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Insomnia and hearing impairment among occupational noise exposed male workers.

ABSTRACT: The aim of this study was to investigate the association between insomnia and hearing impairment among workers exposed to occupational noise.This study included 809 male workers exposed to occupational noise. The participants underwent audiometric testing, and their insomnia was examined based on the Insomnia Severity Index test. Hearing impairment was defined as hearing threshold >25 dB hearing level in the range of 1-4 kHz.According to analysis of covariance, it was observed that pure tone audiometry thresholds at 1-2 kHz in the right ear and at 1 kHz in the left ear were significantly higher among workers with insomnia compared to those with no insomnia. Multiple logistic regression analysis of insomnia for hearing impairments was performed, which showed the odds ratio was 1.806 (95% confidence intervals: 1.022-3.188, p = 0.042) after adjustment for age, working period, noise level, snoring, use of protection devices, diabetes mellitus, hypertension, smoking, alcohol consumption, regular exercise, waist circumference, total cholesterol, triglyceride and high density lipoprotein cholesterol.Insomnia could be associated with hearing impairment in workers who are exposed to occupational noise. Additionally, insomnia may be associated with decreased hearing at low frequencies. Especially, more efforts are required to improve the quality of sleep for workers who are exposed to loud occupational noise. Further well- designed prospective studies are needed to clarify the relationship between insomnia and hearing impairment.

SUBMITTER: Lim HM

PROVIDER: S-EPMC5558741 | biostudies-other | 2017

REPOSITORIES: biostudies-other

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The rate of occupational noise-induced hearing loss among male workers in Israel and implication on hearing surveillance frequency.

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Occupational Noise-Induced Hearing Loss among Migrant Workers in Kuwait.

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Bilateral high-frequency hearing loss is associated with elevated blood pressure and increased hypertension risk in occupational noise exposed workers.

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Occupational noise exposure and hearing: a systematic review.

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Analysis of lncRNA-mRNA expression pattern in male textile workers with noise-induced hearing loss.

Project description:Background:Extracellular long non-coding RNA (lncRNA) has attracted increasing attention as a potential biomarker to indicate disease status and physiological process. It plays a unique role in pathogenesis, and may be a new potential biomarker, especially for chronic hearing loss. Early screening of NIHL susceptible population is of great significance in reducing the incidence of NIHL. Methods:The expression profiles of lncRNAs and mRNAs in serum of noise-induced hearing loss (NIHL) and exposure groups were detected by microarray technique in serum. The differentially expressed mRNAs was analyzed by GO and KEGG to identify related biological functions and signaling pathways. The top up-regulated and down regulated lncRNAs were identified by qRT-PCR. Results:A total of 2,072 differentially expressed lncRNAs (889 up-regulated and 1,183 down-regulated) were included in NIHL subjects compared to exposed group by using microarrays. GO enrichment and KEGG pathway analysis showed that the expression pattern of mRNAs in serum of NIHL was associated with noise exposure. LncRNAs were verified by qRT-PCR, namely, LOC101928211, LOC101928804, and BANCR. The expression of LOC101928211 and LOC101928804 in the NIHL group was significantly higher than that in the exposed group, while the expression of BANCR was obviously decreased (P<0.001). Conclusions:In this study, lncRNAs and mRNAs expression profile in NIHL was preliminarily investigated in silico. The newly discovered lncRNAs might be involved in the pathological process of hearing loss and may serve as potential biomarkers to indicate long-term noise exposure-induced hearing loss.

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Association between genetic variations in GRHL2 and noise-induced hearing loss in Chinese high intensity noise exposed workers: a case-control analysis.

