Australia’sexerciseguidelineshaverecentlycomeasashoc...

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Australia’s exercise guidelines have recently come as a shock to us. Not only are we being told we need to do a lot of more physical activity, but we’re also being urged to get out of our chairs----even if we do the right amount of exercise.

The new guidelines focus not just on the exercise but on the amount of time we spend being sedentary(惯于久坐不动的). Sedentary behavior is the term to describe physically inactive tasks that don’t require lots of energy, basically sitting or sleeping. Activities are often measured in METs (Metabolic Equivalent of Task). Sedentary activities are in between 1 and 1.5 METs, walking at a moderate pace ranges from 3 to 3.5 and jogging is about 7.

In recent years, a growing body of research has linked sedentary behaviour to obesity, type 2 diabetes, heart disease, some cancers. It’s considered such a risk that one US expert has gone so far as to suggest sitting for most of the day may be as dangerous to your health as smoking.

Experts state we’re sedentary on average for 7 to 10 hours a day (this doesn’t include our time spent sleeping). Even if you are meeting, or exceeding (超过), the recommended 60 minutes a day of physical activity, you can still be considered sedentary.

The guidelines don’t make any specific suggestions about how long you should sit for. Instead they say we should “minimize the amount of time spent in prolonged sitting” and “to break up long periods of sitting as often as possible. ”

28. From the passage we know that ___________.

A. sedentary behavior is as dangerous to health as smoking

B. sedentary behavior is likely to lead to some cancers

C. we are sedentary for 7-10 hours a day in total

D. we are healthy if we take one-hour physical activity a day.

29. Which way of behavior does the new guidelines advocate ?

A. Stand up or take a short walk between sittings

B. Exercise less than 60 minutes a day

C. Shorten the time of sleeping

D. Stand for a long time a day

30. Where does this passage probably come from?

A. Science fiction B. A scientific paper