Sitting in economy class on a long flight doesn�t put you at higher risk of blood clots.

But sitting next to the window might.

That�s the finding of a new study on deep-vein thrombosis � clots that form in leg veins and can kill if they travel to the lungs.

The condition has been dubbed �economy class syndrome� based on the theory that the lack of leg room in the back of a plane might be a factor.

But researchers from the American College of Chest Physicians said whether passengers fly coach or roomier first-class doesn�t make a difference.

The real cause is not moving around during a long-haul voyage. Sitting next to the window seems to keep people in their seats because they�re reluctant to disturb their row mates.

The doctors note that most healthy people don�t have to worry about the clots. The risk of developing one on a long flight is only about 1 in 500.

They recommend taking a walk down the aisle every hour or two and flexing and extending the ankles while seated.

(Source: NY Daily News)