Impact of Long Working Hours on Health
Study Overview
Working extended hours may negatively affect sleep and overall health. A recent study examined the potential link between long working hours and an increased risk of heart disease and high blood pressure. Prolonged work periods can elevate stress levels, often resulting in reduced time for sleep, leisure activities, and exercise. While numerous studies have suggested that long working hours could pose health risks, including stroke and heart disease, some research has not found a significant correlation between working hours and health issues.
Potential Benefits and Variability
It’s important to note that the advantages of longer working hours, such as enhanced financial security, might mitigate some adverse health effects. Additionally, variations in work culture and health outcomes between countries could influence results. A recent study conducted in Denmark focused on whether long working hours are linked to an increased risk of hypertension and heart disease, with results published in the journal BMJ Open.
Danish Labour Force Survey
Methodology
The Danish government conducts an annual national survey to assess typical working hours in the country. Researchers analyzed survey results from 1999 to 2013, focusing on respondents aged 21 to 59 who reported working between 32 and 100 hours per week. To ensure accurate findings, individuals with pre-existing conditions of high blood pressure or heart disease at the time of the survey were excluded. This resulted in a study population of over 125,000 adults.
Data Collection
The researchers utilized national medical records to track the health outcomes of the surveyed employees, specifically looking for cases of heart disease and high blood pressure that developed after the survey.
Findings on Health Risks
Survey Results
Among the surveyed employees, over 80% reported working between 32 to 40 hours a week, while only 6% worked more than 48 hours. Following the survey, more than 3,500 participants were diagnosed with heart disease, and over 20,000 developed high blood pressure. Notably, these conditions were not more prevalent among those working longer hours.
Socioeconomic and Demographic Analysis
The study further categorized participants by socioeconomic status, work schedule (day or night), and gender. The findings indicated that none of these variables significantly impacted the risk of developing heart disease or high blood pressure associated with extended work hours. There was, however, a minor trend suggesting an increased risk of heart disease among low socioeconomic workers who logged very long hours, though the small sample size made these results inconclusive.
Generalizability of Findings
Study Scope and Limitations
This extensive study, involving over 100,000 individuals, is the largest of its kind to evaluate the relationship between working hours and heart disease. It drew on comprehensive national surveys and health registries, enhancing data accuracy. However, the findings may not be applicable to all countries, as most Danish employees reported working 40 hours or less, and other nations might face different social and economic dynamics that lead to longer working hours.
Need for Further Research
Further investigation is warranted, especially regarding low socioeconomic workers who engage in very long hours. Despite the limitations, the study did not provide substantial evidence that long working hours in Denmark correlate with an increased risk of heart disease.
Reference
Hannerz, H., Larsen, A. D. & Garde, A. H. Long weekly working hours and ischaemic heart disease: A follow-up study among 145,861 randomly selected workers in Denmark. BMJ Open 8 (2018). http://bmjopen.bmj.com/content/8/6/e019807