Annals of Occupational and Environmental Medicine

Original Article

Cerebrovascular, and Other Health Effects, Due to the Exposure of Ex-Workers to Carbon Disulfide in the Maunfacture of Rayon: Joo Ja Kim, Kyung Jae Lee, Hyun Sook Hong, Dae Ho Kim; Korean Journal of Occupational and Environmental Medicine 2003;15(1):72-83. Published online March 31, 2003; DOI: https://doi.org/10.35371/kjoem.2003.15.1.72

Abstract PDF: OBJECTIVE: The purpose of this study was to evaluate the cerebrovascular and other related health effcets, due to the exposure of ex-workers to carbon disulfide in the manufacture of rayon.
METHODS
The study subjects comprised of 453 workers from the rayon manufacturing industry (387 males, 66 females). They were examined with a brain MRI and for other risk factors related to their occupation, such as age, work department, work duration, duration of work cessation, and blood pressure. Laboratory tests were also performed such as blood sugar, hemoglobin, cholesterol, etc. The cumulative exposure levels were calculated as the mean exposure level, per work department, multiplied by the total work duration in months.
RESULTS
75.1% of the subjects were between the ages of 40 and 59 years. 76.0% of the subjects had worked in high exposure departments (e.g., department of spinning and refining etc). 52.5% of the subjects had worked for more than 10 years, and 63.3% of the subjects had ginven up the work (exposure) more than 10 years earlier. The brain MRI findings were normal, a single lacunar infarct, multiple lacunar infarcts (mostly, on subcortex and white matter), and a hemorrhage in 52.5, 8.6, 36.2 and 2.7% respectively. Multiple lacunar infarcts were not related to the cumulative exposure level but in the female workers only, were significantly related to the increasing level of work duration (p<0.05), and in the male workers only, were related to the increased duration of work cessation and age (p<0.01). Abnormal rates of laboratory tests were higher in the multiple lacunar infarcts subjects with hypertension compared to theose with normal brain MRI findings (p<0.01).
CONCLUSIONS
The multiple lacunar infarcts of the brain seemed not to be related to the cumulative exposure level but to the low exposure departments, duration of work, duration of work cessation, age and hypertension. This was conducted as a health evaluation on workers from the rayon manufacturing industry who had terminated their exposure to carbon disulfide many years earlier.

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Original Article

Influence of Shiftwork Duration on Blood Pressure and Heart Rate Variability in Short Rotating 8-hour Shiftworkers: Mi Na Ha, Jai Young Kim, Jung Sun Park, Ho Keun Chung; Korean Journal of Occupational and Environmental Medicine 2001;13(2):180-189. Published online June 30, 2001; DOI: https://doi.org/10.35371/kjoem.2001.13.2.180

OBJECTIVES
This study was performed to investigate the chronic health effect of shiftwork on cardiovascular system.
METHODS
We checked blood pressure(BP) and heart rate variability(HRV) at every shift on 134 male workers whose shift type was 8-hour and short rotating of 3 days shift interval. As confoundings, job stress was measured by Karasek's JCQ 49 items questionnaire and circardian type was assessed by morningness-eveningness questionnaire. Smoking and alcohol drinking habit, marital status and past medical history were also acquired. We used the method of repeated measured data analysis with mixed model to show the association between shiftwork duration and BP or HRV.
RESULTS
Average age of workers was 29 years olds(range 25~44). Among them, 77.9 % were current smokers, 50 % were the passive type of job strain in Karasek's model. Mean shiftwork duration was 5.21 years(range 5.4 months~10 years). In circadian type, no one was definitely morning type or definitely evening type. In multivariate analyses adjusted by age, job strain, shift, circadian rhythm and smoking, blood pressure were showed significantly increasing trends according to shiftwork duration in both systolic and diastolic(p<0.05). Heart rate variability were also showed significantly decreasing trends according to shiftwork duration in both parasympathetic and sympathetic functions(p<0.05).
CONCLUSIONS
The results of this studs suggests the chronic negative health effect of shiftwork on cardiovascular system.

Citations

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