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Related Concept Videos

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When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
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In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
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Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...
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Related Experiment Video

Updated: Apr 11, 2026

Modified Experimental Conditions for Noise-Induced Hearing Loss in Mice and Assessment of Hearing Function and Outer Hair Cell Damage
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Hearing loss in shipyard employees.

Evangelos C Alexopoulos1, Thomaella Tsouvaltzidou2

  • 1Department of Public Health, Medical School, University of Patras, Patras, Greece ; School of Social Sciences, Hellenic Open University, Patras, Greece.

Indian Journal of Occupational and Environmental Medicine
|May 30, 2015
PubMed
Summary

Noise-induced hearing loss (NIHL) affects 27.1% of shipyard workers in Greece. Factors like age, job title, and education correlate with hearing impairment, highlighting the need for hearing conservation programs.

Keywords:
Audiogramsblue-collar workersheavy industrynoise-induced hearing lossshipyard

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Area of Science:

  • Occupational Health
  • Audiology
  • Public Health

Background:

  • Noise-induced hearing loss (NIHL) is a significant occupational illness, particularly prevalent in heavy industries.
  • Shipyard workers face a high risk of developing NIHL due to their work environment.

Purpose of the Study:

  • To determine the prevalence of NIHL among shipyard employees in Greece.
  • To identify job-related and individual factors associated with NIHL in this population.

Main Methods:

  • A study involving 757 white- and blue-collar employees at a Greek shipyard company.
  • Data collection through questionnaires and audiograms (2006-2009).
  • Hearing loss calculated using a modified American Academy of Otolaryngology equation; statistical analysis via SPSS v. 17.

Main Results:

  • A significant prevalence of hearing handicap (27.1%) was observed among the employees.
  • Hearing loss showed correlations with age, prior ear conditions, hyperlipidemia, job title, and education level.
  • Subjective hearing ability and symptoms were strong indicators of hearing pathology.

Conclusions:

  • The study underscores the substantial burden of hearing disease within the shipyard industry.
  • Emphasizes the critical need for ongoing surveillance, preventive strategies, and hearing conservation initiatives.