I like to check out Google News every morning, and I'm especially interested in their Health section. Today there were two headlines that caught my attention, and each turned out to be totally misleading.
Do you feel safer now, as you prepare for your long flight? Do you think you can relax, forget about periodically wiggling your toes, stretching your feet, and disturbing your seatmates so you can get up and walk around? Not so fast! What the article says is that low cabin pressure and reduced oxygen do not increase the risk of blood clots. The damage is done by reduced circulation caused by long periods of inactivity, whether on plane, train, bus, or car. Although the article does not address this issue, I'm guessing sitting at a desk all day isn't a good situation, either.
Considering the relative leg room offered by the other modes of transportation, it's not surprising that the problem appears more often among those who fly. To give the casual reader the impression that he's safe from bloodclots on a long flight is misleading and dangerous.