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Results for “Ear Protective Devices”

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PubMed1985

[Relation of the temporary threshold shift to the permanent threshold shift due to impulse noise, especially in the form of blast effects].

Observations on long serving soldiers who are frequently exposed to impulse noise trauma show that, in spite of ear protection, continued strain may gradually lead from a TTS to a PTS. On the other hand it is obvious that, despite increasing TTS and increasing duration of recovery, recovery is still possible even after several months. The experience that hearing damage caused by a single acoustic trauma tends to improve during the ensuing period or to remain constant, obviously applies also to hearing damage developing gradually due to multiple insults caused by impulse noises (blast noises). Due to today's compulsory wearing of ear protectors, the percentage of endangered persons has fallen to about 5%. But even these subjects have a chance to recover after several months, if the subject's exposure ceases. This is of importance with regard to a survey particularly in the evaluation of occupational disability.

Adult↗
PubMed1985

[Is there a risk of noise-induced hearing loss in automobile drivers and in automobile sport racing?].

Professional racing drivers are exposed to extreme noise pollution by their high-capacity cars. For the purpose of evaluating the emissive noise of racing-cars, noise-level measurements on race-courses were undertaken. As a result noise-levels up to 130 dB (A) for the outer noises and 125 dB (A) for the inner region of the car were measured. Moreover, eighteen professional racing drivers as well as eleven employees, working in the pit, underwent audiometric investigations. Only one of the racing drivers showed noise deafness. This result can be explained by the short periods of exposure to the noise, which is 150-180 hours every year, and the regular wearing of ear-plugs. The employees working in the pits, however, showed distinct hearing impairments, explained above all, by their activities at the motor-test blocks. Incidentally this paper also deals with the noise sources of vehicles and the origin of noise deafness. There is no risk of noise deafness for this group of persons.

Audiometry, Pure-Tone↗
PubMed1979

Industrial hearing conservation.

Hearing conservation programs, when appropriate in industry, are now a necessity. Even though one may not wish to adopt an altruistic attitude toward the conservation of hearing, one must, like it or not, initiate a hearing conservation program because of both federal and state regulations. Since industrial noise exposure produced more hearing loss in more people than all other causes of hearing loss combined, it is incumbent on all industries with noise makers to do something about protecting human hearing. The tragedy is that nearly all industrial hearing loss can be prevented with proper hearing conservation measures. The cost of hearing conservation is far less than the cost of hearing loss in terms of human suffering and dollars in the compensation courts. Proper education of both managment and labor can result in successful hearing conservation programs. The method of choice is reduction of the noise at the source, but in many cases this is infeasible both technically and economically and therefore protection at the ear must be used. Experience has shown that with proper supervision ear protection programs can prevent the majority of instances of hearing loss in the majority of individuals exposed.

Acoustics↗
PubMed1979

[Ear protective plugs].

The authors present results of studies of application of polyurethane foam to produce individual sound-absorbing ear plugs. In addition to physico-mechanical properties of the foam, the authors present its optimum prescribed composition, ensuring appropriate attenuation qualities, flexibility, softness and long -- lasting strain relaxation -- i.e. the conditions resulting in excellent filling of external auditory meatus, masking effect and utilization comfort. The efficiency of attenuation of sounds by the plugs, tested audiometrically by the method of auditory threshold shift in otologically healthy subjects ranges from 12.25 dB (250 Hz) to 29.75 dB (4000 Hz). No significant inflammatory reactions in external ear skin were found after 8 hrs of continuous wearing of ranges under the work conditions typical for the textile industry. The results demonstrate that the polyurethane foam, developed by the authors, are valuable ear protectors, of advantageous functional qualities.

Ear Protective Devices↗