10-Year prospective study of noise exposure and hearing damage among construction workers

Seixas, Noah S.; Neitzel, Richard L.; Stover, Bert; Sheppard, Lianne; Feeney, Patrick; Mills, David; Kujawa, Sharon G.

doi:10.1136/oemed-2011-100578

Cited by 92 publications

(74 citation statements)

References 30 publications

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“…2,[12][13][14][15][16][17] Maintaining a fluid barrier at the surface of the sensory epithelium after damage is necessary to preserve the electro-chemical gradient that drives HC depolarization and therefore sensory transduction after the onset of hearing (reviewed in Wangemann). 18 Several major stressors cause HC death, [19][20][21][22] including aging, noise trauma, and exposure to therapeutic drugs with ototoxic side effects. When a HC is killed by noise or aminoglycoside antibiotics, surrounding SCs form a filamentous actin (F-actin) cable that constricts the HC at its apex.…”

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confidence: 99%

Live imaging the phagocytic activity of inner ear supporting cells in response to hair cell death

et al. 2015

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Hearing loss and balance disorders affect millions of people worldwide. Sensory transduction in the inner ear requires both mechanosensory hair cells (HCs) and surrounding glia-like supporting cells (SCs). HCs are susceptible to death from aging, noise overexposure, and treatment with therapeutic drugs that have ototoxic side effects; these ototoxic drugs include the aminoglycoside antibiotics and the antineoplastic drug cisplatin. Although both classes of drugs are known to kill HCs, their effects on SCs are less well understood. Recent data indicate that SCs sense and respond to HC stress, and that their responses can influence HC death, survival, and phagocytosis. These responses to HC stress and death are critical to the health of the inner ear. Here we have used live confocal imaging of the adult mouse utricle, to examine the SC responses to HC death caused by aminoglycosides or cisplatin. Our data indicate that when HCs are killed by aminoglycosides, SCs efficiently remove HC corpses from the sensory epithelium in a process that includes constricting the apical portion of the HC after loss of membrane integrity. SCs then form a phagosome, which can completely engulf the remaining HC body, a phenomenon not previously reported in mammals. In contrast, cisplatin treatment results in accumulation of dead HCs in the sensory epithelium, accompanied by an increase in SC death. The surviving SCs constrict fewer HCs and display impaired phagocytosis. These data are supported by in vivo experiments, in which cochlear SCs show reduced capacity for scar formation in cisplatin-treated mice compared with those treated with aminoglycosides. Together, these data point to a broader defect in the ability of the cisplatin-treated SCs, to preserve tissue health in the mature mammalian inner ear. . 4 SCs perform many functions, including providing critical trophic factors, preventing excitotoxicity, and mediating regeneration in those systems (non-mammalian vertebrates) capable of replacing lost HCs. 5-11 When HCs die, SCs also preserve the integrity and function of the remaining tissue by forming scars and clearing dead HCs. 2,12-17 Maintaining a fluid barrier at the surface of the sensory epithelium after damage is necessary to preserve the electro-chemical gradient that drives HC depolarization and therefore sensory transduction after the onset of hearing (reviewed in Wangemann). 18 Several major stressors cause HC death, 19-22 including aging, noise trauma, and exposure to therapeutic drugs with ototoxic side effects. When a HC is killed by noise or aminoglycoside antibiotics, surrounding SCs form a filamentous actin (F-actin) cable that constricts the HC at its apex. 2,[12][13][14][15][16][17] This process separates the apical portion of the cell, including the stereocilia bundle, from the HC body and preserves a sealed reticular lamina. 23 In the chick utricle, following the apical constriction of dead HCs, the SCs engulf and phagocytose the remaining HC corpse. 15 Additional data from the chick indicate that the ototoxi...

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confidence: 99%

Live imaging the phagocytic activity of inner ear supporting cells in response to hair cell death

et al. 2015

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“…The adverse relationship between NIHL and work experience in this study can be considered an important fac- tor for hearing loss, as indicated by other investigators (33)(34)(35)(36). Years of active work was considered as the basic measure for the chronic status of noise exposure.…”

Section: Discussionmentioning

confidence: 99%

“…Years of active work was considered as the basic measure for the chronic status of noise exposure. In this regard, calculation of daily hours of active work constitutes another measurement method, which is by itself more detailed (36). Since the auditory effect of noise is gradual, estimating the exposure time by only measuring the working hours is not adequate; therefore, use of a larger time frame, similar to the one applied in the present study, is often needed.…”

Section: Discussionmentioning

confidence: 99%

Occupational Noise Exposure and Hearing Impairment among Spinning Workers in Iran

Saberi

Ghasemi

2017

Iran Red Crescent Med J

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Background: Hearing impairment (HI), resulting from noise exposure, can be incapacitating and irreversible. Objectives: The present study aimed to determine the relationship between noise exposure and HI among workers and employees in a spinning industry. Methods: This cross sectional study was conducted on 489 workers in a spinning industry in Iran during 2015. The census method was applied for the purpose of sampling. The hearing threshold of each ear was determined during work shifts, using Madsen audiometric device. HI was calculated, based on the guidelines by the American Medical Association (AMA). The effects of different variables on HI were assessed via regression analysis.

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“…However, mechanized construction is noisy, with the most powerful equipment often being the loudest [9]. Hand-held electrical equipment is versatile and precise; there is a diverse range of such tools, and they are often inexpensive.…”

Section: Introductionmentioning

confidence: 99%

Noise Generated by Portable Saw in Different Construction Materials

Barbosa¹,

Bertoli²

2017

AJCEA

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As part of efforts to identify sources of noise pollution from construction, a methodology is developed here for the standardized assessment of noise from masonry saws, which are electric cutters that are commonly used in the industry. Such standardized assessments could aid the development of quieter machines and also of less disruptive and safer industrial practices. The proposed methodology compares the noise generated during cutting with that of free-running non-cutting equipment in accordance with ISO 3744:2010, which specifies methods of determining sound power levels of noise sources via measurement of sound pressure for an essentially free field over a reflecting plane. The cutting of the proposed standard load (concrete slabs) and different building materials was louder than the disengaged saw. The highest observed sound power level was 110.1 dB. The smallest difference observed between the cutting and disengaged saw was 5.5 dB. Noise generated by the saw was quantitatively assessed. The results allowed a standard material to be proposed for use in tests determining the sound power levels of masonry saws. This study also contributes to the analysis of occupational noise generation, considering the difficulties in obtaining previously reported values of the sound spectrum of masonry saws.

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10-Year prospective study of noise exposure and hearing damage among construction workers

Cited by 92 publications

References 30 publications

Live imaging the phagocytic activity of inner ear supporting cells in response to hair cell death

Live imaging the phagocytic activity of inner ear supporting cells in response to hair cell death

Occupational Noise Exposure and Hearing Impairment among Spinning Workers in Iran

Noise Generated by Portable Saw in Different Construction Materials

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