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Utilisation des prothèses auditives en milieu de travail bruyant
Peu d'études scientifiques ont porté sur la problématique du port des prothèses auditives en milieu de travail bruyant. Ainsi, on connaît très peu l'ampleur de cette pratique et les risques et bénéfices qui y sont associés. Cette étude impliquant une quête d'information auprès des professionnels de la santé, des travailleurs et des manufacturiers ainsi qu'une revue de la littérature scientifique, vise donc à : 1) explorer la fréquence du port de prothèses auditives...
Développement d’outils et de méthodes pour mieux évaluer et améliorer la protection auditive individuelle des travailleurs
Lorsque l'élimination à la source ne peut être envisagée, la protection individuelle demeure la solution la plus utilisée pour protéger les travailleurs exposés à des niveaux de bruit importants en raison de sa facilité et de sa rapidité d'implantation, ainsi que de son faible coût économique. Le port des protecteurs auditifs est néanmoins associé à plusieurs problématiques : (i) ils peuvent être un cofacteur de risque pour les accidents du travail, (ii) leur performance réelle...
Efficacité des protecteurs auditifs
Les protecteurs individuels contre le bruit (PICB) peuvent être utilisés en complément des moyens de prévention collective contre les nuisances sonores. L'atténuation des bruits apportée par ces équipements est mesurée en laboratoire suivant certaines normes. Des méthodes commerciales existent afin d'évaluer l'atténuation fournie par les PICB sur le lieu de travail. L'INRS a étudié la précision de 4 systèmes commerciaux par rapport aux méthodes de référence...
Comment mettre correctement ses bouchons d'oreille ? (Anim 055)
Destinée à tous les salariés exposés au bruit, cette vidéo explique pourquoi il est indispensable de porter des protections individuelles contre le bruit et montre les étapes essentielles à respecter pour bien mettre des bouchons qu'ils soient à former, pré-moulés ou moulés. L'INRS propose par ailleurs un ensemble de supports de sensibilisation sur le sujet. Source : http://www.inrs.fr/accueil/produits/mediatheque/doc/audiovisuels.html?refINRS=Anim-055
Hearing Loss and Use of Hearing Protection Among Career Firefighters in the United States
Objective : To determine the prevalence and characteristics of noise-induced hearing loss (NIHL) and the use of hearing protection devices (HPDs) among career firefighters. Methods : A Web-based survey and a standard audiometric test were performed with 425 firefighters from three states in the United States. Results : More than 40% showed hearing loss in the noise-sensitive frequencies (4 and 6 kHz). The left ear showed significantly poorer hearing than the right ear. Firefighters having longer years of work in fire services demonstrated significantly worse hearing. Reported use of HPDs was 34...
Assessment of subjective and objective measurement systems of earplug attenuation on an individual - RR975
Systems that measure earplug attenuation for individual wearers are commercially available and the work detailed in this report aimed to assess the performance and test the reliability of two types of available system: objective measurement and subjective equal loudness. Systems were chosen to represent a type of system rather than a specific model of device and because they: were commercially available through leading manufacturers; were designed for use by operators with a minimal level of training or expertise; could be used with a range of earplugs; and were typical of the state of the art...
