EFFECTS OF NOISE ON ELECTROCARDIOGRAM : Part 2 Serum Electrolyte Variations Induced by Exposure to Noise
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In the previous report, the author reported the effects of noise on ECG. The results were summarized that an increase in the voltage of T wave was noted immediately after work in female workers, who had been working for at least 3 months in a textile fabric where 95 phon noise characterized by 600 to 4, 000 c.p.s. band was recorded. In this report, the relationship between variations of serum electrolytes, especially of Na and K concentrations, and ECG changes were investigated. Studies were made in 3 groups of female workers in the same textile fabric, namely, groups of workers of 2 weeks' experience (group A) and 7 months' experience (group B) and the control group (group C). Number subjects in these 3 groups as 25, 18, and 12, respectively. Serum Na ion concentration showed a slight decrease in group B, while no significant variation was seen in K ion concentration in all 3 groups after the work. In group B, however, K ion concentration was lower than in 2 other groups. Na/K ratio showed no significant change after the work in all 3 groups. In group C, serum Na and K ion concentrations showed no change immediately after one hour's exposure to the noise. In summary, a close relationship between the increase in T voltage and serum electrolytes level could not be found. The ECG changes might have been induced not only by variations of serum electrolytes but also by changes of the autonomic regulation mechanism.
- 社団法人 日本産業衛生学会の論文
社団法人 日本産業衛生学会 | 論文
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