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pp.470-476
Published Date 1954/10/20
DOI https://doi.org/10.11477/mf.1492201198

KOZEKI studies the effect of occupational noise on hearing among employees of a telegraphic office. The volume of noise during the business hours ranged from the lowest 62 phons to the highest 80 phones; the peak be-ing at the hours between 11 and 12 and again at 17. Before 8 and after 18 when the office is closed for business the noises registered were almost negligible. The sucjects showed hearing fatigue at the end of the day; slight insomnia and loss of appetite. Many of them showed vascular prominene about the handle of maleus which was more prevalent in the left ear. Whisper test showed the left ear to be involved more than the right. Audio-metric test showed dipping at 3,000 to 4,000 cycles by both air and bone conductions. In few cases by bone conduction a moderate loss was registered at tonal range 500 to 1,000 cy-cles.


Copyright © 1954, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 印刷版ISSN 0386-9679 医学書院

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