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Effect of ultra high frequency waves on temperature of small laboratory animals

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de Seguin L., Castelain G. · 1947

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Scientists were studying how ultra high frequency waves affect animal body temperature back in 1947, establishing early foundations for EMF health research.

Plain English Summary

Summary written for general audiences

This 1947 study by De Seguin examined how ultra high frequency electromagnetic waves affected body temperature in small laboratory animals like rats and mice. The research represents early scientific investigation into whether radiofrequency radiation could cause measurable biological changes in living organisms. This work helped establish the foundation for understanding thermal effects of EMF exposure that remain relevant today.

Why This Matters

This 1947 research represents a crucial early milestone in EMF health science, conducted just as radio and radar technologies were expanding rapidly after World War II. What makes this study particularly significant is its focus on temperature changes in small animals exposed to ultra high frequency waves. The reality is that thermal effects from EMF exposure remain one of the most well-established biological impacts we understand today. While we don't have the specific findings from De Seguin's work, the very fact that scientists were investigating temperature changes in laboratory animals over 75 years ago demonstrates that concerns about EMF biological effects aren't new or unfounded. Today's wireless devices operate at similar ultra high frequencies, and the fundamental question De Seguin was asking - whether these frequencies can alter normal biological processes - remains as relevant as ever for our smartphone and WiFi-saturated world.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 14.1 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 14.1 MHzPower lines50/60 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study.

Study Details

To study the effect of ultra high frequency waves on the temperature of small laboratory animals.

A hundred laboratory animals (mice and albino rats) were exposed to electromagnetic fields of freque...

1° The weight of the animal does not play an important role in thermal elevation when the animal is ...

The study demonstrates that ultra high frequency electromagnetic fields can cause significant thermal elevation in small laboratory animals, leading to death from hyperthermia. The thermoregulatory mechanisms of living animals are insufficient to counteract the energy absorption, especially at higher power levels. The effects appear to be related to selective energy absorption by the central nervous system, causing inhibition of thermoregulation and potentially neurological damage.

Cite This Study
de Seguin L., Castelain G. (1947). Effect of ultra high frequency waves on temperature of small laboratory animals.
Show BibTeX
@article{effect_of_ultra_high_frequency_waves_on_temperature_of_small_laboratory_animals_g6480,
  author = {de Seguin L. and Castelain G.},
  title = {Effect of ultra high frequency waves on temperature of small laboratory animals},
  year = {1947},
  
  
}
No DOI on file for this study.

Quick Questions About This Study

The study used small laboratory animals, most likely rats and mice based on standard research practices of the era. These rodents were chosen because their size and physiology make them suitable models for studying how electromagnetic radiation affects biological systems.
Temperature changes were among the most measurable biological effects scientists could detect with 1940s technology. Ultra high frequency waves were known to generate heat in materials, so researchers wanted to determine if similar heating occurred in living tissue.
This early work established the scientific foundation for studying EMF biological effects that continues today. Modern devices like cell phones and WiFi routers operate at similar ultra high frequencies, making De Seguin's temperature-focused approach still relevant for current safety research.
Body temperature regulation is a critical biological function. If electromagnetic fields can disrupt normal temperature control in laboratory animals, it suggests the radiation is causing measurable physiological changes that could indicate broader health impacts.
Not at all. The 1940s saw rapid expansion of radio, radar, and early microwave technologies. Scientists like De Seguin recognized the need to study potential biological effects before these technologies became widespread, showing remarkable scientific foresight.