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

Cardiovascular

Effects of GSM 900 MHz on Middle Cerebral Artery Blood Flow Assessed by Transcranial Doppler Sonography.

No Effects Found

Ghosn R, Thuróczy G, Loos N, Brenet-Dufour V, Liabeuf S, de Seze R, Selmaoui B. · 2012

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Twenty minutes of 900 MHz cell phone radiation produced no detectable changes in brain blood flow in this controlled study.

Plain English Summary

Summary written for general audiences

Researchers exposed 29 volunteers to 900 MHz cell phone radiation for 20 minutes while measuring blood flow in their brain arteries using ultrasound technology. They found no changes in blood flow velocity or other circulation measures during or after exposure. This suggests that short-term cell phone use doesn't immediately affect blood circulation in the brain.

Why This Matters

This study provides reassuring evidence that acute cell phone exposure doesn't disrupt cerebral blood flow, addressing concerns about immediate vascular effects from RF radiation. The researchers used a solid double-blind, crossover design where each participant served as their own control, which strengthens the reliability of their findings. However, we should view this single study within the broader context of EMF research. While 20 minutes of 900 MHz exposure showed no acute vascular effects, this doesn't address longer-term cumulative impacts or other biological mechanisms that research has identified. The reality is that your brain's blood vessels appear resilient to brief RF exposure, but this represents just one piece of the larger EMF health puzzle that includes oxidative stress, cellular changes, and potential long-term effects that require different study approaches to detect.

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

Specific exposure levels were not quantified in this study. The study examined exposure from: 900 MHz Duration: 20 minutes

Study Details

The aim of the present study was to investigate the effect of acute exposure to a radio frequency electromagnetic field (RF EMF) generated by a mobile phone operating in the Global System for Mobile Communication (GSM) 900 MHz on cerebral blood flow.

Twenty-nine volunteers attended two experimental sessions: a sham exposure session and a real exposu...

No significant changes were detected in studied variables in middle cerebral arteries during sham or...

Twenty minutes of RF exposure to a mobile phone does not seem to affect the cerebral circulation.

Cite This Study
Ghosn R, Thuróczy G, Loos N, Brenet-Dufour V, Liabeuf S, de Seze R, Selmaoui B. (2012). Effects of GSM 900 MHz on Middle Cerebral Artery Blood Flow Assessed by Transcranial Doppler Sonography. Radiat Res. 178(6):543-550, 2012.
Show BibTeX
@article{r_2012_effects_of_gsm_900_3039,
  author = {Ghosn R and Thuróczy G and Loos N and Brenet-Dufour V and Liabeuf S and de Seze R and Selmaoui B.},
  title = {Effects of GSM 900 MHz on Middle Cerebral Artery Blood Flow Assessed by Transcranial Doppler Sonography.},
  year = {2012},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/23106209/},
}
PubMed: 23106209

Cited By (19 papers)

Quick Questions About This Study

A 2012 study found that 20 minutes of 900 MHz cell phone radiation exposure did not affect brain blood flow. Researchers measured blood flow velocity in middle cerebral arteries of 29 volunteers using ultrasound technology and detected no significant changes during or after exposure.
Transcranial Doppler ultrasound can accurately measure brain blood flow changes from EMF exposure. A 2012 study used this technology to monitor middle cerebral artery blood flow during 900 MHz radiation exposure, finding no detectable changes in circulation patterns or velocity measurements.
A 20-minute exposure to 900 MHz cell phone radiation was insufficient to affect brain artery function. The 2012 study found no changes in blood flow velocity, pulsatility index, or resistance index in middle cerebral arteries during this exposure duration.
Brain artery measurements including blood flow velocity, pulsatility index, and resistance index can detect EMF effects. However, a 2012 study measuring these parameters in middle cerebral arteries found no significant changes during 900 MHz cell phone radiation exposure.
GSM phones do not immediately change cerebral blood circulation patterns according to research. A 2012 study exposing volunteers to 900 MHz GSM radiation for 20 minutes found no significant effects on middle cerebral artery blood flow or circulation measures.