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Effect of Low Freq PEMF on Electrocardiograms


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International Journal of
Environmental Research and Public Health
Article
An Investigation on the Effect of Extremely Low Frequency Pulsed Electromagnetic Fields on Human Electrocardiograms (ECGs)
Qiang Fang 1,*, Seedahmed S. Mahmoud 1, Jiayong Yan 2 and Hui Li 3
1
2 3
* Correspondence: john.fang@rmit.edu.au; Tel.: +61-3-9925-2432 Academic Editor: Mats-Olof Mattssonto
Received: 28 June 2016; Accepted: 16 November 2016; Published: 23 November 2016
Abstract: For this investigation, we studied the effects of extremely low frequency pulse electromagnetic fields (ELF-PEMF) on the human cardiac signal. Electrocardiograms (ECGs) of 22 healthy volunteers before and after a short duration of ELF-PEMF exposure were recorded. The experiment was conducted under single-blind conditions. The root mean square (RMS) value of the recorded data was considered as comparison criteria. We also measured and analysed four important ECG time intervals before and after ELF-PEMF exposure. Results revealed that the RMS value of the ECG recordings from 18 participants (81.8% of the total participants) increased with a mean value of 3.72%. The increase in ECG voltage levels was then verified by a second experimental protocol with a control exposure. In addition to this, we used hyperbolic T-distributions (HTD) in the analysis of ECG signals to verify the change in the RR interval. It was found that there were small shifts in the frequency-domain signal before and after EMF exposure. This shift has an influence on all frequency components of the ECG signals, as all spectrums were shifted. It is shown from this investigation that a short time exposure to ELF-PEMF can affect the properties of ECG signals. Further study is needed to consolidate this finding and discover more on the biological effects of ELF-PEMF on human physiological processes.
Keywords: electrocardiograms (ECGs); extremely low frequency pulse electromagnetic fields (ELF-PEMF); time frequency analysis
1. Introduction
Over the past few decades, the beneficial therapeutic effects of selected non-ionising low-energy, time-varying electromagnetic fields (EMF) have been studied. This has led to an increased frequency of treatments for therapeutically resistant problems of the musculoskeletal system [1]. Moreover, a number of studies have investigated the therapeutic effects of extremely low frequency pulse electromagnetic fields (ELF-PEMF) in the following applications: relieving insomnia [2], accelerated bone repair and pain reduction [3,4], and dental sensory and cutaneous pain [5]. Studies [6,7] have also demonstrated that ELF-PEMF radiation facilitates the process of wound repair. A recent study [8] investigated the effects of ELF-PEMF radiation on the growth of bacterium Staphylococcus aureus, which plays a vital role in infecting wounded tissues. The results revealed that all irradiated S. aureus bacteria showed a decrease in their growth rate compared to the control samples. Graham et al. studied the relationship between field strength and biological response [9]. This study reported
School of Engineering, RMIT University, Melbourne 3000, Victoria, Australia; Seedahmed.Mahmoud@rmit.edu.au
Department of Biomedical Engineering, Shanghai University of Medicine and Health Sciences,
Shanghai 201318, China; yanjy@sumhs.edu.cn
The Fifth Affiliated Hospital of Southern Medical University, Guangzhou 510900, China; ny5y@foxmail.com
Int. J. Environ. Res. Public Health 2016, 13, 1171; doi:10.3390/ijerph13111171 www.mdpi.com/journal/ijerph

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