Post-continuous whole body exposure of rabbits to 650 MHz electromagnetic fields: effects on liver, spleen, and brain.

Radiation and environmental biophysics · 2005 · Mixed · Low evidence

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MixedLow evidencePaper 5191

Study snapshot

PublicationRadiation and environmental biophysics · 2005

Study typeanimal

Reported directionMixed

Evidence ratingLow

Abstract

This study deals with the effects of post (12 or 18 months) whole body continuous (2 years) exposure of rabbits to 650 MHz electromagnetic fields (EMF) that are characteristic of those produced by broadcasting stations, on body weight and body mass, on the morphology of liver, spleen and brain, and on apoptosis rates and glycogen distribution in the liver. Two groups of rabbits were continuously exposed for 2 years to EMF of 650 MHz followed by 12 months (group 1) or 18 months (group 2) of post-exposure; a third group (group 3) was sham exposed. It was shown that the changes in apoptosis rates were conditional during the time of exposure, but not on a specific organ and that the whole body continuous exposure gave rise to modifications whose types and intensities were related to the time of post-exposure (12 or 18 months, respectively), the type of organ, and the individual animal. A number of effects were observed only in group 1, and not in group 2, which suggests some kind of adaptive response or of long-term recovery in the rabbits following continuous exposure to 650 MHz EMF.

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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 typeanimal

Effect directionmixed

Populationrabbits

Sample sizeNot supplied

ExposureRF · 650 MHz · continuous whole-body exposure for 2 years; followed by 12 months (group 1) or 18 months (group 2) post-exposure

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Rabbits continuously exposed whole-body to 650 MHz EMF for 2 years showed modifications in measured endpoints that varied by post-exposure duration (12 vs 18 months), organ type, and individual animal. Changes in apoptosis rates were described as conditional during the time of exposure but not specific to a particular organ. Some effects were observed only in the 12-month post-exposure group and not in the 18-month group, suggesting possible recovery/adaptation over time.

Outcomes measured

body weight
body mass
morphology of liver
morphology of spleen
morphology of brain
apoptosis rates
glycogen distribution in the liver

Limitations

Sample size not reported in the abstract.
Exposure intensity/dose metrics (e.g., SAR, field strength) not reported in the abstract.
Results are described qualitatively without quantitative effect sizes or statistical details in the abstract.
Animal study; generalizability to humans is limited.

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "RF",
    "source": "broadcasting station (characteristic fields)",
    "frequency_mhz": 650,
    "sar_wkg": null,
    "duration": "continuous whole-body exposure for 2 years; followed by 12 months (group 1) or 18 months (group 2) post-exposure"
  },
  "population": "rabbits",
  "sample_size": null,
  "outcomes": [
    "body weight",
    "body mass",
    "morphology of liver",
    "morphology of spleen",
    "morphology of brain",
    "apoptosis rates",
    "glycogen distribution in the liver"
  ],
  "main_findings": "Rabbits continuously exposed whole-body to 650 MHz EMF for 2 years showed modifications in measured endpoints that varied by post-exposure duration (12 vs 18 months), organ type, and individual animal. Changes in apoptosis rates were described as conditional during the time of exposure but not specific to a particular organ. Some effects were observed only in the 12-month post-exposure group and not in the 18-month group, suggesting possible recovery/adaptation over time.",
  "effect_direction": "mixed",
  "limitations": [
    "Sample size not reported in the abstract.",
    "Exposure intensity/dose metrics (e.g., SAR, field strength) not reported in the abstract.",
    "Results are described qualitatively without quantitative effect sizes or statistical details in the abstract.",
    "Animal study; generalizability to humans is limited."
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "rabbit",
    "650 MHz",
    "radiofrequency",
    "whole-body exposure",
    "continuous exposure",
    "broadcasting stations",
    "liver",
    "spleen",
    "brain",
    "apoptosis",
    "glycogen",
    "post-exposure"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.25,
      "reason": "Exposure described as characteristic of broadcasting stations (environmental/occupational-like RF source), though study is in animals."
    }
  ]
}

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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: 10.1007/s00411-005-0274-y
PubMed: 15812656

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