frequency currents, specifically examining lethal effects and heat production in mice at various frequencies.
Mice were exposed to ultra-high frequency radiations from a vacuum tube oscillator operating at freq...
The lethal effect of the radiations was found to be proportionate to the intensity of the electromag...
The lethal effect of ultra-high frequency currents can be fully accounted for on the basis of heat production. The production of heat is strictly analogous to that observed in diathermy, being generated by the resistance and dielectric loss in tissues. The results do not suggest any specificity exists with regard to the action of particular wave-lengths on living cells. The apparent lethality of the radiation decreases at very low wave-lengths due to less current being induced in the mouse, which can be explained by changes occurring in the dielectric properties of tissues at low wavelengths.
Show BibTeX
@article{the_relation_of_frequency_to_the_physiological_effects_of_ultra_high_frequency_c_g5533,
author = {RONALD V. CHRISTIE and ALFRED L. LOOMIS},
title = {THE RELATION OF FREQUENCY TO THE PHYSIOLOGICAL EFFECTS OF ULTRA-HIGH FREQUENCY CURRENTS},
year = {1928},
}