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[Effect of ultra-high frequency electromagnetic energy on the rheologic properties of the blood].

Gigiena truda i professional'nye zabolevaniia · 1990 · Harm · Low evidence

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HarmLow evidencePaper 6261

In 150 rats exposed to microwave radiation (8 mm; 80 mVt/cm2) for 5 hours/day over 3 days, elevated blood viscosity (hyperviscosity) was observed using rotation and ultrasound viscometers at low and high shear frequencies. Hematocrit did not change; the visco…

Study snapshot

PublicationGigiena truda i professional'nye zabolevaniia · 1990
Study typeanimal
Reported directionHarm
Evidence ratingLow

Abstract

The effect of microwave radiation with the range of 8 mm (80 mVt/cm2) on rheologic blood properties was studied on 150 random-bred rats. The animals were irradiated for 5 hours a day during 3 days. It was established that the animals developed the syndrome of elevated blood viscosity. Blood hyperviscosity was detected by rotation and ultrasound viscosimeters both under low and high shift frequencies. Hematocritic index underwent no changes in exposed rats. The study revealed that microwave-induced elevation of blood viscosity was primarily caused not by hemoconcentration but by a significant decrease in erythrocyte deformability and increase in stability of the erythrocytic aggregate. Membrane damage was assumed to be one of the causes of the changes in erythrocyte rheologic properties. That assumption was confirmed by the data on the decrease of erythrocyte mechanical resistance following the exposure to microwave radiation.

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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 directionharm
Population150 random-bred rats
Sample size150
Exposuremicrowave · 5 hours/day for 3 days
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

In 150 rats exposed to microwave radiation (8 mm; 80 mVt/cm2) for 5 hours/day over 3 days, elevated blood viscosity (hyperviscosity) was observed using rotation and ultrasound viscometers at low and high shear frequencies. Hematocrit did not change; the viscosity increase was attributed mainly to decreased erythrocyte deformability and increased stability of erythrocyte aggregates, with decreased erythrocyte mechanical resistance reported after exposure.

Outcomes measured

  • blood viscosity
  • hematocrit index
  • erythrocyte deformability
  • erythrocyte aggregation stability
  • erythrocyte mechanical resistance
  • blood rheologic properties

Limitations

  • Frequency in Hz/MHz/GHz not reported (only wavelength given).
  • Exposure metric reported as 80 mVt/cm2; SAR not provided.
  • Mechanistic interpretation (membrane damage) described as assumed/attributed in the abstract.
View raw extracted JSON
{
  "study_type": "animal",
  "exposure": {
    "band": "microwave",
    "source": null,
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "5 hours/day for 3 days"
  },
  "population": "150 random-bred rats",
  "sample_size": 150,
  "outcomes": [
    "blood viscosity",
    "hematocrit index",
    "erythrocyte deformability",
    "erythrocyte aggregation stability",
    "erythrocyte mechanical resistance",
    "blood rheologic properties"
  ],
  "main_findings": "In 150 rats exposed to microwave radiation (8 mm; 80 mVt/cm2) for 5 hours/day over 3 days, elevated blood viscosity (hyperviscosity) was observed using rotation and ultrasound viscometers at low and high shear frequencies. Hematocrit did not change; the viscosity increase was attributed mainly to decreased erythrocyte deformability and increased stability of erythrocyte aggregates, with decreased erythrocyte mechanical resistance reported after exposure.",
  "effect_direction": "harm",
  "limitations": [
    "Frequency in Hz/MHz/GHz not reported (only wavelength given).",
    "Exposure metric reported as 80 mVt/cm2; SAR not provided.",
    "Mechanistic interpretation (membrane damage) described as assumed/attributed in the abstract."
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave radiation",
    "8 mm",
    "rats",
    "blood viscosity",
    "hyperviscosity",
    "erythrocyte deformability",
    "erythrocyte aggregation",
    "hematocrit",
    "mechanical resistance",
    "rheology"
  ],
  "suggested_hubs": []
}
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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: 2328920

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