Reduced air pressure and oxygen levels on planes do not increase the risk of blood clots in the legs, a recent study is suggesting.Prior research suggested air passengers are at an increased risk of DVT because of the unique conditions of air travel.

But Leicester and Aberdeen university researchers have now said that sitting for long periods was the main cause, and warned people of this danger during all forms of travel.

The study of 73 people has been featured in the Journal of the American Medical Association.

The studies lead researcher, Dr William Toff said: “Our study provides, for the first time, a carefully controlled assessment of the effects on blood clotting of the low air pressure and low oxygen level that might be found during a long-haul flight.

“We found no evidence that these conditions cause activation of the blood clotting mechanism.”
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