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Brain & Nervous System

Effects of subchronic 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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Four weeks of cell phone-level RF exposure showed no effects on brain blood vessels in rats.

Plain English Summary

Summary written for general audiences

Researchers exposed rats' heads to cell phone-level radiation (1439 MHz) for one hour daily over four weeks to study effects on brain blood vessels. They found no changes in blood-brain barrier function, immune cell behavior, or blood flow in the brain. This suggests that this level of radiofrequency exposure may not disrupt the brain's delicate blood vessel system.

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 Duration: 60 min/day, 5 days/week, for 4 weeks

Study Details

The aim of this study was to investigate whether repeated exposure to radio frequency electromagnetic field (RF-EMF) of 1439 MHz affects the cerebral microcirculation, including blood-brain barrier function, in a rat brain.

The head of the rat was exposed for four weeks (60 min/day, 5 days/week) to RF-EMF at 2.4 W/kg of br...

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 subchronic exposure to a 1439 MHz electromagnetic field on the microcirculatory parameters in rat brain. In Vivo. 21(4):563-570, 2007.
Show BibTeX
@article{h_2007_effects_of_subchronic_exposure_3235,
  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 subchronic exposure to a 1439 MHz electromagnetic field on the microcirculatory parameters in rat brain.},
  year = {2007},
  
  url = {https://iv.iiarjournals.org/content/21/4/563.short},
}

Quick Questions About This Study

A 2007 study found no damage to brain blood vessels from cell phone-level radiation. Researchers exposed rats to 1439 MHz signals for four weeks and detected no changes in blood-brain barrier function or blood flow patterns.
Research shows cell phone radiation at 1439 MHz does not affect brain blood flow. A four-week study found plasma velocity in brain blood vessels remained normal throughout exposure to cell phone-level electromagnetic fields.
Studies indicate 1439 MHz radiation does not harm brain circulation. Researchers found no effects on cerebral blood vessels, blood-brain barrier function, or immune cell behavior after daily one-hour exposures for four weeks.
Current research suggests RF radiation at cell phone frequencies may not cause brain blood vessel problems. A 2007 study found no disruption to the brain's delicate blood vessel system from 1439 MHz exposure.
Studies show cell phone EMF at 1439 MHz does not affect the blood-brain barrier. Researchers found no leakage of injected dyes from brain blood vessels after four weeks of daily electromagnetic field exposure.