Project description:The grainyhead like 2 (GRHL2) is a transcription factor, and the role among noise exposed workers is not well established. We tested whether GRHL2 polymorphisms are associated with the risk of noise-induced hearing loss (NIHL) in Chinese high intensity noise exposed workers. We genotyped six polymorphisms of GRHL2 gene (i.e., rs611419, rs3779617, rs3735713, rs3735714, rs3735715, and rs6989650) of 340 NIHL cases and 356 control subjects who exposed to noise higher than 85 dB (A) [Lex, 8 h=time-weighted average of levels of noise exposure (Lex) for a nominal 8?h working day] in a Chinese population. Compared with rs611419 AA genotype, the AT/TT genotypes conferred protection against NIHL [adjusted odds ratio (OR)=0.71, 95% confidence interval (CI)=0.52-0.98]. No altered NIHL risk was associated with the other five polymorphisms. In the combined analyses, we found that the combined genotypes with three to eight variant alleles were associated with an decrease risk of NIHL compared with those with zero to two variant alleles, and the decrease risk was more pronounced among subgroups of exposure time>20?yr (0.31, 0.16-0.62) and drinkers (0.51, 0.29-0.90). Polymorphisms of GRHL2 may positively contribute to the etiology of NIHL.

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Occupational noise and age: A longitudinal study of hearing sensitivity as a function of noise exposure and age in South African gold mine workers.

Project description:BACKGROUND:A relationship exists between occupational noise exposure and age, which remains poorly understood. OBJECTIVES:The aim of this study was to establish the relationship between hearing loss and age over time. METHOD:Audiological data from 2583 mine workers in South Africa were utilised. Data were received from a non-noise exposed group (NNEG) (n = 951) and a noise exposed group (NEG) (?85 dBA) (n = 1632). Data comprised a low-frequency average (LFA512) (average of audiological thresholds for 0.5 kHz, 1 kHz and 2 kHz) and high-frequency average (HFA346) (average of audiological thresholds for 3 kHz, 4 kHz and 6 kHz). Data were compared by using mixed-effects regression analysis. RESULTS:Base threshold values were higher for the NEG than for the NNEG across frequencies. All year-to-year increases in mean hearing thresholds were statistically significant (p 0.01). When correcting for age, increases in mean hearing thresholds were higher for the NEG than for the NNEG for HFA346 (3.5 dB vs. 2.9 dB decline over a 4-year period) but similar for LFA512 (0.6 dB vs. 0.7 dB decline). Uncorrected for age, increases in mean hearing thresholds were higher than when age was corrected for. CONCLUSION:Age and occupational noise exposure influence hearing thresholds over time. The continued increase in hearing thresholds of the NEG above that of the NNEG can be related to ineffective noise management programmes and/or the fact that early noise exposure leads to a higher burden of hearing loss over time - even after noise exposure had stopped.

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Project description:Insomnia among workers reduces the quality of life, contributes toward the economic burden of healthcare costs and losses in work performance. The relationship between occupational stress and insomnia has been reported in previous studies, but there has been little attention to temperament in occupational safety and health research. The aim of this study was to clarify the relationships between temperament, occupational stress, and insomnia. The subjects were 133 Japanese daytime local government employees. Temperament was assessed using the Temperament Evaluation of Memphis, Pisa, Paris, and San Diego-Auto questionnaire (TEMPS-A). Occupational stress was assessed using the Generic Job Stress Questionnaire (GJSQ). Insomnia was assessed using the Athens Insomnia Scale (AIS). Stepwise multiple logistic regression analyses were conducted. In a stepwise multivariate logistic regression analysis, it was found that the higher subdivided stress group by "role conflict" (OR = 5.29, 95% CI, 1.61-17.32) and anxious temperament score (OR = 1.33; 95% CI, 1.19-1.49) was associated with the presence of insomnia using an adjusted model, whereas other factors were excluded from the model. The study limitations were the sample size and the fact that only Japanese local government employees were surveyed. This study demonstrated the relationships between workers' anxious temperament, role conflict, and insomnia. Recognizing one's own anxious temperament would lead to self-insight, and the recognition of anxious temperament and reduction of role conflict by their supervisors or coworkers would reduce the prevalence of insomnia among workers in the workplace.

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