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Brain & Nervous System

Effects of acute exposure to a 1439 MHz electromagnetic field on the microcirculatory parameters in rat brain.

No Effects Found

Masuda H, Ushiyama A, Hirota S, Wake K, Watanabe S, Yamanaka Y, Taki M, Ohkubo C. · 2007

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Ten-minute exposures to cell phone radiation showed no immediate effects on brain blood circulation in rats, but this doesn't address long-term exposure risks.

Plain English Summary

Summary written for general audiences

Researchers exposed rats to cell phone frequency radiation (1,439 MHz) for 10 minutes at three different power levels to see if it affected blood flow and the blood-brain barrier in their brains. They found no changes in any of the brain circulation measurements, including blood vessel size, blood flow speed, and whether the protective blood-brain barrier became more permeable. This suggests that short-term exposure to this type of radiofrequency radiation did not disrupt normal brain blood circulation.

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: 1,439 MHz Duration: 10 min

Study Details

THE AIM of this study was to determine the potential of radio-frequency electromagnetic fields (RF-EMF) to affect cerebral microcirculation, including blood-brain barrier function, in rat brain.

The head of the rat was exposed for 10 min to 1439 MHz RF-EMF having three intensity doses: 0.6, 2.4...

No extravasation of intravenously injected dyes from pial venules was found at any BASAR level. No s...

These findings suggest that there were no effects on the cerebral microcirculation under the given RF-EMF exposure conditions.

Cite This Study
Masuda H, Ushiyama A, Hirota S, Wake K, Watanabe S, Yamanaka Y, Taki M, Ohkubo C. (2007). Effects of acute exposure to a 1439 MHz electromagnetic field on the microcirculatory parameters in rat brain. In Vivo. 21(4):555-562, 2007.
Show BibTeX
@article{h_2007_effects_of_acute_exposure_3236,
  author = {Masuda H and Ushiyama A and Hirota S and Wake K and Watanabe S and Yamanaka Y and Taki M and Ohkubo C.},
  title = {Effects of acute exposure to a 1439 MHz electromagnetic field on the microcirculatory parameters in rat brain.},
  year = {2007},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/17708346/},
}
PubMed: 17708346

Cited By (22 papers)

Quick Questions About This Study

No, 1439 MHz radiation does not affect brain blood flow. A 2007 study exposed rats to this cell phone frequency for 10 minutes at various power levels and found no changes in blood vessel size, flow speed, or circulation patterns in brain tissue.
No, 10 minutes of 1439 MHz cell phone radiation does not damage the blood-brain barrier. Japanese researchers found no increased permeability or leakage when they tested this specific frequency on rat brains using injected dyes to measure barrier function.
No, short-term 1439 MHz exposure does not cause brain inflammation. The 2007 study found no increase in white blood cells adhering to brain blood vessels, which would indicate an inflammatory response to the radiofrequency radiation.
Brain blood vessels remain completely normal during 1439 MHz EMF exposure. Researchers measured vessel diameter and blood plasma velocity in rat brains and found both parameters stayed within normal physiological ranges throughout the entire 10-minute exposure period.
No, 1439 MHz does not affect brain microcirculation. This specific frequency, commonly used in cell phones, showed no impact on tiny brain blood vessels, blood flow patterns, or the protective blood-brain barrier in controlled laboratory testing.