Assessment of exposure to voices and noise via earphones in manufacturing industry workers in Japan.

OBJECTIVES: There is concern that sound via earphones and headphones attached to headsets used in workplaces may be a risk factor for noise-induced hearing loss (NIHL). Although there are some previous studies investigating exposure to noise from headphones, almost none have assessed the risks to workers who use earphones. We assessed exposure to noise among workers who regularly wear earphones in noisy workplaces. METHODS: The subjects of this study were 21 workers who regularly wear earphones in three manufacturing companies in Japan. The sound pressure output from earphones and personal exposure to occupational noise was measured for each worker. A noise-dosimeter was used to measure individual exposure to occupational noise. The sound pressure output from the earphones was measured by recording the electric signal with a data recorder attached to the earphones, and the recording was analyzed by playing it back in the laboratory through a sound analyzer via an ear simulator. RESULTS: The mean scores for personal exposure and earphone output LAeq were 87.9 dB and 87.6 dB, respectively. Earphone output LAeq exceeded 85 dB for two-thirds of the subjects. Nearly all the subjects lacked hearing protection devices (HPDs) on their earphones. CONCLUSIONS: The results suggest that workers who use earphones in noisy workplaces are exposed to the following NIHL risk factors: (1) they are deprived of the opportunity to fit appropriate HPDs, and (2) the sound pressure output from the earphones themselves exceeds the occupational exposure limit.

Controlled trial of worksite health education through face-to-face counseling vs. e-mail on drinking behavior modification.

This study examined the effectiveness of a traditional face-to-face health education and e-mail health education on alcohol usage among male workers in comparison with a control group. Male workers at a manufacturing plant (N=36) who had abnormal serum gamma-GTP were stratified by age and job types, then randomized into three groups: face-to-face education, e-mail education, and the control. The subjects were assessed on their knowledge about and attitude towards drinking, reported alcohol consumption, and serum gamma-GTP before the start of education and 2 months later after comparison of the education. Paired t-test and repeated ANOVA were conducted to test the significance of changes pre and post the intervention and across groups. In the face-to-face group, knowledge (p=0.001), attitude (p=0.026), alcohol consumption (p=0.003) and serum gamma-GTP showed significant improvement. In the e-mail group, only alcohol consumption showed marginal improvement (p=0.077). In the control group, no variables remarkably changed. These results indicate that the face-to-face health education was more effective than the e-mail program. We discuss why the face-to-face approach was superior to the e-mail approach in this study by referring to self-monitoring, goal setting processes and timely feedback. We concluded that further studies are warranted to identify the effect of health education using e-mails and other network tools in consideration of the above three factors.