Note: This study found no significant biological effects under its experimental conditions. We include all studies for scientific completeness.
Effects of 915 MHz electromagnetic-field radiation in TEM cell on the blood-brain barrier and neurons in the rat brain
No Effects Found
Authors not listed · 2009
Japanese study found no blood-brain barrier damage from 915 MHz radiation, contradicting earlier alarming Swedish research.
Plain English Summary
Summary written for general audiences
Japanese researchers exposed 64 rats to 915 MHz electromagnetic fields (similar to older cell phones) for 2 hours at various power levels, then examined their brains 14 and 50 days later. They found no evidence of blood-brain barrier leakage or brain cell damage, contradicting an earlier Swedish study that reported such effects. This study suggests 915 MHz radiation may not damage the brain barrier as previously claimed.
Exposure Information
Cite This Study
Unknown (2009). Effects of 915 MHz electromagnetic-field radiation in TEM cell on the blood-brain barrier and neurons in the rat brain.
Show BibTeX
@article{effects_of_915_mhz_electromagnetic_field_radiation_in_tem_cell_on_the_blood_brain_barrier_and_neurons_in_the_rat_brain_ce855,
author = {Unknown},
title = {Effects of 915 MHz electromagnetic-field radiation in TEM cell on the blood-brain barrier and neurons in the rat brain},
year = {2009},
doi = {10.1667/RR1542.1},
}Quick Questions About This Study
No, this study found no evidence of blood-brain barrier leakage in rats exposed to 915 MHz electromagnetic fields for 2 hours, even when examined up to 50 days later. This contradicts earlier Swedish research claiming such damage occurs.
Researchers tested four exposure levels: 0 (control), 0.02, 0.2, and 2.0 watts per kilogram. These range from very low to moderately high compared to typical cell phone radiation exposure during calls.
No, dark neurons (damaged brain cells) were rarely present in any group, with no statistically significant difference between EMF-exposed and control rats. This finding also contradicts the earlier Swedish study's claims.
Rat brains were examined at two time points: 14 days and 50 days after the single 2-hour EMF exposure. This allowed researchers to detect both short-term and longer-lasting potential damage.
The Japanese researchers followed the same protocol as the Swedish team but found opposite results, suggesting the original findings may have been due to experimental artifacts, statistical chance, or other methodological differences not apparent in published reports.