An Interim LAeq8 Criterion for Impulse Noise Injury

Zagadou, Brissi; Chan, Philemon; Ho, Kah Leng

doi:10.7205/milmed-d-15-00185

Cited by 9 publications

(3 citation statements)

References 5 publications

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“…20,21 Waveform parameterbased damage risk criteria are typically quantified in terms of the peak amplitude, pressure wave, and envelope duration of the impulse. 22 Other damage risk criteria reference the energy-based, integrated A-weighted 8-hour equivalent level, [23][24][25] apply criteria derived from theoretical physiologically based ear models such as the Auditory Hazard Assessment Algorithm for Humans, 26 or apply fatigue modeling to predict cochlear structure damage. 27 These more complex approaches are typically utilized for research or military purposes and, once validated fully, could better inform health care providers and the public.…”

Section: Auditory Risk From Firearm Impulse Noisementioning

confidence: 99%

Prevention of Noise-Induced Hearing Loss from Recreational Firearms

et al. 2017

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In the United States and other parts of the world, recreational firearm shooting is a popular sport that puts the hearing of the shooter at risk. Peak sound pressure levels (SPLs) from firearms range from ∼140 to 175 dB. The majority of recreational firearms (excluding small-caliber 0.17 and 0.22 rifles and air rifles) generate between 150 and 165 dB peak SPLs. High-intensity impulse sounds will permanently damage delicate cochlear structures, and thus individuals who shoot firearms are at a higher risk of bilateral, high-frequency, noise-induced hearing loss (NIHL) than peer groups who do not shoot. In this article, we describe several factors that influence the risk of NIHL including the use of a muzzle brake, the number of shots fired, the distance between shooters, the shooting environment, the choice of ammunition, the use of a suppressor, and hearing protection fit and use. Prevention strategies that address these factors and recommendations for specialized hearing protectors designed for shooting sports are offered. Partnerships are needed between the hearing health community, shooting sport groups, and wildlife conservation organizations to develop and disseminate accurate information and promote organizational resources that support hearing loss prevention efforts.

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Section: Auditory Risk From Firearm Impulse Noisementioning

confidence: 99%

Prevention of Noise-Induced Hearing Loss from Recreational Firearms

et al. 2017

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“…There are also data according to which the A-weighted SPL, which guarantees no impact of noise on hearing even after long-term exposure, is 80 dB [20]. At the same time, L EX,8h at 89 dB can be supplemented since one of the papers concluded that, in the case of impulse noise [21], this was considered a safe value to protect 95% of the population in 95% of cases.…”

Section: Methodsmentioning

confidence: 99%

Selection of Level-Dependent Hearing Protectors for Use in An Indoor Shooting Range

Młyński

Kozłowski

2019

IJERPH

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The high sound pressure level generated by impulse noise produced in an indoor shooting range makes it necessary to protect the hearing of the people it affects. Due to the need for verbal communication during training at a shooting range, level-dependent hearing protectors are useful. The objective of this study was to answer the question of whether it is possible to properly protect the hearing of a shooting instructor using level-dependent hearing protectors. The noise parameters were measured in the places where the instructor was present at the shooting range. The division of a specific group of trained shooters into subgroups consisting of three or six simultaneously shooting individuals did not significantly affect the exposure of the shooting instructor to the noise. An assessment of noise reduction was carried out for eight models of earmuffs and two variants of earplugs, using computational methods for the selection of hearing protectors. Among the noise parameters, both the A-weighted equivalent sound pressure level and the C-weighted peak sound pressure level were taken into account. Depending on the assessment criterion adopted, a sufficient reduction in impulse noise was provided by either four or six out of the 10 hearing protectors included in the study.

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“…In spite of the use of hearing protectors, exposure to impulse noise may be dangerous to hearing [9]. Therefore, a better and safer solution is the use of devices which reproduce human characteristics, which eliminates the need for human participation in the tests [10,11]. These devices are called acoustic test fixtures.…”

Section: Introductionmentioning

confidence: 99%

Noise reduction at the shooting range by means of level-dependent hearing protectors

Młyński

Kozłowski

2019

Med Pr

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Background: The aim of the tests was to establish the possibilities of reducing impulse noise by using level-dependent hearing protectors at a shooting range. The tests included 9 models of level-dependent earmuffs and 2 models of level-dependent earplugs. They were conducted in the presence of impulse noise generated by 7 types of firearms (pistols, a submachine gun, rifles, a shotgun). Material and Methods: The tests were conducted at an outdoor shooting range, using an acoustic test fixture that meets the requirements of the ANSI/ASA S12.42-2010 standard. Noise parameters were established for the noise reaching the microphones installed in the ear simulators of the acoustic test fixture: uncovered and protected by the tested hearing protectors. Results: All 11 tested level-dependent hearing protectors allow to satisfactorily (below the exposure limit values) reduce the C-weighted peak sound pressure level and A-weighted maximum sound pressure level parameters of noise produced during shots from the 7 types of firearms included in the study. Moreover, in the most unfavorable case, the permissible number of impulses due to the value of the A-weighted noise exposure level normalized to an 8-h working day parameter exceeds 5000 per day. Conclusions: Level-dependent hearing protectors constitute the appropriate means to protect the hearing of people at a shooting range, while maintaining the functionality of these protection devices to transmit speech signals.

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An Interim LAeq8 Criterion for Impulse Noise Injury

Abstract: Therefore, considering the limitation of the walk-up dataset, it is conservative to adopt the 85 dBA threshold for general application.

Cited by 9 publications

References 5 publications

Prevention of Noise-Induced Hearing Loss from Recreational Firearms

Prevention of Noise-Induced Hearing Loss from Recreational Firearms

Selection of Level-Dependent Hearing Protectors for Use in An Indoor Shooting Range

Noise reduction at the shooting range by means of level-dependent hearing protectors

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