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Effects of extremely low frequency electromagnetic fields on transient evoked otoacoustic emissions in rabbits.

International journal of pediatric otorhinolaryngology · 2009 · No effect · Low evidence

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No effectLow evidencePaper 4976

Rabbits exposed to 5.068 kV/m or 10.182 kV/m electric fields for 14 days showed no significant differences in TEOAE amplitudes at day 6 or day 14 compared with baseline, except for a significant transient decrease at 1.5 kHz in right ear recordings in the 5.0…

Study snapshot

PublicationInternational journal of pediatric otorhinolaryngology · 2009
Study typeanimal
Reported directionNo effect
Evidence ratingLow

Abstract

OBJECTIVE: Humans are continuously exposed to an extremely low frequency (ELF) of electromagnetic fields (EMF), transmitted from the common sources like power stations, electric transmission lines, communication and radio-television signal transmission units. The present study aimed to assess the effects of 5.068 kV/m and 10.182 kV/m electric fields, which refer to the lower and upper intensity limits beyond which hazardous effects can be observed, on the auditory functions of rabbits via transient evoked otoacoustic emission (TEOAE) recordings. METHODS: The study was performed on 20 healthy adult female New Zealand White rabbits randomly divided into two groups and applied either 5.068 kV/m (Group 1) or 10.182 kV/m (Group 2) of electric field for 3h/day for 14 days. TEOAE responses were recorded on day 0 before the exposure (0-BE) and on the 6th (6th-AE) and 14th (14th-AE) days after the exposure (AE). Emission amplitudes at 1.0-4.0 kHz were analyzed. RESULTS: In Groups 1 and 2, the amplitudes separately recorded on the 6th-AE day were not different from the amplitudes recorded on day 0-BE. On the 6th-AE day, the only significant difference was detected in the right ear recordings of Group 1 at the frequency of 1.5 kHz (p=0.007). In Group 1, at 1.5 kHz, the median 6th day AE value (3.8 dB SPL) for the right ear was significantly lower than the median BE value. No significant difference in terms of amplitudes was detected in the comparison of 14th day AE with day 0-BE recordings. In the comparison of the groups for the recordings obtained at all the time points, no statistically significant differences were found. CONCLUSION: It was concluded that the TEOAE decrease at 1.5 kHz of the right ears of Group 1 on the 6th day AE was transient; and on the 14th day AE, no significant decrease was determined in the TEOAEs of both groups. Our results showed that the ELF EMFs have no significant effects on the hearing sensation of rabbits, the cochlear functions of whose were evaluated using TEOAE recordings.

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
Population20 healthy adult female New Zealand White rabbits
Sample size20
ExposureELF · 3 h/day for 14 days
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Rabbits exposed to 5.068 kV/m or 10.182 kV/m electric fields for 14 days showed no significant differences in TEOAE amplitudes at day 6 or day 14 compared with baseline, except for a significant transient decrease at 1.5 kHz in right ear recordings in the 5.068 kV/m group on day 6. No significant differences were found between exposure groups at any time point.

Outcomes measured

  • Transient evoked otoacoustic emissions (TEOAE) amplitudes (1.0–4.0 kHz)
  • Auditory/cochlear function assessed via TEOAE

Limitations

  • Frequency of the ELF field not reported in the abstract
  • Small sample size (n=20)
  • Only adult female rabbits studied
  • Outcome limited to TEOAE measures over a short follow-up (up to 14 days)
View raw extracted JSON
{
  "study_type": "animal",
  "exposure": {
    "band": "ELF",
    "source": null,
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "3 h/day for 14 days"
  },
  "population": "20 healthy adult female New Zealand White rabbits",
  "sample_size": 20,
  "outcomes": [
    "Transient evoked otoacoustic emissions (TEOAE) amplitudes (1.0–4.0 kHz)",
    "Auditory/cochlear function assessed via TEOAE"
  ],
  "main_findings": "Rabbits exposed to 5.068 kV/m or 10.182 kV/m electric fields for 14 days showed no significant differences in TEOAE amplitudes at day 6 or day 14 compared with baseline, except for a significant transient decrease at 1.5 kHz in right ear recordings in the 5.068 kV/m group on day 6. No significant differences were found between exposure groups at any time point.",
  "effect_direction": "no_effect",
  "limitations": [
    "Frequency of the ELF field not reported in the abstract",
    "Small sample size (n=20)",
    "Only adult female rabbits studied",
    "Outcome limited to TEOAE measures over a short follow-up (up to 14 days)"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "extremely low frequency",
    "ELF",
    "electromagnetic fields",
    "electric field",
    "kV/m",
    "rabbits",
    "New Zealand White",
    "transient evoked otoacoustic emissions",
    "TEOAE",
    "hearing",
    "cochlear function"
  ],
  "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: 10.1016/j.ijporl.2008.11.011
PubMed: 19128843

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