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Brain & Nervous System

Biological and morphological effects on the brain after exposure of rats to a 1439 MHz TDMA field.

No Effects Found

Tsurita G, Nagawa H, Ueno S, Watanabe S, Taki M, · 2000

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This study found no brain damage from cell phone-like radiation in rats, but examined only short-term exposure using limited detection methods.

Plain English Summary

Summary written for general audiences

Japanese researchers exposed rats to 1439 MHz radiofrequency radiation (similar to cell phone signals) for one hour daily over 2-4 weeks to test whether it damaged the blood-brain barrier or caused brain tissue changes. They found no effects on blood-brain barrier permeability, no structural damage to brain cells, and no changes in body weight at exposure levels up to 2 W/kg in the brain. This suggests that short-term exposure to cell phone-type radiation at these levels may not cause detectable brain damage in rats.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 1.44 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 1.44 GHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

The study examined exposure from: 1439 MHz

Study Details

We investigated the effects of exposure to a 1439 MHz TDMA (Time Division Multiple Access) field, as used in cellular phones, on the permeability of the blood-brain barrier (BBB), on the morphological changes of the brain, and on body-mass fluctuations.

Male Sprague-Dawley (SD) rats were divided into three groups of eight rats each. The rats in the EM(...

HF-EMWs had no effect on the permeability of BBB. The morphological changes in the cerebellum were i...

In conclusion, a 1439 MHz TDMA field did not induce observable changes in the permeability of the BBB, morphological changes in the cerebellums, or body mass changes in rats, as evaluated by the conventional methods.

Cite This Study
Tsurita G, Nagawa H, Ueno S, Watanabe S, Taki M, (2000). Biological and morphological effects on the brain after exposure of rats to a 1439 MHz TDMA field. Bioelectromagnetics 21(5):364-371, 2000.
Show BibTeX
@article{g_2000_biological_and_morphological_effects_3450,
  author = {Tsurita G and Nagawa H and Ueno S and Watanabe S and Taki M and},
  title = {Biological and morphological effects on the brain after exposure of rats to a 1439 MHz TDMA field.},
  year = {2000},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/10899772/},
}
PubMed: 10899772

Cited By (91 papers)

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Quick Questions About This Study

No, a 2000 Japanese study found that 1439 MHz TDMA radiation did not affect blood-brain barrier permeability in rats. Researchers exposed rats for one hour daily over 2-4 weeks at levels up to 2 W/kg and detected no changes in barrier function using conventional testing methods.
Research shows 1439 MHz radiation does not cause Purkinje cell degeneration in the cerebellum. Japanese scientists exposed rats to this frequency for 2-4 weeks and found no morphological changes in these critical brain cells that control motor coordination and balance.
A 2000 study found no harmful effects from 1439 MHz radiation at 2 W/kg brain SAR levels. Rats showed no blood-brain barrier changes, brain cell damage, or body weight effects after daily one-hour exposures over several weeks at this absorption rate.
No significant changes occurred in brain granular layer cell concentration after 1439 MHz exposure. Japanese researchers found that 2-4 weeks of daily one-hour exposures to this TDMA frequency did not alter cell density in the cerebellum's granular layer of exposed rats.
Daily 1439 MHz TDMA exposure caused no observable brain effects in a 2000 rat study. Researchers found no blood-brain barrier permeability changes, no cerebellum morphological changes, and no body mass effects after 2-4 weeks of one-hour daily exposures.