Effects of overtime work on blood pressure and body mass index in Japanese male workers

Wada, Koji; Katoh, Noritada; Aratake, Yutaka; Furukawa, Yasushi; Hayashi, Toshio; Satoh, Emi; Sakurai, Toshihiko; Aizawa, Yoshifusa

doi:10.1093/occmed/kql106

Cited by 41 publications

(42 citation statements)

References 7 publications

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“…However, the results of these studies have varied considerably. Some studies reported that an increase in working hours promoted the onset of hypertension 16, 21−23) ; others reported that an increase in working hours suppressed the onset of hypertension 24,25) ; and still some other studies reported no association between the onset of hypertension and an increase in working hours 26,27) . In our present study, we found no association between the onset of hypertension and the number of hours worked.…”

Section: Working Hoursmentioning

confidence: 99%

Associations of Work Hours and Actual Availability of Weekly Rest Days with Cardiovascular Risk Factors

Itani

Kaneita

Ikeda

et al. 2013

Journal of Occupational Health

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Associations of Work Hours and Actual Availability of Weekly Rest Days with Cardiovascular Risk Factors: Osamu ITANI, et al. Division of Public Health, Department of Social Medicine, Nihon University School of Medicine— Objectives The aim of study was to determine the associations of work hours and actual availability of weekly rest days with the onset of lifestyle‐related diseases such as obesity, hypertension, hypertriglyceridemia, low levels of high‐density lipoprotein (HDL) cholesterol and hyperglycemia. Methods For this longitudinal study, we used data from checkups conducted in 1999 and 2006 for 30,194 men who worked for a local public institution in Japan. We calculated the cumulative incidence rates of onset of obesity, hypertension, hyperglycemia, hypertriglyceridemia and low HDL cholesterol over this 7‐year period and performed a χ2test to determine the association between the above diseases and work conditions (work hours and actual availability of weekly rest days) at the time of the baseline survey. We then performed multiple logistic regression analysis of the diseases that showed significant associations. Results The adjusted odds ratio for the onset of hypertriglyceridemia in subjects who worked ≥9 hours was high (1.11 [95% CI: 1.02−1.22], p=0.02) in comparison with those who worked <9 hours. The adjusted odds ratio for the onset of hypertriglyceridemia in subjects who could not often take weekly rest days was high (1.13 [95% CI: 1.01−1.27], p=0.03) in comparison with those who were able to take most of the available weekly rest days off work. Conclusions These results show that work hours and actual availability of weekly rest days independently predict the onset of hypertriglyceridemia. Working only regular hours and taking advantage of weekly rest days can contribute to the prevention of hypertriglyceridemia.

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Section: Working Hoursmentioning

confidence: 99%

Associations of Work Hours and Actual Availability of Weekly Rest Days with Cardiovascular Risk Factors

Itani

Kaneita

Ikeda

et al. 2013

Journal of Occupational Health

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“…Most studies, except few literatures 18,19) , on the relation between work hours and obesity have been conducted in Western countries where working hours are short compared with Asian countries such as Korea. Until 2007, Korean workers had the longest working hours among countries in the Organization for Economic Cooperation and Development (OECD), and from 2008 to 2011 had the second longest working hours 20) .…”

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confidence: 99%

Long Work Hours and Obesity in Korean Adult Workers

Jang

Kim

Lee

et al. 2013

Journal of Occupational Health

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25 or over 64 years, pregnant women, part-time workers, soldiers, housewives and students were excluded. The total number of individuals included in the analysis was 8,889 (5,241 male and 3,648 female subjects). The outcome variable was obesity, defined as body mass index ≥25 kg/m 2 . Variables considered in the model were age, education, income, marital status, alcohol drinking, smoking, daily energy intake, physical activity, sleep hours per day, the type of job, work hours, and work schedule. Work hours were categorized as <40, 40−48 (reference), 49−60, and >60 hours per week. Results: In the multiple SURVEYLOGISTIC regression analyses, the adjusted odds ratio of obesity for long work hours (>60 hours per week) in male manual workers was 1.647 (95% confidence interval 1.262−2.151). Long work hours did not significantly increase the odds ratio for obesity in male nonmanual workers and female manual and nonmanual workers. Conclusions: More than 60 work hours per week increased the risk of obesity in Korean male manual workers. This result might be helpful in preventing obesity in Korean adult workers, especially male manual workers. (J Occup Health 2013; 55: 359-366)

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“…Data from more than Japanese 50,000 workers from 4 companies were evaluated. The results showing an inverse association between overtime work and prevalence of hypertension contradicted two former studies (Artazcoz et al, 2009;Yang et al, 2006), but confirmed others (Wada et al, 2006;Nakanishi et al, 2001). Despite the large database, the authors highlighted the cross-sectional design as the main study limitation that left the possibility open of residual effects of potential confounders and differences in assessments of overtime and blood pressure evaluation among the companies.…”

Section: Health and Working Timementioning

confidence: 58%

21st International Symposium on Shiftwork and Working Time: The 24/7 Society – From chronobiology to practical life

Fischer

Puttonen

Skene

2014

Chronobiology International

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Effects of overtime work on blood pressure and body mass index in Japanese male workers

Abstract: The results of this study indicate that workers whose mean overtime was > or =50 h have lower risks of developing definite hypertension and increasing their BMI.

Cited by 41 publications

References 7 publications

Associations of Work Hours and Actual Availability of Weekly Rest Days with Cardiovascular Risk Factors

Associations of Work Hours and Actual Availability of Weekly Rest Days with Cardiovascular Risk Factors

Long Work Hours and Obesity in Korean Adult Workers

21st International Symposium on Shiftwork and Working Time: The 24/7 Society – From chronobiology to practical life

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