Although aircraft cabins are pressurized, cabin air pressure at cruising altitude is lower than air pressure at sea level. At a typical cruising altitude of 11 000 metres (37 000 feet), air pressure in the cabin is equivalent to that at an altitude of 1500?500 metres (5000?000 feet) above sea level.
As a consequence, the available oxygen is reduced and gases within the body expand why it is recommended to:
Drink non -carbonic acid beverages
drink extra non-alcoholic caffeine-free beverages before and during your flight to avoid dehydration.
Prolonged immobility, particularly when the individual is seated, leads to pooling of blood in the legs, which in turn causes swelling, stiffness, and discomfort. Circulatory stasis is a predisposing factor for the development of venous thrombosis (blood clots). Flex thoroughly when you are awake.
Extend your legs straight out in front of you and flex your ankles, pulling up and spreading your toes, then pushing down and curling the toes. If your shoes limit toe movement, just make the effort and don't worry, or remove the shoes.
If there isn't room to extend your legs, start with your feet flat on the floor and push down and curl your toes while lifting your heels from the floor. Then, with your heels back on the floor, lift and spread your toes. Repeat this heel - toe cycle ten times.
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