An Investigation on the Effect of ELF Pulsed Electromagnetic Fields on Human Electrocardiograms

2016 · Mixed · Low evidence

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MixedLow evidencePaper 1416

Study snapshot

Publicationmanual · 2016

Study typeother

Reported directionMixed

Evidence ratingLow

Abstract

An Investigation on the Effect of ELF Pulsed Electromagnetic Fields on Human Electrocardiograms Fang Q, Mahmoud SS, Yan J, Li H. An Investigation on the Effect of Extremely Low Frequency Pulsed Electromagnetic Fields on Human Electrocardiograms (ECGs). Int J Environ Res Public Health. 2016 Nov 23;13(11). pii: E1171. 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. ncbi.nlm.nih.gov

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeother

Effect directionmixed

Population22 healthy volunteers

Sample size22

ExposureELF · short duration

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

ECGs from 22 healthy volunteers were recorded before and after short-duration ELF-PEMF exposure under single-blind conditions. The RMS value increased in 18/22 participants (81.8%) with a mean increase of 3.72%, and the increase in ECG voltage levels was verified by a second protocol with a control exposure. Small shifts in frequency-domain signals and changes related to the RR interval were reported before vs. after exposure.

Outcomes measured

ECG root mean square (RMS) value
ECG time intervals (four intervals; specific intervals not listed in abstract)
RR interval (frequency-domain analysis; hyperbolic T-distributions)
Frequency-domain shifts in ECG spectrum

Limitations

Small sample size (n=22)
Exposure parameters (e.g., field strength, frequency) not reported in the abstract
Short-duration exposure only
Single-blind design (not double-blind)
Outcomes described as small shifts; clinical significance not established in abstract

View raw extracted JSON

{
  "study_type": "other",
  "exposure": {
    "band": "ELF",
    "source": "pulsed electromagnetic fields (PEMF) exposure",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "short duration"
  },
  "population": "22 healthy volunteers",
  "sample_size": 22,
  "outcomes": [
    "ECG root mean square (RMS) value",
    "ECG time intervals (four intervals; specific intervals not listed in abstract)",
    "RR interval (frequency-domain analysis; hyperbolic T-distributions)",
    "Frequency-domain shifts in ECG spectrum"
  ],
  "main_findings": "ECGs from 22 healthy volunteers were recorded before and after short-duration ELF-PEMF exposure under single-blind conditions. The RMS value increased in 18/22 participants (81.8%) with a mean increase of 3.72%, and the increase in ECG voltage levels was verified by a second protocol with a control exposure. Small shifts in frequency-domain signals and changes related to the RR interval were reported before vs. after exposure.",
  "effect_direction": "mixed",
  "limitations": [
    "Small sample size (n=22)",
    "Exposure parameters (e.g., field strength, frequency) not reported in the abstract",
    "Short-duration exposure only",
    "Single-blind design (not double-blind)",
    "Outcomes described as small shifts; clinical significance not established in abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "extremely low frequency",
    "ELF",
    "pulsed electromagnetic fields",
    "PEMF",
    "electrocardiogram",
    "ECG",
    "RR interval",
    "frequency-domain analysis",
    "single-blind",
    "healthy volunteers"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.2,
      "reason": "Study involves ELF exposure, but the abstract does not specify occupational context; hub relevance is weak."
    }
  ]
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: Not supplied
PubMed: Not supplied

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