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Neurophysiological and behavioral effects of a 60 Hz, 1,800 μT magnetic field in humans.

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Legros A, Corbacio M, Beuter A, Modolo J, Goulet D, Prato FS, Thomas AW. · 2012

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One hour of power-frequency magnetic field exposure impaired balance and increased tremor in healthy adults, suggesting immediate neurological effects.

Plain English Summary

Summary written for general audiences

Researchers exposed people to strong 60 Hz magnetic fields (like power lines emit) for one hour. The exposure impaired balance and increased hand tremor, even though brain waves stayed normal. This shows power-frequency fields can affect movement control in subtle ways.

Why This Matters

This study provides compelling evidence that power-frequency magnetic fields can acutely affect human neurological function, specifically our involuntary motor control systems. What makes these findings particularly significant is that the researchers detected measurable changes in balance and tremor at exposure levels that are elevated but not extreme - roughly 18 times higher than typical household magnetic field levels. The fact that these motor effects occurred without corresponding changes in cortical brain activity suggests that magnetic fields may influence deeper brain structures or peripheral nervous system pathways that control automatic functions. This research adds to a growing body of evidence that our nervous systems are more sensitive to electromagnetic exposures than previously understood, and it challenges the assumption that effects must be detectable in surface brain activity to be biologically meaningful.

Exposure Details

Magnetic Field
1.8 mG
Source/Device
60 Hz
Exposure Duration
1h

Exposure Context

This study used 1.8 mG for magnetic fields:

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: 1.8 mGExtreme Concern - 5 mGFCC Limit - 2,000 mGEffects observed in the Severe Concern rangeFCC limit is 1,111x higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 60 Hz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 60 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Study Details

The aim of this study is to observe Neurophysiological and behavioral effects of a 60 Hz, 1,800 μT magnetic field in humans.

The present study aimed to investigate the effects of a 60 Hz, 1,800 μT MF exposure on neurophysiolo...

Though results from this study suggest a reduction of human standing balance with MF exposure, as we...

These results suggest that 1 h of 60 Hz, 1,800 μT MF exposure may modulate human involuntary motor control without being detected in the cortical electrical activity.

Cite This Study
Legros A, Corbacio M, Beuter A, Modolo J, Goulet D, Prato FS, Thomas AW. (2012). Neurophysiological and behavioral effects of a 60 Hz, 1,800 μT magnetic field in humans. Eur J Appl Physiol. 112(5):1751-1762, 2012.
Show BibTeX
@article{a_2012_neurophysiological_and_behavioral_effects_671,
  author = {Legros A and Corbacio M and Beuter A and Modolo J and Goulet D and Prato FS and Thomas AW.},
  title = {Neurophysiological and behavioral effects of a 60 Hz, 1,800 μT magnetic field in humans.},
  year = {2012},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/21894451/},
}
PubMed: 21894451

Cited By (26 papers)

Quick Questions About This Study

Yes, a 2012 study found that one-hour exposure to strong 60 Hz magnetic fields (1,800 μT) reduced standing balance in humans. This power-line frequency exposure affected movement control even though brain wave activity remained normal throughout the test period.
Research shows that 60 Hz magnetic field exposure at 1,800 μT increases physiological hand tremor amplitude. The tremor changes occurred specifically in frequency ranges associated with central nervous system control, suggesting power-frequency fields can affect involuntary motor functions.
Studies demonstrate that just one hour of 60 Hz magnetic field exposure at 1,800 μT can impair human motor control. The effects on balance and tremor occurred without detectable changes in brain electrical activity or voluntary movement control.
No, exposure to 1,800 μT 60 Hz magnetic fields for one hour did not affect brain wave patterns (EEG). However, the same exposure level did impair balance and increase hand tremor, showing that motor effects can occur without detectable brain wave changes.
Yes, research confirms that 60 Hz magnetic fields at 1,800 μT can modulate involuntary motor control without being detected in cortical brain activity. The study found impaired balance and increased tremor despite normal EEG readings and voluntary motor function.