People who sit for hours on desks or watch television need to exercise for more than 30 minutes a day to avoid health risks, according to an Australian study released yesterday.
The study, conducted by the University of Sydney, found that people who sit more than six hours a day without exercise have a higher risk of dying from cardiovascular disease than those who exercise for an hour a day. The study, published in the Journal of the American College of Cardiology, included a sample of 150,000 people over the age of 45 and nine years.
The average Australian worker spends more than six hours a day sitting, and the researchers classify them as "sitting for long periods". High sitting time was associated with health problems, including cancer, obesity, heart disease, diabetes, and even depression. It turns out that standing lowers the risk of cardiovascular disease, for those who sit four hours a day or less, but it has limited impact for those who sit longer.
Those who sit for long periods of time and practice moderate exercises of 20 to 40 minutes a day, such as walking or climbing the stairs, have a significantly lower health risk.
"In our study, sitting time was consistent with early deaths and cardiovascular mortality in less physically active groups," said Professor Emmanuel Stamatakis, lead author of the study.
For example, people who were physically inactive and sat for more than eight hours a day were 107 percent more likely to die of cardiovascular disease than those who had been physically active for at least one hour a day and sat for less than four hours. "Any healthy movement," Stamatakis said, noting that intense physical activity is the most effective.
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