Extremely low-frequency magnetic fields of transformers and possible biological and health effects

Electromagn Biol Med · 2014 · Unclear · Very low evidence

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UnclearVery low evidencePaper 2752

Study snapshot

PublicationElectromagn Biol Med · 2014

Study typeexposure_assessment

Reported directionUnclear

Evidence ratingVery low

Abstract

Physiological processes in organisms can be influenced by extremely low-frequency (ELF) electromagnetic energy. Biological effect studies have great importance; as well as measurement studies since they provide information on the real exposure situations. In this study, the leakage magnetic fields around a transformer were measured in an apartment building in Küçükçekmece, Istanbul, and the measurement results were evaluated with respect to the international exposure standards. The transformer station was on the bottom floor of a three-floor building. It was found that people living and working in the building were exposed to ELF magnetic fields higher than the threshold magnetic field value of the International Agency for Research on Cancer (IARC). Many people living in this building reported health complaints such as immunological problems of their children. There were child-workers working in the textile factories located in the building. Safe distances or areas for these people should be recommended. Protective measures could be implemented to minimize these exposures. Further residential exposure studies are needed to demonstrate the exposure levels of ELF magnetic fields. Precautions should, therefore, be taken either to reduce leakage or minimize the exposed fields. Shielding techniques should be used to minimize the leakage magnetic fields in such cases.

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 typeexposure_assessment

Effect directionunclear

PopulationPeople living and working in an apartment building with a transformer station on the bottom floor (including child-workers in textile factories) in Küçükçekmece, Istanbul.

Sample sizeNot supplied

ExposureELF

Evidence strengthVery lowConfidence: 74% · Peer reviewed: yes

Main findings

Leakage magnetic fields around a transformer station in a three-floor apartment building were measured and evaluated against international exposure standards. The authors report that residents and workers in the building were exposed to ELF magnetic fields higher than the IARC threshold magnetic field value, and that many people in the building reported health complaints (e.g., immunological problems in children).

Outcomes measured

Leakage magnetic field levels around a transformer in a residential building
Comparison of measured fields to international exposure standards / IARC threshold value
Self-reported health complaints (e.g., immunological problems in children)

Limitations

No numerical exposure values, measurement protocol details, or frequency information provided in the abstract
No sample size or systematic health outcome assessment described; health complaints are reported anecdotally
Single-building setting limits generalizability
Causal inference about health effects is not supported by the described design

View raw extracted JSON

{
  "study_type": "exposure_assessment",
  "exposure": {
    "band": "ELF",
    "source": "transformer",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "People living and working in an apartment building with a transformer station on the bottom floor (including child-workers in textile factories) in Küçükçekmece, Istanbul.",
  "sample_size": null,
  "outcomes": [
    "Leakage magnetic field levels around a transformer in a residential building",
    "Comparison of measured fields to international exposure standards / IARC threshold value",
    "Self-reported health complaints (e.g., immunological problems in children)"
  ],
  "main_findings": "Leakage magnetic fields around a transformer station in a three-floor apartment building were measured and evaluated against international exposure standards. The authors report that residents and workers in the building were exposed to ELF magnetic fields higher than the IARC threshold magnetic field value, and that many people in the building reported health complaints (e.g., immunological problems in children).",
  "effect_direction": "unclear",
  "limitations": [
    "No numerical exposure values, measurement protocol details, or frequency information provided in the abstract",
    "No sample size or systematic health outcome assessment described; health complaints are reported anecdotally",
    "Single-building setting limits generalizability",
    "Causal inference about health effects is not supported by the described design"
  ],
  "evidence_strength": "very_low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "extremely low-frequency",
    "ELF",
    "magnetic fields",
    "transformer",
    "leakage magnetic field",
    "residential exposure",
    "occupational exposure",
    "IARC",
    "exposure standards",
    "shielding"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.62,
      "reason": "Includes workers (including child-workers) in textile factories located in the building with transformer-related ELF magnetic field exposure."
    }
  ]
}

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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: 10.3109/15368378.2013.834447
PubMed: 24131394

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