No effects of UMTS exposure on the function of rat outer hair cells.

Bioelectromagnetics · 2009 · No effect · Low evidence

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No effectLow evidencePaper 4970

No statistically significant differences were found in DPOAE audiological signals between UMTS-exposed and sham-exposed rats. The positive control group treated with kanamycin showed the expected ototoxic effect.

Study snapshot

PublicationBioelectromagnetics · 2009

Study typeanimal

Reported directionNo effect

Evidence ratingLow

Abstract

UMTS communication devices are becoming common in everyday use. This could raise public concern about their possible detrimental effects on human health. The aim of this study, in the framework of the EMF nEAR Project, was to evaluate possible influence of UMTS electromagnetic fields (EMF) exposure on cochlear outer hair cells' (OHCs) functionality in laboratory animals. Forty-eight male Sprague-Dawley rats were locally exposed (right ear) or sham-exposed to a controlled UMTS EMF, frequency of 1946 MHz, at SAR level of 10 W/kg, 2 h a day, 5 days a week, for 4 weeks. A group of 12 rats treated with kanamycin (KM) was also included as positive control. Rats were tested by recording Distortion Product Otaoacoustic Emissions (DPOAEs), a non-invasive test capable of assessing the status of the OHCs in the inner ear. DPOAEs were performed before, during (one or three times a week) and after (1-week) exposure to the EMF. The analysis of the data shows that no statistically significant differences were found between the audiological signals recorded from the different experimental groups. The ototoxic effect of KM has been confirmed.

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

PopulationMale Sprague-Dawley rats (right ear locally exposed)

Sample size48

ExposureRF · 1946 MHz · 10 W/kg · 2 h/day, 5 days/week, for 4 weeks

Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Outcomes measured

Cochlear outer hair cell (OHC) functionality
Distortion Product Otoacoustic Emissions (DPOAEs)

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "RF",
    "source": "UMTS communication devices",
    "frequency_mhz": 1946,
    "sar_wkg": 10,
    "duration": "2 h/day, 5 days/week, for 4 weeks"
  },
  "population": "Male Sprague-Dawley rats (right ear locally exposed)",
  "sample_size": 48,
  "outcomes": [
    "Cochlear outer hair cell (OHC) functionality",
    "Distortion Product Otoacoustic Emissions (DPOAEs)"
  ],
  "main_findings": "No statistically significant differences were found in DPOAE audiological signals between UMTS-exposed and sham-exposed rats. The positive control group treated with kanamycin showed the expected ototoxic effect.",
  "effect_direction": "no_effect",
  "limitations": [],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "UMTS",
    "RF EMF",
    "1946 MHz",
    "SAR 10 W/kg",
    "Sprague-Dawley rats",
    "outer hair cells",
    "DPOAE",
    "kanamycin positive control"
  ],
  "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: 10.1002/bem.20483
PubMed: 19242955

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