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Brain & Nervous System

The alteration of spontaneous low frequency oscillations caused by acute electromagnetic fields exposure

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Lv B, Chen Z, Wu T, Shao Q, Yan D, Ma L, Lu K, Xie Y. · 2013

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LTE RF-EMF exposure modulated spontaneous low frequency fluctuations in some brain regions.

Plain English Summary

Summary written for general audiences

Eighteen subjects participated in a double-blind, crossover, randomized and counterbalanced experiment including real and sham exposure sessions. Resting-state fMRI signals were collected before and after exposure, with the radiation source placed close to the right ear. After real exposure, decreased ALFF values were found in the left superior temporal gyrus, left middle temporal gyrus, right superior temporal gyrus, right medial frontal gyrus, and right paracentral lobule.

Why This Matters

The study measured amplitude of low frequency fluctuation (ALFF) and fractional ALFF (fALFF) to characterize spontaneous brain activity. Decreased fALFF values were also detected in the right medial frontal gyrus and right paracentral lobule after real exposure. The researchers designed a controllable near-field LTE RF-EMF exposure environment for the study. The experiment included both real and sham exposure sessions, allowing comparison within a double-blind, crossover, randomized and counterbalanced design.

Exposure Details

SAR
2.18,2.36,0.9,1.07 W/kg
Source/Device
2.573 GHz
Exposure Duration
continuous for 30 minutes

Exposure Context

This study used 2.18,2.36,0.9,1.07 W/kg for SAR (device absorption):

Building Biology guidelines are practitioner-based limits from real-world assessments. BioInitiative Report recommendations are based on peer-reviewed science. Check Your Exposure to compare your own measurements.

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 2.18,2.36,0.9,1.07 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern range (Building Biology)FCC limit is 2 times higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 2.57 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 2.57 GHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

The motivation of this study is to evaluate the possible alteration of regional resting state brain activity induced by the acute radiofrequency electromagnetic field (RF-EMF) exposure (30 min) of Long Term Evolution (LTE) signal.

We designed a controllable near-field LTE RF-EMF exposure environment. Eighteen subjects participate...

We found the decreased ALFF value around in left superior temporal gyrus, left middle temporal gyrus...

The study provided the evidences that 30 min LTE RF-EMF exposure modulated the spontaneous low frequency fluctuations in some brain regions.

Cite This Study
Lv B, Chen Z, Wu T, Shao Q, Yan D, Ma L, Lu K, Xie Y. (2013). The alteration of spontaneous low frequency oscillations caused by acute electromagnetic fields exposure Clin Neurophysiol. 2013 Sep 4; doi: 10.1016/j.clinph.2013.07.018.
Show BibTeX
@article{b_2013_the_alteration_of_spontaneous_135,
  author = {Lv B and Chen Z and Wu T and Shao Q and Yan D and Ma L and Lu K and Xie Y.},
  title = {The alteration of spontaneous low frequency oscillations caused by acute electromagnetic fields exposure},
  year = {2013},
  
  url = {https://www.sciencedirect.com/science/article/abs/pii/S1388245713009760},
}

Quick Questions About This Study

The exposure used a Long Term Evolution (LTE) radiofrequency electromagnetic field signal.
Eighteen subjects participated in a double-blind, crossover, randomized and counterbalanced experiment.
Decreased ALFF values were found in the left superior temporal gyrus, left middle temporal gyrus, right superior temporal gyrus, right medial frontal gyrus, and right paracentral lobule.
The study provided evidence that 30 min LTE RF-EMF exposure modulated the spontaneous low frequency fluctuations in some brain regions.
Researchers collected resting-state fMRI signals and used amplitude of low frequency fluctuation (ALFF) and fractional ALFF (fALFF) to characterize spontaneous brain activity.