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Blood Flow in leg veins when sitting and standingThe previous pages explain the blood flow in the circulation at rest and when lying down. Of course, this explains the structure of the arterial and venous walls, and helps with much of the understanding of the circulation.
However you should be aware that research is suggesting that there is a difference between air travel and coach travel. It appears there is a higher risk of DVT in a flight than the same time sitting in a coach. This is probably due to the oxygen being "thinner" during a flight (most commercial aircraft are pressurised to 7,000 - 12,000 ft - so there is less oxygen in each breath than at ground level). This is obviously not the case in a coach. Nevertheless, as we try to stop DVT and "Economy class syndrome" or "Traveller's Thrombosis" by encouraging movement, compression socks (travel socks) and hydration, it is useful to understand the changes that occur when sitting.
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