Extremely Low Frequency Electromagnetic Field from Convective Air Warming System on Temperature Selection and Distance.

Iranian journal of public health · 2014 · Unclear · Insufficient evidence

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ELF-EMF intensity decreased with increasing distance and was higher at higher temperature settings. At 30 cm, mean ELF-EMF values were 18.63, 18.44, 18.23, and 17.92 mG for high, medium, low, and ambient settings, respectively. The authors report that within …

Study snapshot

PublicationIranian journal of public health · 2014

Study typeexposure_assessment

Reported directionUnclear

Evidence ratingInsufficient

Abstract

BACKGROUND: Hypothermia generates potentially severe complications in operating or recovery room. Forced air warmer is effective to maintain body temperature. Extremely low frequency electromagnetic field (ELF-EMF) is harmful to human body and mainly produced by electronic equipment including convective air warming system. We investigated ELF-EMF from convective air warming device on various temperature selection and distance for guideline to protect medical personnel and patients. METHODS: The intensity of ELF-EMF was measured as two-second interval for five minutes on various distance (0.1, 0.2, 0.3, 0.5 and 1meter) and temperature selection (high, medium, low and ambient). All of electrical devices were off including lamp, computer and air conditioner. Groups were compared using one-way ANOVA. P<0.05 was considered significant. RESULTS: Mean values of ELF-EMF on the distance of 30 cm were 18.63, 18.44, 18.23 and 17.92 milligauss (mG) respectively (high, medium, low and ambient temperature set). ELF-EMF of high temperature set was higher than data of medium, low and ambient set in all the distances. CONCLUSION: ELF-EMF from convective air warming system is higher in condition of more close location and higher temperature. ELF-EMF within thirty centimeters exceeds 2mG recommended by Swedish TCO guideline.

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

PopulationNot supplied

Sample sizeNot supplied

ExposureELF · measured at 2-second intervals for 5 minutes at each condition

Evidence strengthInsufficientConfidence: 78% · Peer reviewed: yes

Main findings

Outcomes measured

ELF-EMF intensity (milligauss, mG) by distance and temperature setting
Comparison to Swedish TCO 2 mG guideline threshold

Limitations

No frequency characteristics of the ELF-EMF reported
No information on device model/brand or measurement instrument/calibration reported in abstract
No direct health outcomes assessed; study measures field intensity only
Sample size/number of repeated measurements per condition not stated beyond timing description

View raw extracted JSON

{
  "study_type": "exposure_assessment",
  "exposure": {
    "band": "ELF",
    "source": "convective air warming system (forced air warmer)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "measured at 2-second intervals for 5 minutes at each condition"
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "ELF-EMF intensity (milligauss, mG) by distance and temperature setting",
    "Comparison to Swedish TCO 2 mG guideline threshold"
  ],
  "main_findings": "ELF-EMF intensity decreased with increasing distance and was higher at higher temperature settings. At 30 cm, mean ELF-EMF values were 18.63, 18.44, 18.23, and 17.92 mG for high, medium, low, and ambient settings, respectively. The authors report that within 30 cm the measured ELF-EMF exceeded the 2 mG level recommended by the Swedish TCO guideline.",
  "effect_direction": "unclear",
  "limitations": [
    "No frequency characteristics of the ELF-EMF reported",
    "No information on device model/brand or measurement instrument/calibration reported in abstract",
    "No direct health outcomes assessed; study measures field intensity only",
    "Sample size/number of repeated measurements per condition not stated beyond timing description"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "extremely low frequency",
    "ELF-EMF",
    "forced air warmer",
    "convective air warming system",
    "operating room",
    "exposure measurement",
    "milligauss",
    "distance",
    "temperature setting",
    "Swedish TCO guideline"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.62,
      "reason": "Exposure measurements relevant to medical personnel working near operating/recovery room equipment."
    }
  ]
}

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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: 26171355

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