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Effects of A 60 Hz Magnetic Field of Up to 50 milliTesla on Human Tremor and EEG: A Pilot Study

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  • Shirin Davarpanah Jazi

    (Human Threshold Research Group, Imaging Program, Lawson Health Research Institute, London, ON N6A 4V2, Canada
    Department of Medical Biophysics, Western University, London, ON N6A 5C1, Canada)

  • Julien Modolo

    (Human Threshold Research Group, Imaging Program, Lawson Health Research Institute, London, ON N6A 4V2, Canada
    LTSI U1099, INSERM, Université de Rennes, 35042 Rennes, France)

  • Cadence Baker

    (Human Threshold Research Group, Imaging Program, Lawson Health Research Institute, London, ON N6A 4V2, Canada
    School of Kinesiology, Western University, London, ON N6A 3K7, Canada)

  • Sebastien Villard

    (Human Threshold Research Group, Imaging Program, Lawson Health Research Institute, London, ON N6A 4V2, Canada
    Department of Medical Biophysics, Western University, London, ON N6A 5C1, Canada)

  • Alexandre Legros

    (Human Threshold Research Group, Imaging Program, Lawson Health Research Institute, London, ON N6A 4V2, Canada
    Department of Medical Biophysics, Western University, London, ON N6A 5C1, Canada
    School of Kinesiology, Western University, London, ON N6A 3K7, Canada
    Department of Medical Imaging, Western University, London, ON N6A 5W9, Canada)

Abstract

Humans are surrounded by sources of daily exposure to power-frequency (60 Hz in North America) magnetic fields (MFs). Such time-varying MFs induce electric fields and currents in living structures which possibly lead to biological effects. The present pilot study examined possible extremely low frequency (ELF) MF effects on human neuromotor control in general, and physiological postural tremor and electroencephalography (EEG) in particular. Since the EEG cortical mu-rhythm (8–12 Hz) from the primary motor cortex and physiological tremor are related, it was hypothesized that a 60 Hz MF exposure focused on this cortical region could acutely modulate human physiological tremor. Ten healthy volunteers (age: 23.8 ± 4 SD) were fitted with a MRI-compatible EEG cap while exposed to 11 MF conditions (60 Hz, 0 to 50 mT rms , 5 mT rms increments). Simultaneously, physiological tremor (recorded from the contralateral index finger) and EEG (from associated motor and somatosensory brain regions) were measured. Results showed no significant main effect of MF exposure conditions on any of the analyzed physiological tremor characteristics. In terms of EEG, no significant effects of the MF were observed for C1, C3, C5 and CP1 electrodes. However, a significant main effect was found for CP3 and CP5 electrodes, both suggesting a decreased mu-rhythm spectral power with increasing MF flux density. This is however not confirmed by Bonferroni corrected pairwise comparisons. Considering both EEG and tremor findings, no effect of the MF exposure on human motor control was observed. However, MF exposure had a subtle effect on the mu-rhythm amplitude in the brain region involved in tactile perception. Current findings are to be considered with caution due to the small size of this pilot work, but they provide preliminary insights to international agencies establishing guidelines regarding electromagnetic field exposure with new experimental data acquired in humans exposed to high mT-range MFs.

Suggested Citation

  • Shirin Davarpanah Jazi & Julien Modolo & Cadence Baker & Sebastien Villard & Alexandre Legros, 2017. "Effects of A 60 Hz Magnetic Field of Up to 50 milliTesla on Human Tremor and EEG: A Pilot Study," IJERPH, MDPI, vol. 14(12), pages 1-11, November.
    • Handle: RePEc:gam:jijerp:v:14:y:2017:i:12:p:1446-:d:120196
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