The Importance of Properly Fitting Hearing Protection
Hearing loss is the No. 1 sensory disability in the world, and the World Health Organization estimates that 16 percent of hearing loss worldwide is attributable to occupational noise exposure. To minimize the risk of incurring hearing loss due to noise, it is important for organizations, employers and individuals to understand how they can better protect themselves and their employees from excessive noise in the workplace. Source : http://ehstoday.com/hearing-protection/importance-properly-fitting-hearing-protection
Sound Advice - noise at work in music and entertainment
Sound Advice contains practical guidelines on the control of noise at work in music and entertainment. Representatives of music and entertainment industries together with Environmental Health Officers and the Health and Safety Executive (HSE) prepared the guidance. For more details see About Sound Advice. On this site you will find out what you can do to avoid the harmful effects of prolonged exposure to noise - for yourself and for the people you employ or work with. It is closely related to a printed guide. Source : http://www.soundadvice.info/ http://www.hse.gov.uk/noise/musicsound.htm
L’effet d’occlusion est une source d’inconfort qui entraine une réduction du temps de port
Les bouchons d’oreille représentent la solution de protection auditive à court terme la plus utilisée en milieu de travail. Cependant, l’effet d’occlusion du canal auditif cause une modification de la perception de sa propre voix par le porteur et une amplification des bruits physiologiques. Il est donc une source d’inconfort qui entraine une réduction du temps de port. Source : Martin K. Brummund, Petit, Y., Sagard, F., Laville, F. Modélisation de l’effet d’occlusion des protecteurs auditifs de type bouchons d’oreille...
2 years after implementation of the Noise at Work Regulations for UK entertainment industry, the industry is failing to meet regulatory requirements.
From April 2008, the UK entertainment industry became regulated under the Noise at Work Regulations 2005, meaning that employers from orchestras to nightclubs are legally required to adhere to the same requirements (based on ISO 9612:2009) for controlling noise exposure for their staff. The majority of staff (70%) in all venues exceeded the daily noise exposure limit value in their working shift. Use of hearing protection was rare (<30%) and not enforced by most venues. The understanding of the hazard posed by noise was low, and implementation of the noise regulations was haphazard, with staff...
The Balancing Act: New Hearing Conservation Technology as Functional Enablers
Strike a balance between protecting workers' hearing and helping them maintain situational awareness and the ability to communicate. In this article, we will review the options hearing managers can employ to strike an appropriate balance among the challenges of achieving hearing protection, situational awareness and two-way communication. Source : http://ehstoday.com/hearing-protection/balancing-act-new-hearing-conservation-technology-functional-enablers
The ANSI S12.42 methods proposed by EPA’s provide consistent and reproducible results
This study tests the ANSI S12.42 methods with a range of hearing protection devices measured in field conditions. The average IPILs (impulse peak insertion loss) increased with peak pressure and ranged between 20 and 38 dB. For some protectors, significant differences were observed across protector examples of the same model, and across insertions. The EPA's (U.S. Environmental Protection Agency) proposed methods provide consistent and reproducible results. The proposed impulse NRR (noise reduction rating) rating should utilize the minimum and maximum protection percentiles as determined by...
While awaiting the new EPA's labeling regulation, train users to fit protectors correctly
EPA's final rule regarding hearing protection labeling is still pending. The proposed rule changes the very heart of the Noise Reduction Rating (NRR). The new NRR will be a range that is reported from very different testing methods than the old (current) NRR. These proposed labels do provide more information for the consumer but might also lead to some confusion. Knowing what kind of hearing protectors are best for a given situation will help understand the information provided on the new labels. The proposed method for labeling hearing protector includes the obvious but often misunderstood...
Clamping force and increased bulk increases discomfort and wearing difficulty for circum-aural hearing protectors
The physical properties of circum-aural hearing protectors, such as mass, clamping force and cup volume, have an influence on the attenuation performance of the device. This paper closely examines the physical and acoustic properties 39 of hearing protectors readily available to all users. The results indicate that attenuation increases with clamping force up to a limiting value of around 11 Newtons above which expected increases in attenuation are very small for large increases in clamping force. Likewise increasing the (newly introduced term) bulk of a hearing protector (volume, mass and cup...
“Hearing Conservation Programs” are not an adequate substitute for engineering and administrative controls.
Noise induced hearing loss is still too prevalent in American workplaces as the attempts at “hearing conservation programs” have proven inadequate. The author explains that the American workers have been the subjects in what has been largely a failed experiment for 28 years. Hearing protection devices are neither an efficient nor a humane replacement for eliminating the noise hazard and should once again be allotted their proper place in the control hierarchy. Several studies have found widespread and serious gaps in compliance with requirements such as audiometric testing, training...
