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MICROWAVES AFFECT THERMOREGULATORY BEHAVIOR IN RATS

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Rats reduced lever pressing for an infrared heat lamp during 15-minute exposures to 2450 Megahertz microwaves at power densities from 5 to 20 mW/cm², with the reduction proportional to power density, immediate onset, and immediate recovery after exposure.

Plain English Summary

Summary written for general audiences

During each session, alternating 15-minute control and exposure periods presented 2450 MHz continuous wave microwaves at power densities of 5, 10, and 20 mW/cm². The proportion of time the heat lamp stayed on decreased as microwave power density increased, and a linear regression showed an intercept of 0.324, slope of -0.0063 (p<0.001), with power density accounting for 61% of the variation. Randomization tests confirmed significant differences at all power densities versus zero exposure (p<0.003), except at 5 mW/cm² versus all zero exposures (p=0.023) and versus adjacent 10 mW/cm² (p=0.021).

Exposure Details

Power Density
20 mW/cm2
Exposure Duration
15 minutes

Exposure Context

This study used 20 mW/cm2 for radio frequency:

Building Biology guidelines are practitioner-based limits from real-world assessments. BioInitiative Report recommendations are based on peer-reviewed science. Check Your Exposure to compare your own measurements.

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 20 mW/cm2Extreme Concern - 1,000 µW/m²FCC Limit - 10M µW/m²Effects observed in the Extreme Concern range (Building Biology)This level is 20 times the FCC limit
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 2450 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 2450 MHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale
Cite This Study
Stern (n.d.). MICROWAVES AFFECT THERMOREGULATORY BEHAVIOR IN RATS.
Show BibTeX
@article{microwaves_affect_thermoregulatory_behavior_in_rats_g5428,
  author = {Stern},
  title = {MICROWAVES AFFECT THERMOREGULATORY BEHAVIOR IN RATS},
  year = {n.d.},
  
  
}
No DOI on file for this study.

Quick Questions About This Study

The study used 2450 MHz continuous wave microwaves in alternating 15-minute exposure periods.
The proportion of time the heat lamp was kept on decreased as microwave power density increased, with power density accounting for 61% of the variation in a linear regression.
The effect occurred at 5 mW/cm², with randomization tests showing p=0.023 compared to all zero exposures and p=0.021 compared to adjacent 10 mW/cm² exposure.
The authors noted that even if colonic temperature changes sometimes occur at 5 mW/cm², the time course of the behavior change does not parallel it, and the behavioral changes were immediately related to thermal input.