騒音性難聴に関する研究

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タイトル別名
  • STUDIES ON OCCUPATIONAL DEAFNESS
  • 騒音性難聴に関する研究-2-
  • ソウオンセイ ナンチョウ ニ カンスル ケンキュウ 2
  • 騒音性難聴に関する研究-1-
  • ソウオンセイ ナンチョウ ニ カンスル ケンキュウ 1
  • Rep. 1. Subjective symptoms concerning auditory apparatus and various fatigue

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The author investigated subjective symptoms concerning auditory apparatus, and somatic, neurosensuous and spiritual function for 237 workers who work in a certain noisy factory. The chief findings are as follows.<br>1) The number of subjective symptoms was most frequent in the workers of the forging shop when duties were classified.<br>2) In the age group the percentage of subjective symptoms of spiritual and somatic function decreased with ageing, while the tendency of neurosensuous function were seen to inversely increase with the rise in age.<br>3) The workers complaining of the disturbance of sleep were seen in 17% of all workers, 38% of the forging shop and 34% of the rivetting shop.<br>4) Feeling of hard-hearing and tinnitus were the most frequent of all these symptoms. However, emotional feeling such as anxiety, irritable etc. and headache were considerably less in comparison.<br>5) Subjective symptoms concerning auditory apparatus were observable in the frequency order of hard of hearing, tinnitus and vertigo, with the percentage of 56%, 36% (16% of cases of continous tinnitus), 13%.<br>6) It was mostly 3-5 years after their engagement in work that the workers were first consious of feeling of hard-hearing, tinnitus or vertigo.<br>7) Feeling of hard-hearing, tinnitus and vertigo were found more frequently with the progress of the year of service, but it was observed that tinnitus was inversely diminished above 20 years of service.<br>8) So-called paracusis Willisiana was observed in 13 cases of all workers.<br>9) A majority of the cases of tinnitus was found in both ears.<br>10) Vertigo was mostly seen at standing and in their work. Welding shop showed more vertigo than others.

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