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Topic - Gordon Guyatt
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Sitting still for extended periods of time without using these muscles puts pressure on leg veins and blood "tends to sit there," which can increase chance for clots to form, said Guyatt, a researcher at McMaster University in Hamilton, Ontario.
Still, even on long flights, lasting at least four hours, the risk for most people is extremely low and not something to be alarmed about, said Dr. Gordon Guyatt, chairman of an American College of Chest Physicians' committee that wrote the new guidelines.