Effect of whole-body exposure to high-frequency electromagnetic field on the brain electrogeny in neurodefective and healthy mice.

Prague medical report · 2005 · Mixed · Low evidence

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MixedLow evidencePaper 5176

Study snapshot

PublicationPrague medical report · 2005

Study typeanimal

Reported directionMixed

Evidence ratingLow

Abstract

A direct registration of brain cortical and hippocampal activity during a high-frequency electromagnetic field (HF EMF) exposure was performed. All experimental procedures were done under urethane anaesthesia (20%, 2 g/kg i.p.) in Lurcher mutant mice, wild type (healthy littermates) were used as controls. Experimental animals were exposed to the HF EMF with frequency corresponding to cellular phones. Our method is based on the use of gel electrodes (silicon tubes or glass microcapillaries filled with agar) where the connection with classical electrodes is located out of HF EMF space. ECoG evaluation showed a distinct shift to lower frequency components but clear effect has been observed only in wild type (healthy) mice whereas in Lurcher mutant mice only gentle differences between frequency spectra were found. Measurement of hippocampal rhythmicity showed gentle changes with increase of higher frequencies (i.e. opposite effect than in cortex) and changes in theta oscillations registered from a dentate gyrus and CA1 area in both types of animals (healthy and mutant). These findings support the idea about possible influencing the central nervous system by HF EMF exposure and support also some recent results about possible health risks resulting from cellular phones use.

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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

PopulationLurcher mutant mice (neurodefective) and wild type (healthy littermates) under urethane anaesthesia

Sample sizeNot supplied

ExposureRF

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

During HF EMF exposure (frequency corresponding to cellular phones), cortical ECoG showed a shift to lower frequency components, with a clear effect reported only in wild type mice; Lurcher mutant mice showed only gentle differences. Hippocampal rhythmicity showed gentle changes with an increase of higher frequencies and changes in theta oscillations in both wild type and mutant animals.

Outcomes measured

Cortical electrocorticography (ECoG) frequency spectrum changes during exposure
Hippocampal rhythmicity changes (dentate gyrus and CA1), including theta oscillations

Limitations

No exposure parameters reported (e.g., exact frequency, SAR, field strength, duration).
Sample size not stated in the abstract.
Animals were under urethane anaesthesia, which may affect brain activity measures.

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "RF",
    "source": "mobile phone",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Lurcher mutant mice (neurodefective) and wild type (healthy littermates) under urethane anaesthesia",
  "sample_size": null,
  "outcomes": [
    "Cortical electrocorticography (ECoG) frequency spectrum changes during exposure",
    "Hippocampal rhythmicity changes (dentate gyrus and CA1), including theta oscillations"
  ],
  "main_findings": "During HF EMF exposure (frequency corresponding to cellular phones), cortical ECoG showed a shift to lower frequency components, with a clear effect reported only in wild type mice; Lurcher mutant mice showed only gentle differences. Hippocampal rhythmicity showed gentle changes with an increase of higher frequencies and changes in theta oscillations in both wild type and mutant animals.",
  "effect_direction": "mixed",
  "limitations": [
    "No exposure parameters reported (e.g., exact frequency, SAR, field strength, duration).",
    "Sample size not stated in the abstract.",
    "Animals were under urethane anaesthesia, which may affect brain activity measures."
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "high-frequency electromagnetic field",
    "HF EMF",
    "radiofrequency",
    "cellular phone",
    "mouse",
    "Lurcher mutant",
    "electrocorticography",
    "hippocampus",
    "theta oscillations",
    "cortex"
  ],
  "suggested_hubs": [
    {
      "slug": "animal-studies",
      "weight": 0.9,
      "reason": "Experimental HF EMF exposure with direct brain activity recordings in mice."
    }
  ]
}

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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: 16007915

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