Occupational safety: effects of workplace radiofrequencies on hearing function.

Archives of medical research · 2004 · Mixed · Low evidence

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MixedLow evidencePaper 6404

BERA interpeak latencies (I-III, I-V, III-V) did not differ significantly between RF-exposed workers and controls (p>0.05). In audiometry, hearing thresholds were higher in the RF-exposed group than controls at 4000 Hz and 8000 Hz for bone and air conduction …

Study snapshot

PublicationArchives of medical research · 2004

Study typecase_control

Reported directionMixed

Evidence ratingLow

Abstract

BACKGROUND: The effects of radio frequency (RF) and microwave radiation on humans have been the subject of continuous investigation. Clinical investigations related to occupational RF/microwave exposure have been reported by investigators (1). Since one of the major groups occupationally exposed to RF and microwave radiation includes those working in radio broadcasting and TV transmitter stations, this study investigates whether RF affects auditory systems of people exposed to RF. METHODS: The study is carried out with people working in radio broadcasting stations and living in employee residential houses close to the broadcasting stations. All subjects in the control group were similar in age, work regime, socioeconomic status, and lack of experience in working with RF sources. Brainstem Evoked Response Audiometer (BERA) and Pure Tone Audiometry (PTA) were used to measure the effects of RF under investigation on hearing functions of the subjects. In BERA measurements, I-III, III-V and I-V interpeak latencies were evaluated. In pure tone audiometric measurements, 250 Hz, 500 Hz, 1000 Hz, 2000 Hz, 4000 Hz and 8000 Hz frequencies of hearing threshold were measured in subjects of experimental and control groups. Interpeak latencies and bone conduction hearing thresholds of subjects in the experimental group were compared with those of the control group. RESULTS: BERA results showed that I-III, I-V and III-V interpeak latencies of people occupationally exposed to RF were not higher than subjects in control groups (p>0.05). Results of BERA indicated no statistically significant differences between exposure and control subjects. In audiometric evaluation, hearing threshold of people occupationally exposed to RF were found higher than the control group subjects for frequencies of 4000 Hz and 8000 Hz in terms of bone and air conduction of right and left ear (p < 0.01). CONCLUSIONS: The results of traditional audiometer indicated that RF promotes sensorineural hearing loss and affects cochlea parts related to 4000 Hz and 8000 Hz. These findings may have immediate implications and considerations for workplace safety in order to provide an occupationally safe environment to employees working in such settings.

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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 typecase_control

Effect directionmixed

PopulationPeople working in radio broadcasting stations and living in employee residential houses close to the broadcasting stations; compared with controls without experience working with RF sources

Sample sizeNot supplied

ExposureRF/microwave

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Outcomes measured

Brainstem Evoked Response Audiometer (BERA) interpeak latencies (I-III, III-V, I-V)
Pure Tone Audiometry (PTA) hearing thresholds at 250, 500, 1000, 2000, 4000, 8000 Hz (bone and air conduction; right and left ear)
Sensorineural hearing loss (as interpreted by authors)

Limitations

Sample size not reported in abstract
RF exposure characterization (frequency, intensity, duration) not reported in abstract
Potential confounding factors (e.g., noise exposure) not described in abstract
Study design details (selection, matching, blinding) not fully described in abstract

View raw extracted JSON

{
  "study_type": "case_control",
  "exposure": {
    "band": "RF/microwave",
    "source": "occupational (radio broadcasting/TV transmitter stations; residential houses close to stations)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "People working in radio broadcasting stations and living in employee residential houses close to the broadcasting stations; compared with controls without experience working with RF sources",
  "sample_size": null,
  "outcomes": [
    "Brainstem Evoked Response Audiometer (BERA) interpeak latencies (I-III, III-V, I-V)",
    "Pure Tone Audiometry (PTA) hearing thresholds at 250, 500, 1000, 2000, 4000, 8000 Hz (bone and air conduction; right and left ear)",
    "Sensorineural hearing loss (as interpreted by authors)"
  ],
  "main_findings": "BERA interpeak latencies (I-III, I-V, III-V) did not differ significantly between RF-exposed workers and controls (p>0.05). In audiometry, hearing thresholds were higher in the RF-exposed group than controls at 4000 Hz and 8000 Hz for bone and air conduction in both ears (p<0.01).",
  "effect_direction": "mixed",
  "limitations": [
    "Sample size not reported in abstract",
    "RF exposure characterization (frequency, intensity, duration) not reported in abstract",
    "Potential confounding factors (e.g., noise exposure) not described in abstract",
    "Study design details (selection, matching, blinding) not fully described in abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "radiofrequency",
    "microwave",
    "occupational exposure",
    "radio broadcasting stations",
    "TV transmitter stations",
    "hearing function",
    "audiometry",
    "BERA",
    "sensorineural hearing loss",
    "workplace safety"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.9,
      "reason": "Study evaluates hearing outcomes in workers occupationally exposed to RF/microwave at broadcasting/transmitter stations."
    }
  ]
}

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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.arcmed.2004.11.011
PubMed: 15631877

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