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Unlike acoustic trauma, this form of NIHL does not occur from a single exposure to a high-intensity sound pressure level. Gradually developing NIHL can be caused by multiple exposures to excessive noise in the workplace or any source of repetitive, frequent exposures to sounds of excessive volume, such as home and vehicle stereos, concerts ...
The most common culprits of NIHL are anything that produces loud noise at a high decibel level for an extended period. As mentioned, this includes concerts, construction work, and loud machinery ...
However, if the noise is loud enough or happens frequently enough, the damage can be permanent. This is called noise-induced hearing loss (NIHL), and it happens when the tiny hair cells in your ...
The passive system works to stimulate the inner hair cells directly and works at levels above 40 dB. [4] At stimulation levels that prevent the excitation of the passive system, prolonged noise exposure results in a decrease in the loudness heard over time, even when the actual intensity of the noise has not changed. [2]
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.
The U.S. Environmental Protection Agency has identified the level of 70 dB(A) (40% louder to twice as loud as normal conversation; typical level of TV, radio, stereo; city street noise) for 24‑hour exposure as the level necessary to protect the public from hearing loss and other disruptive effects from noise, such as sleep disturbance, stress ...
Noise-induced hearing loss (NIHL) is an increasingly common disorder often caused by work-related activities. Construction, manufacturing, and mining are some of the most susceptible occupations to NIHL, since many workers in these fields are exposed to high levels of noise on a daily basis. [ 5 ]
Noise-induced hearing loss (NIHL) typically occurs when the auditory system experiences an elevation of hearing thresholds due to exposure to high-level noise, a phenomenon known as a temporary threshold shift (TTS), and does not return to normal threshold levels. [6] The damage to the auditory system can vary depending on the type of noise ...