Influence of pregnancy stage and fetus position on the whole-body and local exposure of the fetus to RF-EMF.

Physics in medicine and biology · 2014 · Mixed · Low evidence

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MixedLow evidencePaper 4676

Study snapshot

PublicationPhysics in medicine and biology · 2014

Study typeexposure_assessment

Reported directionMixed

Evidence ratingLow

Abstract

This paper analyzes the influence of pregnancy stage and fetus position on the whole-body and brain exposure of the fetus to radiofrequency electromagnetic fields. Our analysis is performed using semi-homogeneous pregnant woman models between 8 and 32 weeks of amenorrhea. By analyzing the influence of the pregnancy stage on the environmental whole-body and local exposure of a fetus in vertical position, head down or head up, in the 2100 MHz frequency band, we concluded that both whole-body and average brain exposures of the fetus decrease during the first pregnancy trimester, while they advance during the pregnancy due to the rapid weight gain of the fetus in these first stages. From the beginning of the second trimester, the whole-body and the average brain exposures are quite stable because the weight gains are quasi proportional to the absorbed power increases. The behavior of the fetus whole-body and local exposures during pregnancy for a fetus in the vertical position with the head up were found to be of a similar level, when compared to the position with the head down they were slightly higher, especially in the brain.

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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 directionmixed

PopulationFetus in semi-homogeneous pregnant woman models (8–32 weeks of amenorrhea)

Sample sizeNot supplied

ExposureRF · 2100 MHz

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Using pregnant woman models (8–32 weeks), fetal whole-body and average brain exposures at 2100 MHz decreased during the first trimester and then increased with fetal weight gain in early stages. From the beginning of the second trimester, whole-body and average brain exposures were reported as quite stable. Exposures for head-up vertical position were similar to head-down but slightly higher, especially in the brain.

Outcomes measured

Whole-body exposure of the fetus
Average brain exposure of the fetus
Influence of pregnancy stage on exposure
Influence of fetus position (vertical, head down, head up) on exposure

Limitations

Model-based analysis using semi-homogeneous pregnant woman models (not direct measurements in humans)
No quantitative exposure metrics (e.g., SAR values) reported in the abstract
Exposure scenario described as environmental at 2100 MHz; details of source/configuration not provided in the abstract

View raw extracted JSON

{
  "study_type": "exposure_assessment",
  "exposure": {
    "band": "RF",
    "source": "environmental",
    "frequency_mhz": 2100,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Fetus in semi-homogeneous pregnant woman models (8–32 weeks of amenorrhea)",
  "sample_size": null,
  "outcomes": [
    "Whole-body exposure of the fetus",
    "Average brain exposure of the fetus",
    "Influence of pregnancy stage on exposure",
    "Influence of fetus position (vertical, head down, head up) on exposure"
  ],
  "main_findings": "Using pregnant woman models (8–32 weeks), fetal whole-body and average brain exposures at 2100 MHz decreased during the first trimester and then increased with fetal weight gain in early stages. From the beginning of the second trimester, whole-body and average brain exposures were reported as quite stable. Exposures for head-up vertical position were similar to head-down but slightly higher, especially in the brain.",
  "effect_direction": "mixed",
  "limitations": [
    "Model-based analysis using semi-homogeneous pregnant woman models (not direct measurements in humans)",
    "No quantitative exposure metrics (e.g., SAR values) reported in the abstract",
    "Exposure scenario described as environmental at 2100 MHz; details of source/configuration not provided in the abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "pregnancy stage",
    "fetus position",
    "fetal exposure",
    "whole-body exposure",
    "brain exposure",
    "RF-EMF",
    "2100 MHz",
    "modeling"
  ],
  "suggested_hubs": [
    {
      "slug": "who-icnirp",
      "weight": 0.2,
      "reason": "RF-EMF exposure assessment relevant to guideline discussions, but no explicit policy content in abstract."
    }
  ]
}

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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: 10.1088/0031-9155/59/17/4913
PubMed: 25098501

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