Overwork and cerebrocardiovascular disease in Korean adult workers

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  • Jang Tae-Won
    Department of Occupational and Environmental Medicine, College of Medicine, The Catholic University of Korea
  • Kim Hyoung-Ryoul
    Department of Occupational and Environmental Medicine, College of Medicine, The Catholic University of Korea
  • Lee Hye-Eun
    Department of Occupational and Environmental Medicine, College of Medicine, The Catholic University of Korea
  • Myong Jun-Pyo
    Department of Occupational and Environmental Medicine, College of Medicine, The Catholic University of Korea
  • Koo Jung-Wan
    Department of Occupational and Environmental Medicine, College of Medicine, The Catholic University of Korea
  • Ye Byeong-Jin
    Department of Occupational and Environmental Medicine, College of Medicine, Dong-A University
  • Won Jong-Uk
    Department of Preventive Medicine, Yonsei University College of Medicine

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Objectives: Long work hours and overwork may increase the cardiovascular load of workers. But long work hours and overwork are not the same. Cardiovascular overload from working is dependent on the physical demand of the work and the worker's physical fitness, as well as the working hours. This cross-sectional study was designed to identify the association between overwork and cerebrocardiovascular disease, taking into account the physical demand of work, physical fitness, and work hours. Methods: Study data were obtained from surveillance of occupational cerebrocardiovascular disease. Questionnaire surveys including general and work-related characteristics were conducted. Maximum acceptable work time was estimated using the physical work demand and physical fitness of the subjects. The overwork index, which was the ratio of maximum acceptable work time and actual work hours of the subjects, was calculated. Results: In the workers with a moderate or high physical demand of work, the adjusted odds ratios for overwork indexes of 1.01–1.20, 1.21–1.50, and >1.50 were 2.679 (95% confidence interval (CI) 1.025–6.999), 3.124 (95% CI 1.111–8.783), and 4.331 (95% CI 1.719–10.908), respectively. Conclusions: The results indicate that the risk of cerebrocardiovascular disease might be high in the workers with long working hours, high physical demand of work, and poor physical fitness engaged in work with a moderate to high physical work demand. Work hours should be accommodated according to the worker's physical fitness and the physical demand of work, and this could lower the risk of cerebrocardiovascular disease.(J Occup Health 2015; 57: 51–57)

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