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

PAPER pubmed Gigiena truda i professional'nye zabolevaniia 1990 Animal study Effect: harm Evidence: Low

Read original paper → PMID: 2328920 Evidence Lab

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.

AI evidence extraction

At a glance

Study type

Animal study

Effect direction

harm

Population

150 random-bred rats

Sample size

150

Exposure

microwave · 5 hours/day for 3 days

Evidence strength

Low

Confidence: 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": 0.7800000000000000266453525910037569701671600341796875,
    "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/metadata and may be incomplete or incorrect. This content is for informational purposes only and is not medical advice.

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