DVT is the formation of blood clots in the legs. Prolonged inactivity can be a factor and it has been linked to cramped conditions during air travel. The US government's Aviation Health Unit offers this advice:
- All of us should exercise the calf muscles regularly, drink enough water, but avoid alcohol and coffee.
- Minor risk (If you have any of these factors: age over 40; very tall, short or obese; history of leg swelling; recent minor surgery or extensive varicose veins.) Do not sleep for long periods or take sleeping pills.
- Moderate risk (Recent heart disease; pregnant; on the Pill or HRT family history of DVT.) Take a doctor's advice about travel. You may need special stockings known as "graduated compression stockings" to prevent DVT.
- High risk (Recent major surgery, stroke or leg injury, known clotting tendency.) Take medical advice. You may need blood-thinning medication.
And here's a video by NewYouLifestyle on DVT.
You can buy graduated compression stockings to prevent DVT here or here.
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