Effects of subchronic exposure to a 1439 MHz electromagnetic field on the microcirculatory parameters in rat brain.

In vivo (Athens, Greece) · 2007 · No effect · Low evidence

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No effectLow evidencePaper 5051

After 4 weeks of head exposure to 1439 MHz RF-EMF at 2.4 W/kg brain-averaged SAR, no dye extravasation from pial venules was observed, no significant changes in endothelial-adhering leukocytes were found, and plasma velocity remained within the physiological …

Study snapshot

PublicationIn vivo (Athens, Greece) · 2007

Study typeanimal

Reported directionNo effect

Evidence ratingLow

Abstract

UNLABELLED: THE AIM of this study was to investigate whether repeated exposure to radio frequency electromagnetic field (RF-EMF) of 1439 MHz affects the cerebral microcirculation, including blood-brain barrier function, in a rat brain. MATERIALS AND METHODS: The head of the rat was exposed for four weeks (60 min/day, 5 days/week) to RF-EMF at 2.4 W/kg of brain averaged specific absorption rate (BASAR). Three microcirculatory parameters: blood-brain barrier permeability, leukocyte behavior and plasma velocity were measured before and after RF-EMF exposure using a closed cranial window method. RESULTS: No extravasation of intravenously injected dyes from pial venules was found at any BASAR level. No significant changes in the number of endothelial-adhering leukocytes after exposure were found. The plasma velocity remained constant within the physiological range through each exposure. CONCLUSION: These findings suggest that there were no effects on the cerebral microcirculation under the given RF-EMF exposure conditions.

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 typeanimal

Effect directionno_effect

PopulationRats

Sample sizeNot supplied

ExposureRF · 1439 MHz · 2.4 W/kg · 4 weeks (60 min/day, 5 days/week)

Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Outcomes measured

Cerebral microcirculation parameters
Blood-brain barrier permeability (dye extravasation)
Leukocyte behavior (endothelial-adhering leukocytes)
Plasma velocity

Limitations

Sample size not reported in abstract
Only one exposure frequency and SAR level described in abstract
Outcomes limited to selected microcirculatory parameters measured with a closed cranial window method

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "RF",
    "source": null,
    "frequency_mhz": 1439,
    "sar_wkg": 2.4,
    "duration": "4 weeks (60 min/day, 5 days/week)"
  },
  "population": "Rats",
  "sample_size": null,
  "outcomes": [
    "Cerebral microcirculation parameters",
    "Blood-brain barrier permeability (dye extravasation)",
    "Leukocyte behavior (endothelial-adhering leukocytes)",
    "Plasma velocity"
  ],
  "main_findings": "After 4 weeks of head exposure to 1439 MHz RF-EMF at 2.4 W/kg brain-averaged SAR, no dye extravasation from pial venules was observed, no significant changes in endothelial-adhering leukocytes were found, and plasma velocity remained within the physiological range.",
  "effect_direction": "no_effect",
  "limitations": [
    "Sample size not reported in abstract",
    "Only one exposure frequency and SAR level described in abstract",
    "Outcomes limited to selected microcirculatory parameters measured with a closed cranial window method"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "1439 MHz",
    "RF-EMF",
    "radiofrequency",
    "rat brain",
    "cerebral microcirculation",
    "blood-brain barrier",
    "leukocytes",
    "plasma velocity",
    "specific absorption rate",
    "closed cranial window"
  ],
  "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: 17708347

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