Relatively high intelligibility scores are possible with an in-ear integrated hearing protection communications device.
Integrated hearing protection systems are designed to enhance free field and radio communications during military operations while protecting against the damaging effects of high-level noise exposure. A study was conducted to compare the effect of increasing the radio volume on the intelligibility of speech over the radios of two candidate systems, in-ear and muff-style, in 85-dBA speech babble noise presented free field. At the highest volume, subjects achieved 79% with the in-ear device but only 69% with the muff-style device, averaged across the gender of listener/talker pairs and consonant...
Suisse : succès impressionnant: depuis 1971, le nombre des lésions auditives est passé de 37 à 8 %
En Suisse, environ 200 000 personnes sont exposées, dans le cadre de leur activité professionnelle, à du bruit pouvant mettre en danger l'ouïe. Des stations d'examen mobiles ou audiomobiles se déplacent dans toute la Suisse pour examiner tous les travailleurs exposés au bruit dangereux pour l'ouïe dans le cadre de leur activité professionnelle, par exemple les ouvriers forestiers, les serruriers, les menuisiers, les agents de police et, depuis 1987, les musiciens d'orchestre. Les examens de contrôle réguliers, le conseil...
Using a Starter Pistol, generates 166dB impulse noise (peak )at 0.5m
At the shooters ear a blocked barrel .22 caliber Starter Pistol produces significantly higher sound pressure levels (7-18dB) than a comparable .22 caliber pistol, regardless of ammunition. Use of hearing protection is required for shooter. Closest athletes and potentially some spectators are at risk according to current NIOSH and WHO sound exposure guidelines. Using a Starter Pistol, which generates 166dB at 0.5m, the shooter will have to be 256 meters(!!) or ~280 yards away from the athletes to adhere to Electronic Starter requirements. Starter Pistols and/or Blanks are used for high school, university...
Bridge the gap between traditional hearing protection and communication.
The hearing capabilities of a worker are very important for communication, gaining situational awareness, and reducing the risk of other hazards or injury. However, understanding communications in extreme noise and at work sites is always challenging while wearing hearing protection. Too much protection and a worker cannot hear and is vulnerable to other safety hazards. Too little protection, and the worker is inadequately protected and at a higher risk for noise-induced hearing loss . For those who seek to bridge the gap between traditional hearing protection and communication, the technology...
Pneumatic nail guns produce loud “impulse” noise peaks in a range from 109 to 136 dBA.
Pneumatic nail guns produce short (less than a tenth of a second in du­ration) but loud “impulse” noise peaks: one from driving the nail and one from exhausting the air. Most nail gun manufacturers recommend that users wear hearing protection when operating a nailer. Available information indicates that nail gun noise can vary depending on the gun, the work piece, air pressure, and the work setting. The type of trigger system does not appear to affect the noise level. Peak noise emission levels for several nailers ranged from 109 to 136 dBA. These loud short bursts can contribute...
Less overall comfort of insert earplugs is associated with an increase in attenuation.
Noise-induced hearing loss is almost always preventable if properly fitted hearing protectors are worn to reduce exposure. Many individuals choose not to wear hearing protection because it may interfere with effective communication in the workplace or it may be uncomfortable. Hearing protector comfort has not received the same amount of attention as noise reduction capability. The present study was conducted to evaluate the comfort level of two different types of insert earplugs as well as the attenuation levels achieved by the earplugs. Attenuation levels were obtained with a commercially available...
Safety professionals cannot simply rely on the NRR found on hearing protector labeling!
For the first time in more than 30 years, the Environmental Protection Agency is set to update its regulations concerning hearing protection devices. Although many stakeholders are pleased that EPA is attempting to update the rule, some have expressed concern that the update may not make things clearer for the end user – and that could lead to problems. Using a range of NRR numbers instead of one number could make it more complicated for safety professionals to choose the right device, he said. “There just isn't any lab-based number we can put on a product that can tell you what...

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