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Note: This study found no significant biological effects under its experimental conditions. We include all studies for scientific completeness.

Brain & Nervous System

Histopathological examinations of rat brains after long-term exposure to GSM-900 mobile phone radiation.

No Effects Found

Grafström G, Nittby H, Brun A, Malmgren L, Persson BR, Salford LG, Eberhardt J. · 2008

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Long-term mobile phone radiation exposure showed no brain damage in rats at levels below typical phone use.

Plain English Summary

Summary written for general audiences

Swedish researchers exposed rats to GSM-900 mobile phone radiation for 2 hours weekly over 55 weeks at very low power levels (0.6 and 60 milliwatts per kilogram). When they examined the rats' brains afterward, they found no signs of damage including blood-brain barrier leakage, cell death, or aging-related changes. This contradicts some earlier studies from the same research group that found brain effects at similar exposure levels.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 900 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 900 MHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

The study examined exposure from: GSM-900 mobile phone Duration: 2-h/weekly for totally 55 weeks

Study Details

We have investigated histopathological examinations of rat brains after long-term exposure to GSM-900 mobile phone radiation.

Out of a total of 56 rats, 32 were exposed once weekly in a 2-h period, for totally 55 weeks, at dif...

In this study, no significant alteration of any these histopathological parameters was found, when c...

Cite This Study
Grafström G, Nittby H, Brun A, Malmgren L, Persson BR, Salford LG, Eberhardt J. (2008). Histopathological examinations of rat brains after long-term exposure to GSM-900 mobile phone radiation. Brain Res Bull. 77(5):257-263, 2008.
Show BibTeX
@article{g_2008_histopathological_examinations_of_rat_2756,
  author = {Grafström G and Nittby H and Brun A and Malmgren L and Persson BR and Salford LG and Eberhardt J. },
  title = {Histopathological examinations of rat brains after long-term exposure to GSM-900 mobile phone radiation.},
  year = {2008},
  
  url = {https://www.sciencedirect.com/science/article/abs/pii/S0361923008002748},
}

Quick Questions About This Study

No, Swedish researchers found no brain damage in rats exposed to GSM-900 radiation for 2 hours weekly over 55 weeks. The study examined brain tissue for blood-brain barrier leakage, cell death, and aging changes but found no significant differences compared to unexposed control rats.
No, exposure to GSM-900 radiation at 0.6 milliwatts per kilogram showed no blood-brain barrier leakage in this 2008 Swedish study. Researchers examined rat brains after 55 weeks of weekly 2-hour exposures and found no histopathological changes compared to control animals.
This 2008 Swedish study found no brain effects from GSM-900 exposure, contradicting earlier research from the same team that reported brain damage at similar power levels. The researchers used identical exposure protocols but detected no cell death, barrier leakage, or tissue changes this time.
No brain changes occurred after 55 weeks of weekly GSM-900 exposure in this Swedish rat study. Researchers examined brain tissue for multiple types of damage including cell death, blood-brain barrier problems, and aging-related changes but found no significant alterations compared to unexposed rats.
This Swedish study suggests 60 milliwatts per kilogram GSM-900 exposure may be safe for brain tissue. Rats exposed weekly for 2 hours over 55 weeks showed no histopathological brain changes, including no cell death, barrier damage, or aging-related tissue alterations.