Working long hours is killing hundreds of thousands of people a year in a worsening trend, according to the World health organisation – and Australia is part of the region worst affected.

In the first global study of the loss of life associated with longer working hours, the paper in the journal Environment International showed that 745,000 people died from stroke and heart disease associated with long working hours in 2016.

Research shows there is a link between working more than 55 hours a week and health problems later in life.

That was an increase of nearly 30 percent from 2000. And researchers believe that the COVID-19 pandemic may accelerate the problem further.

“Working 55 hours or more per week is a serious health hazard,” said Maria Neira, director of the WHO’s Department of Environment, Climate Change and Health.

“What we want to do with this information is promote more action, more protection of workers,” she said.

The joint study, produced by the WHO and the International Labour Organisation, showed that most victims (72 per cent) were men and were middle-aged or older. Often, the deaths occurred much later in life, sometimes decades later, than the shifts worked.

It also showed that people living in south-east Asia and the western Pacific region – a WHO-defined region which includes China, Japan and Australia – were the most affected.

Overall, the study – drawing on data from 194 countries – found that working 55 hours or more a week is associated with a 35 per cent higher risk of stroke and a 17 per cent higher risk of dying from ischemic heart disease, compared with a 35-40 hour working week.

The study covered the period 2000-2016, and so did not include the COVID-19 pandemic, but WHO officials said the surge in remote working and the global economic slowdown resulting from the coronavirus emergency may have increased the risks.