Investigation of Resonance Effect Caused by Local Exposure of Extremely Low Frequency Magnetic Field on Brain Signals: A Randomize Clinical Trial
Background and Objectives: Some studies have investigated the effects of extremely low frequency magnetic fields (ELF-MFs) on brain signals, but only few of them have reported that humans exposed to magnetic fields exhibit changes in brain signals at the frequency of stimulation, i.e. resonance effe...
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Qom University of Medical Sciences
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doaj-40ff38bf707c4a65ad281943e0a2046b2021-03-27T08:51:04ZfasQom University of Medical SciencesMajallah-i Dānishgāh-i ̒Ulūm-i Pizishkī-i Qum1735-77992008-13752011-04-01515360Investigation of Resonance Effect Caused by Local Exposure of Extremely Low Frequency Magnetic Field on Brain Signals: A Randomize Clinical TrialM Firuzabadi0A Shafiei Darabi1M Ghaba’ei2K Rasul Zadeh Tabataba’ei3 Tarbiat Modares University Tarbiat Modares University Tehran University of Medical Sciences Tarbiat Modares University Background and Objectives: Some studies have investigated the effects of extremely low frequency magnetic fields (ELF-MFs) on brain signals, but only few of them have reported that humans exposed to magnetic fields exhibit changes in brain signals at the frequency of stimulation, i.e. resonance effect. In most investigations, researchers usually take advantage of a uniform field which encompasses the head. The aim of present study was to expose different parts of the brain to ELF-MFs locally and to investigate variation of brain signal and resonance effect. Methods: The subjects consisting of 19 male-students with the mean age of 25.6±1.6 years participated in this study. Local ELF-MFs with 3, 5, 10, 17 and 45Hz frequencies and 240 μT intensity was applied on five points (T3, T4, Cz, F3 and F4) of participants scalp Separately in 10-20 system. In the end, relative power over this points in common frequency bands and at the frequency of magnetic fields was evaluated by paired t-test. Results: Exposure of Central area by local magnetic field caused significant change (p<0.05) in the forehead alpha band. Reduction in the alpha band over central area was observed when temporal area was exposed to ELF MF. Conclusion: The results showed that resonance effect in the brain signals caused by local magnetic field exposure was not observed and change in every part of the relative power spectrum might occur. The changes in the EEG bands were not limited necessarily to the exposure point.http://journal.muq.ac.ir/article-1-527-en.htmlmagneticsbrainsbrain waveselectroencephalographyradio wavesa randomize clinical trial. |
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language |
fas |
format |
Article |
sources |
DOAJ |
author |
M Firuzabadi A Shafiei Darabi M Ghaba’ei K Rasul Zadeh Tabataba’ei |
spellingShingle |
M Firuzabadi A Shafiei Darabi M Ghaba’ei K Rasul Zadeh Tabataba’ei Investigation of Resonance Effect Caused by Local Exposure of Extremely Low Frequency Magnetic Field on Brain Signals: A Randomize Clinical Trial Majallah-i Dānishgāh-i ̒Ulūm-i Pizishkī-i Qum magnetics brains brain waves electroencephalography radio waves a randomize clinical trial. |
author_facet |
M Firuzabadi A Shafiei Darabi M Ghaba’ei K Rasul Zadeh Tabataba’ei |
author_sort |
M Firuzabadi |
title |
Investigation of Resonance Effect Caused by Local Exposure of Extremely Low Frequency Magnetic Field on Brain Signals: A Randomize Clinical Trial |
title_short |
Investigation of Resonance Effect Caused by Local Exposure of Extremely Low Frequency Magnetic Field on Brain Signals: A Randomize Clinical Trial |
title_full |
Investigation of Resonance Effect Caused by Local Exposure of Extremely Low Frequency Magnetic Field on Brain Signals: A Randomize Clinical Trial |
title_fullStr |
Investigation of Resonance Effect Caused by Local Exposure of Extremely Low Frequency Magnetic Field on Brain Signals: A Randomize Clinical Trial |
title_full_unstemmed |
Investigation of Resonance Effect Caused by Local Exposure of Extremely Low Frequency Magnetic Field on Brain Signals: A Randomize Clinical Trial |
title_sort |
investigation of resonance effect caused by local exposure of extremely low frequency magnetic field on brain signals: a randomize clinical trial |
publisher |
Qom University of Medical Sciences |
series |
Majallah-i Dānishgāh-i ̒Ulūm-i Pizishkī-i Qum |
issn |
1735-7799 2008-1375 |
publishDate |
2011-04-01 |
description |
Background and Objectives: Some studies have investigated the effects of extremely low frequency magnetic fields (ELF-MFs) on brain signals, but only few of them have reported that humans exposed to magnetic fields exhibit changes in brain signals at the frequency of stimulation, i.e. resonance effect. In most investigations, researchers usually take advantage of a uniform field which encompasses the head. The aim of present study was to expose different parts of the brain to ELF-MFs locally and to investigate variation of brain signal and resonance effect.
Methods: The subjects consisting of 19 male-students with the mean age of 25.6±1.6 years participated in this study. Local ELF-MFs with 3, 5, 10, 17 and 45Hz frequencies and 240 μT intensity was applied on five points (T3, T4, Cz, F3 and F4) of participants scalp Separately in 10-20 system. In the end, relative power over this points in common frequency bands and at the frequency of magnetic fields was evaluated by paired t-test.
Results: Exposure of Central area by local magnetic field caused significant change (p<0.05) in the forehead alpha band. Reduction in the alpha band over central area was observed when temporal area was exposed to ELF MF.
Conclusion: The results showed that resonance effect in the brain signals caused by local magnetic field exposure was not observed and change in every part of the relative power spectrum might occur. The changes in the EEG bands were not limited necessarily to the exposure point. |
topic |
magnetics brains brain waves electroencephalography radio waves a randomize clinical trial. |
url |
http://journal.muq.ac.ir/article-1-527-en.html |
work_keys_str_mv |
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