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Brain & Nervous System

Non-thermal microwave effect on nerve fiber function

Bioeffects Seen

Pakhomov AG · 1993

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Microwave irradiation during stimulation significantly decreased action potential amplitude and peak latency in isolated frog nerve cords, and the authors argue this indicates a non-thermal mechanism.

Plain English Summary

Summary written for general audiences

Researchers investigated effects of 915 MHz pulsed microwave radiation with peak SAR 20-30 W/g on isolated frog nerve cords. Nerve heating did not exceed 2.2°C due to intense Ringer's solution perfusion. Irradiation during stimulation significantly decreased action potential amplitude and peak latency, while conventional heating increased amplitude, supporting a non-thermal mechanism.

Exposure Details

SAR
20000 -30000 W/kg
Source/Device
915 MHz

Exposure Context

This study used 20000 -30000 W/kg for SAR (device absorption):

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: 20000 -30000 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern range (Building Biology)This level is 12,500 times the FCC limit
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 915 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 915 MHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

Effects of microwave radiation (915 MHz, PW, peak SAR 20-30 W/g, pulse duration 1 mcs, 50.000 and 25.000 p.p.s.) were investigated in isolated frog nerve cord preparation.

Nerve VHF heating didn't exceed 2.2 degrees C due to intense Ringer's solution perfusion. It was es...

Cite This Study
Pakhomov AG (1993). Non-thermal microwave effect on nerve fiber function Biofizika 38(2):367-371, 1993.
Show BibTeX
@article{ag_1993_nonthermal_microwave_effect_on_1245,
  author = {Pakhomov AG},
  title = {Non-thermal microwave effect on nerve fiber function},
  year = {1993},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/8485199/},
}
PubMed: 8485199

Cited By (3 papers)

Quick Questions About This Study

The study used 915 MHz pulsed microwave radiation with peak SAR 20-30 W/g, pulse duration 1 mcs, and 50.000 and 25.000 p.p.s.
The study used an isolated frog nerve cord preparation.
Nerve VHF heating did not exceed 2.2°C due to intense Ringer's solution perfusion.
Microwave irradiation during stimulation significantly decreased action potential amplitude and peak latency.
The authors concluded that the results argue for a non-thermal mechanism because conventional heating caused opposite changes.