No Jet Lag
Jet Lag can mean:
• Lack of concentration and motivation
• Broken sleep after travel
• Discomfort of legs and feet
What causes jet lag?
It hardly seems possible that so many problems could result from merely traveling in an aircraft, but as the survey of flight attendants shows, it affects even the professionals. It is worse for passengers, partly because they are confined in their seats for long periods in flight.
The greatest cause of jet lag is rapid transit across world time zones. The time difference disrupts our body clock (circadian rhythm). This in turn affects body temperature, heartbeat, blood pressure and physiological patterns, leading to disorientation and mental and physical fatigue.
Sitting still for long periods in flight causes discomfort and possible swelling of the legs and feet, and the dry atmosphere in airliner cabins can cause body dehydration. Altitude and pressure changes at each landing and takeoff also upset body systems, and although airliner cabins are pressurized, these changes are a significant cause of jet lag.
The effects of jet lag may be made worse by excessive eating and consumption of alcohol in flight, by loss of sleep, and also by being tired or not in good condition before the flight, although these are not specifically causes of jet lag.