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ECG Changes in Humans Exposed to 50 Hz Magnetic Fields
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ECG Changes in Humans Exposed to 50 Hz Magnetic Fields: Srdjan S. Borjanovic, et al. Institute of Occupational Health “Dr. Dragomir Karajovic”, Serbia and Montenegro —Possible health issues of ELF EMFs include cardiovascular effects since both electrocardiogram and heart‐rate changes have been reported in the literature. A non‐linear relationship between field strength and biological response has been reported in some studies. In this study, a total of 59 subjects, divided into three independent magnetic field strength groups, were compared. A calculated 12‐hour time weighted average (TWA) value of the fields was used as an exposure metric for each of the three locations (“low”: 0.067 µT, “medium”: 1.18 µT and “high”: 5.2 µT) and subsequently used to estimate workers’ exposure at these sites. Electrocardiograms were recorded in the resting position. Five parameters were derived from the ECG: heart rate (HR), duration of P wave and QRS wave, and duration of PR and QT intervals. The QT intervals were normalized to a heart rate of 60 (QTc). The obtained data were analyzed first by means of multivariate analysis of covariance and then oneway univariate analyses of covariances (ANCOVA) using exposure duration as a covariate. Only the ANCOVA on the QTc interval was significant. Our results suggest that the relationship between field strength and response is non‐linear: the adjusted mean QTc values are similar between the “low” and the “high” group, but significantly lower in the “medium” group. One possible interpretation of our results is that a specific exposure pattern might be responsible for the non‐linear effects observed, so that generally, characterizing exposure to electric and magnetic fields using simple metrics such as TWA may be insufficient.
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“MRI fields (1.5–3 tesla) induce reversible ECG waveform changes via magnetohydrodynamic effects, that result in altered sinoatrial currents associated with reduced blood flow [23,28,29].”
From The Heart’s Electromagnetic Field in Emotions, Empathy and Human Connection: Biosensor-Derived Insights into Heart–Brain Axis Mechanisms and a Basis for Novel BioMagnetoTherapies (2026) · cites this paper as [29]
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“Extremely low frequency fields (ELFs) (50/60 Hz) can alter cardiac electrophysiology, producing changes in QTc dynamics, heart rate, and calcium flux [23,29].”
From The Heart’s Electromagnetic Field in Emotions, Empathy and Human Connection: Biosensor-Derived Insights into Heart–Brain Axis Mechanisms and a Basis for Novel BioMagnetoTherapies (2026) · cites this paper as [29]
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“whereas incoherent or intense exposures can worsen injury through Ca2+ overload, mitochondrial dysfunction, or destabilization of wave propagation [Figure 2] [24,29,82].”
From The Heart’s Electromagnetic Field in Emotions, Empathy and Human Connection: Biosensor-Derived Insights into Heart–Brain Axis Mechanisms and a Basis for Novel BioMagnetoTherapies (2026) · cites this paper as [29]
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McNamee, D., Legros, A. G., Krewski, D. R., Wisenberg, G., Prato, F. S., & Thomas, A. W. (2009) · International Archives of Occupational and Environmental Health · doi:10.1007/s00420-009-0404-y · Cited by 54
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ECG changes in factory workers exposed to 27.2 MHz radiofrequency radiation
Chen, Q., Xu, G., Lang, L., Yang, A., Li, S., Yang, L., Li, C., Huang, H., & Li, T. (2012) · Bioelectromagnetics · doi:10.1002/bem.21771 · Cited by 6
Elmas, O., & Çömlekçı, S. (2015) · Bioelectromagnetics · doi:10.1002/bem.21922 · Cited by 4
Metadata
- Authors
- Borjanovic, S. S., Jankovic, S. M., & Pejovic, Z.
- Affiliations
- Institute of Occupational Health “Dr. Dragomir Karajovic”
- Occupational Safety and Environmental Protection Company “Beograd” Serbia and Montenegro
- Corresponding author
- Borjanovic, Srdjan S.
- ORCID
- Jankovic, Srdjan M.
- Venue
- Journal of Occupational Health
- Publisher
- Oxford University Press (OUP)
- Published
- 2005-09
- Volume
- 47
- Issue
- 5
- Pages
- 391-396
- ISSN
- 1341-9145 (ISSN-L)
- 1348-9585
- OpenAlex
- W2049123012
- Cited by
- 13
- References
- 13
- Citations by year
- 2026: 2 · 2024: 1 · 2019: 1 · 2018: 1 · 2016: 1 · 2015: 1 · 2012: 2
- FWCI
- 0.20
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of Occupational Health (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biophysics › Electromagnetic Fields and Biological Effects
- Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Magnetic and Electromagnetic Effects
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Heart Rate Variability and Autonomic Control
- Keywords
- extremely low frequency magnetic fields, 50 Hz magnetic field, electrocardiographic changes, QTc interval, heart rate, P-wave duration, QRS duration, PR interval, exposure metrics, nonlinear dose-response relationship, cardiovascular effects, occupational exposure
- MeSH terms
- Adult, Dose-Response Relationship, Radiation, Electrocardiography, Electromagnetic Fields, Heart Rate, Humans, Male, Occupational Health
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