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Another determination that is made includes whether an STS is "recordable" under OSHA standards, meaning the workplace must report the change to OSHA. In order to be recordable the employee's new thresholds at 2000, 3000, and 4000 Hz must exceed an average of 25 dB HL. [18] MSHA standard differs slightly in terms of calculation and terminology.
The first test is called a baseline. It provides a standard to compare future audiometric tests. If a significant change in hearing capabilities occurs (called a standard threshold shift) greater steps must be taken to ensure the employee is protected from high levels of noise exposure. The third aspect is the implementation of hearing protection.
The discomfort threshold is the loudness level from which a sound starts to be felt as too loud and thus painful by an individual. Industry workers tend to have a higher discomfort threshold (i.e. the sounds must be louder to feel painful than for non-industry workers), but the sound is just as harmful to their ears. [33]
Instead, it is located much further down and the differences associated between them explain the shift in threshold. [2] The TTS that is experienced is the exhaustion of the active system located at the locus of the traveling wave driven by the cochlear amplifier described below. [ 4 ]
Asbestos, a known human carcinogen, can be injurious to consumers if found in talc-containing cosmetic products as there is no established "safe level" threshold for exposure to the substance. If ...
Temporary hearing loss after loud noise exposure. If such exposure is long enough, this temporary threshold shift may become permanent. [13] Occupational noise, if experienced repeatedly, at high intensity, for an extended period of time, can cause noise-induced hearing loss (NIHL) [14] which is then classified as occupational hearing loss.
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Acoustic trauma may result in sensorineural HL (SNHL) that is either temporary (temporary threshold shift, TTS) or permanent (permanent threshold shift, PTS). A TTS will resolve with time, while the time frame for hearing recovery is unique in every case, any SNHL that persists beyond eight weeks after injury is most likely permanent and should ...