Annals of Occupational and Environmental Medicine

Research Article

The effect of long working hours on 10-year risk of coronary heart disease and stroke in the Korean population: the Korea National Health and Nutrition Examination Survey (KNHANES), 2007 to 2013: Dong-Wook Lee, Yun-Chul Hong, Kyoung-Bok Min, Tae-Shik Kim, Min-Seok Kim, Mo-Yeol Kang; Ann Occup Environ Med 2016;28:64. Published online November 15, 2016; DOI: https://doi.org/10.1186/s40557-016-0149-5

Background

Recently, the emergence of long working hours and the associated conditions such as coronary heart disease (CHD) and stroke have gained attention. The aim of this study was to investigate the association between long working hours and the 10-year-risk of CHD and stroke, estimated by Jee’s health risk-appraisal model for ischemic heart disease.

Methods

We analyzed data from Koreans who randomly enrolled in Korean National Health and Nutrition Examination Survey 2008–2012 and finally included 13,799 participants. The participants were classified as per their working hours: 0–30 h/week, 31–39 h/week, 40 h/week, 41–50 h/week, 51–60 h/week, 61–70 h/week, 71–80 h/week, and >80 h/week. The risks for CHD and stroke were determined using Jee’s health risk-appraisal model. Multiple logistic regression was used to analyze the association between working hours and 10-year risk for CHD.

Results

The 10-year risks for CHD and stroke were significantly and positively associated with working hours in both men and women. Furthermore, higher risks for CHD and stroke were associated with longer working hours in women.

Conclusion

Long working hours are significantly associated with the risks of CHD and stroke, estimated by Jee’s health risk-appraisal model. This study suggests the need for proper management of working hours to reduce CHD risk and stroke risk in the Korean population.

Electronic supplementary material

The online version of this article (doi:10.1186/s40557-016-0149-5) contains supplementary material, which is available to authorized users.

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Case Report

A Study Regarding the Work Fitness of a Manufacturing Worker Suffering from a Stroke and Muscle Weakness: Eun Kwang Ryu, Jae Seung Yong, Jung Won Kim; Korean Journal of Occupational and Environmental Medicine 2012;24(3):294-303. Published online September 30, 2012; DOI: https://doi.org/10.35371/kjoem.2012.24.3.294

Abstract PDF: OBJECTIVES
Occupational health and safety guidelines have the goals of protecting workers, helping them to adapt to their working environment, and to promote their health and ability. In the work fitness evaluations done by occupational medicine doctors, one of their subjective duties is to assess a worker's working ability so as not to affect the health of the worker or his/her co-workers. A worker's functional capacity and reasonable accommodations should be considered. We studied a case regarding cerebral hemorrhage and muscle weakness after renal disease.
CASE
This patient was a male who worked at a tobacco company. He suffered from acute renal failure in 2003. In 2004, during his treatment, a convulsion-seizure occurred. This patient had non-specific findings in family history, blood studies, urinary analysis, mental status examination, and showed no signs of depression. There was a decrease in muscle power found during a physical examination. As a result, an occupational and environmental doctor and an industrial hygienist went to the worker's company in order to analyze the workers tasks. They concluded that there were some problems regarding the worker' s daily activities. When considering reasonable accommodation it was determined that such cases could work in the qualify control department instead of current job, assembly department.
CONCLUSIONS
Throughout this case, we considered the work compatibility of the various complications arising from a cerebral hemorrhage and convulsion-seizure disease which occurred to a factory worker who suffered from acute renal failure. We recommend it essential to create work compatibility guidelines regarding this case presentations, ensuring consistency to the efforts made by health care workers and physicians.

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Case Report

A Case of Heat Stroke in an Aluminium Utensil Plant: Soon Woo Park, You Lee Cho, Dong Ho Oh, Jung Yon Choe, Hae Ri Jun; Korean Journal of Occupational and Environmental Medicine 1999;11(2):293-303. Published online June 30, 1999; DOI: https://doi.org/10.35371/kjoem.1999.11.2.293

Abstract PDF

An 18-year-old man suffered heat stroke after continuous working for 26 hours on his first day in an aluminium utensil plant in August 1998. His job was to put a pressed aluminium utensil on the conveyer before the process of spray painting. The ranges of temperature and relative humidity measured at the local weather-station during the patient' s working period were 23.6-30.2 degrees C, 49-87 % respectively. On arrival the patient was comatose and suffered generalized seizure three times. His rectal temperature was 41.2 degrees C . blood pressure was 90/60 mmHg, pulse was 148 beats/minute and respiratory rate was 28 times/minute. The serum level of AST was 421 IU/L. ALT was 205 IU/L, LDH was 1,160 IU/L. myoglobin was higher than 500 ng/mL. OK was higher than 2,000 IU/L. He recovered consciousness 7th day of admission and discharged after 2 months but cerebellar dysarthria was remained. The patient felt himself several prodromal symptoms of heat stroke and he showed awkward behavior considered to be drowsiness, but the patient and his co-workers neglected them. This case report shows that heat stroke can be occurred in a condition that ambient temperature, humidity, and working load are not extreme. A thorough health education and management concerned with guidelines on salt and water intake, detection of early symptoms of heat-related illness, prompt body cooling and rapid transportation to a hospital is necessary.

Citations

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