Long working hours may raise the risk of mental decline and possibly dementia, research suggests
The study found that those working more than 55 hours a week had poorer mental skills than those who worked a standard working week.
Lead researcher Dr Marianna Virtanen, from the Finnish Institute of Occupational Health, said: "The disadvantages of overtime work should be taken seriously."
Lead researcher Dr Marianna Virtanen, from the Finnish Institute of Occupational Health, said: "The disadvantages of overtime work should be taken seriously."
It is not known why working long hours might have an adverse effect on the brain. However, the researchers say key factors could include increased sleeping problems, depression, an unhealthy lifestyle and a raised risk of cardiovascular disease, possibly linked to stress. The effects were cumulative, the longer the working week was the worse the test results were. Employees with long working hours also had shorter sleeping hours, reported more symptoms of depression and used more alcohol than those with normal working hours.
Professor Mika Kivimäki said "It is particularly important to examine whether the effects are long-lasting and whether long working hours predict more serious conditions such as dementia."
Professor Cary Cooper, an expert in workplace stress at the University of Lancaster, said it had been long established that consistently working long hours was bad for general health, and now this study suggested it was also bad for mental functioning.
"But my worry is that in a recession people will actually work longer hours. There will be a culture of "presenteeism" - people will go to work even if they are ill because they want to show commitment, and make sure they are not the next to be made redundant."
Harriet Millward, deputy chief executive of the Alzheimer's Research Trust, said: "This study should give pause for thought to workaholics..."
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