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Brain & Nervous System

Effect of chronic intermittent exposure to AM radiofrequency field on responses to various types of noxious stimuli in growing rats.

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Mathur R. · 2008

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Chronic RF exposure altered pain processing in developing rats at levels below current safety limits, suggesting neurological vulnerability during growth.

Plain English Summary

Summary written for general audiences

Researchers exposed growing rats to amplitude-modulated radiofrequency radiation (similar to AM radio signals) for 2 hours daily over 45 days and tested their pain responses. The exposed rats showed altered pain processing - they became more emotionally reactive to sharp pain while experiencing less sensitivity to prolonged pain. This suggests that RF radiation can disrupt the nervous system's normal pain processing mechanisms during critical developmental periods.

Why This Matters

This study reveals something particularly concerning about RF radiation exposure during development. The researchers found that chronic exposure to amplitude-modulated RF fields at relatively low power levels (SAR of 0.4 W/kg, which is below current safety limits) fundamentally altered how the developing nervous system processes pain signals. What makes this especially relevant is that the exposure parameters closely mirror real-world AM radio transmissions that many people encounter daily. The fact that pain processing was disrupted suggests broader neurological effects that could extend beyond pain sensation itself. The science demonstrates that the developing nervous system appears particularly vulnerable to RF radiation, with effects persisting even after exposure ends. This adds to the growing body of evidence showing that current safety standards may not adequately protect developing organisms from neurological impacts of chronic RF exposure.

Exposure Details

SAR
0.4 W/kg
Power Density
1.33 µW/m²
Source/Device
73.5 MHz amplitude modulated
Exposure Duration
45 d (2 h/d)

Exposure Context

This study used 1.33 µW/m² 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: 1.33 µW/m²Extreme Concern - 1,000 uW/m2FCC Limit - 10M uW/m2Effects observed in the Slight Concern rangeFCC limit is 7,518,797x higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 73.5 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 73.5 MHzPower lines50/60 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Study Details

To study the effect of Chronic Intermittent Exposure to AM Radiofrequency Field on Responses to Various Types of Noxious Stimuli in Growing Rats

We studied the pattern of nociceptive responses to various noxious stimuli in growing rats exposed t...

The TFL was not affected, HPL was decreased (p < 0.01), and the thresholds of TF and VD were not aff...

The data suggest that amplitude modulated RF field differentially affects the mechanisms involved in the processing of various noxious stimuli.

Cite This Study
Mathur R. (2008). Effect of chronic intermittent exposure to AM radiofrequency field on responses to various types of noxious stimuli in growing rats. Electromagn Biol Med. 27(3):266-276, 2008.
Show BibTeX
@article{r._2008_effect_of_chronic_intermittent_142,
  author = {Mathur R.},
  title = {Effect of chronic intermittent exposure to AM radiofrequency field on responses to various types of noxious stimuli in growing rats.},
  year = {2008},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/18821202/},
}
PubMed: 18821202

Cited By (13 papers)

View all 13 citing papers on Semantic Scholar

Quick Questions About This Study

Research shows AM radio frequency exposure can alter pain processing in developing brains. A 2008 study found rats exposed to AM radio waves for 45 days experienced changes in how they processed different types of pain, becoming more emotionally reactive to sharp pain while showing reduced sensitivity to chronic pain.
Studies suggest radiofrequency radiation can affect developing nervous systems. Research on growing rats exposed to AM radio frequencies showed altered pain processing mechanisms, indicating that RF exposure during critical developmental periods may disrupt normal brain function and emotional responses to stimuli.
Research indicates AM radio frequencies may affect developing nervous systems differently than adult brains. A study found chronic exposure altered pain processing in growing rats, suggesting children's developing brains could be more vulnerable to radiofrequency radiation effects than previously understood.
RF exposure can disrupt normal pain processing mechanisms in the nervous system. Research shows amplitude-modulated radiofrequency radiation increases emotional responses to sharp pain while reducing sensitivity to prolonged pain, indicating RF fields differentially affect how the brain processes various types of painful stimuli.
Radio wave exposure may alter nervous system function, particularly during development. Studies show chronic AM radio frequency exposure can change pain processing, emotional responses, and potentially other neurological functions, though more research is needed to understand full implications for human health.