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The criterion most commonly used is the standard threshold shift (STS), defined by a change of 10 dB or greater averaged at 2000, 3000, and 4000 Hz. [18] Age correction factors can be applied to the change in order to compensate for hearing loss that is age-related rather than work-related.
Hearing threshold shifts were observed in 86% of the officials (25/29). [ 76 ] In a study of noise levels at 10 intercollegiate basketball games showed noise levels in 6 of the 10 basketball games to exceed the national workplace noise exposure standards, with participants showing temporary threshold levels at one of the games.
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.
Auditory fatigue is defined as a temporary loss of hearing after exposure to sound. This results in a temporary shift of the auditory threshold known as a temporary threshold shift (TTS).
NIHL can be either permanent or temporary, called a threshold shift. Unsafe levels of noise can be as little as 70 dB (about twice as loud as normal conversation) if there is prolonged (24-hour) or continuous exposure. 125 dB (a loud rock concert is ~120 dB) is the pain level; sounds above this level cause instant and permanent ear damage.
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Threshold Limit Values (TLVs), often determined by the American Conference of Governmental Industrial Hygienists (ACGHI), is a key component in determining the PEL. [11] [10] Other things that contribute to determining the PEL are toxicity and particle size. [10] PELs for chemicals are measured in mg/M 3 (milligrams per cubic meter). [2]
HPD is required when exposed to average noise intensity of 90 dBA or greater over an 8-hour shift. [4] MSHA requirements are similar to OSHA. OSHA and MSHA require the use of hearing protection for workers who have not had a baseline hearing test or have had a shift in hearing thresholds, called a standard threshold shift.