Annals of Occupational and Environmental Medicine

Research Article

Relationship between long work hours and self-reported sleep disorders of non-shift daytime wage workers in South Korea: data from the 5th Korean Working Conditions Survey: Hongsuk Choi, Sungho Lee, Man-Joong Jeon, Young-Sun Min; Ann Occup Environ Med 2020;32:e35. Published online November 3, 2020; DOI: https://doi.org/10.35371/aoem.2020.32.e35

Background

Studies have investigated the relationship between long work hours and sleep disorders; however, they have focused on shift workers or specific workers who are at high risk of industrial accidents rather than wage workers in general. The purpose of this study is to investigate the effects of long work hours on sleep disorders among non-shift daytime wage workers.

Methods

We conducted a secondary analysis of data from the 5th Korean Working Conditions Survey. From the 50,205 total participants, we included 26,522 non-shift daytime wage workers after excluding self-employed people, business owners, unpaid family employees, and wage workers who work nights and shifts. Sleep disorders were categorized into “difficulty in falling asleep,” “frequent waking,” and “waking up with fatigue.” Logistic regression analysis was used to evaluate the influence of long work hours on sleep disorders, and the odds ratios (ORs) were calculated.

Results

The OR of working > 52 hours per week was 1.183 (95% confidence interval [CI]: 1.002–1.394) for the risk of developing insomnia compared with working ≤ 40 hours per week. The OR of waking up with fatigue was 1.531 (95% CI: 1.302–1.801). Long work hours showed no significant relationship with difficulty in falling asleep or with frequent waking.

Conclusions

Working for extended hours was associated with increased fatigue upon waking in non-shift daytime wage workers.

Citations

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Review

Very Long (> 48 hours) Shifts and Cardiovascular Strain in Firefighters: a Theoretical Framework: BongKyoo Choi, Peter L Schnall, Marnie Dobson, Javier Garcia-Rivas, HyoungRyoul Kim, Frank Zaldivar, Leslie Israel, Dean Baker; Ann Occup Environ Med 2014;26:5-5. Published online March 6, 2014; DOI: https://doi.org/10.1186/2052-4374-26-5

Abstract PDF PubReader ePub

Shift work and overtime have been implicated as important work-related risk factors for cardiovascular disease (CVD). Many firefighters who contractually work on a 24-hr work schedule, often do overtime (additional 24-hr shifts) which can result in working multiple, consecutive 24-hr shifts. Very little research has been conducted on firefighters at work that examines the impact of performing consecutive 24-hr shifts on cardiovascular physiology. Also, there have been no standard field methods for assessing in firefighters the cardiovascular changes that result from 24-hr shifts, what we call “cardiovascular strain”. The objective of this study, as the first step toward elucidating the role of very long (> 48 hrs) shifts in the development of CVD in firefighters, is to develop and describe a theoretical framework for studying cardiovascular strain in firefighters on very long shifts (i.e., > 2 consecutive 24-hr shifts). The developed theoretical framework was built on an extensive literature review, our recently completed studies with firefighters in Southern California, e-mail and discussions with several firefighters on their experiences of consecutive shifts, and our recently conducted feasibility study in a small group of firefighters of several ambulatory cardiovascular strain biomarkers (heart rate, heart rate variability, blood pressure, salivary cortisol, and salivary C-reactive protein). The theoretical framework developed in this study will facilitate future field studies on consecutive 24-hr shifts and cardiovascular health in firefighters. Also it will increase our understanding of the mechanisms by which shift work or long work hours can affect CVD, particularly through CVD biological risk factors, and thereby inform policy about sustainable work and rest schedules for firefighters.

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Original Article

An Association between Working Schedules and Depression in Public Sector Employees: Hyeon Taek Heo, Dong Won Kim, Jong Seok Lee, Hyeon A Jo, Seong Sil Jang, Soo Young Kim, In Ah Kim; Korean Journal of Occupational and Environmental Medicine 2012;24(4):347-355. Published online December 31, 2012; DOI: https://doi.org/10.35371/kjoem.2012.24.4.347

Abstract PDF

OBJECTIVES
This study determined the work schedules of public project workers who work an irregular shift and assessed the effect of these schedules on depression.
METHODS
Study subjects were 2934 laborers who are members of seven labor unions. Each was given a questionnaire requesting basic personal information, habits, socioeconomic status, and work schedules. Information gathered on work schedules included daytime, nighttime, and weekend work hours. Depression was evaluated using the Beck Depression Inventory (BDI), with Laborers who checked "not depressed" and "slightly depressive" categorized to a low-risk group, whereas laborers who checked "depressed" and "severely depressed" were categorized to a high-risk group. We used the Chi-square test and multivariate logistic regression to examine associations between work schedules and depression.
RESULTS
Laborers on an irregular work schedule averaged 47.8 hours/week and laborers who working over 48 hours/week comprised over half (54.5%) of the total population. Laborers performing night work, Sunday work, and Saturday work more than once in a month made up 25.7%, 30.8% and 33.5% of the examined population, respectively. A high-risk for depression was identified in 10.4% of laborers. Using logistic regression, depression was statistically associated with working : over 10 hours a day (OR=1.63, 95% CI 1.10~2.43), night work (OR=2.20, 95% CI 1.46~3.32), Sunday work (OR=1.81, 95% CI 1.15~2.85) and Saturday work (OR=1.82 95% CI 1.18~2.82).
CONCLUSION
A significant number of laborers with irregular working shifts work long hours and on weekends. Depression was significantly associated with this type of work schedule.

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