騒音の心電図におよぼす影響に関する研究 : 第1報 騒音による心電図の変化について
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The purpose of this paper is to report the effects of noise upon electrocardiographic tracings of the workers. The studies were done in a textile fabric, where noises of 95 phon, 600 to 4000 c.p.s., were recorded. 20 female workers of 3 to 8 year's experience and 22 female workers of less than 6 months' experience were chosen for this study. The latter group was studied in the second week, the third month and the sixth month from the beginning of their work. In the former group of longer working experience, no significant variations of PQ, QRS, QT and RR intervals and R height were observed, while augmented T wave after 8 hours' exposure was noted, which declined down to the control level within 12 hours after the cessation of the work. In the latter group of 6 months' experience, again no significant variations of PQ, QRS, QT intervals and R height were observed, while increased voltage in T wave after 8 hours' labor was noted, in the group of more than 3 months' experience which declined down to the control level within 12 hours after the cessation of the work. Tendency toward prolongation of RR interval after 8 hours' work was noted in the group of more than 6 months' experience. These electrocardiographic variations were not observed in the group working in the place where noise level of less than 60 phon was recorded. These findings suggest that the electrocardiographic variations are presumably due to the effects of noise. In order to clarify the effects of noise immediately after the onset and discontinuance of the exposure to the noise, 12 unexperienced subjects were put under the noise of 103 phon, 600 to 8000 c.p.s., for 60 minutes. Before, during and after the procedure, continuous electrocardiograms were taken. Fluctuation of T height, with less marked variations of RR interval and R voltage were observed during 10 minutes after the onset and discontinuance. In summary, the effects of noise on electrocardiographic tracings were almost invariably seen as an augmentation of T wave immediately after the cessation of work.
- 社団法人日本産業衛生学会の論文
- 1964-02-20
著者
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