INTRODUCTION

Picture
What is jet lag?

Jet lag, also called desynchronosis, is a temporary disorder that causes fatigue, insomnia, and other symptoms as a result of air travel across time zones.

What are other symptoms of jet lag?

Besides fatigue and insomnia, a jet lag sufferer may experience anxiety, constipation, diarrhoea, confusion, dehydrationheadache, irritability, nausea, sweating, coordination problems, and even memory loss. Some individuals report additional symptoms, such as heartbeat irregularities and increased susceptibility to illness.

What is a time zone?

A time zone is a geographical region which has the same time everywhere within it. The world has 24 time zones, one for each hour in the day. Each zone runs from north to south in strips that are approximately 1,000 miles (1,600 kilometers) wide. (The actual width of each zone varies to accommodate political and geographical boundaries.) As the earth rotates, dawn occurs at a set hour in one time zone, then an hour later in the time zone immediately to the west and so on through the 24-hour cycle. Thus, in the U.S., when it is 6 a.m. in the Eastern Time Zone, it is 5 a.m. in the Central Zone, 4 a.m. in the Mountain Zone, and 3 a.m. in the Pacific Zone.



Picture

MECHANISM

Picture
Why does jet lag occur?

The cause of jet lag is the inability of the body of a traveller to immediately adjust to the time in a different zone. Thus, when a New Yorker arrives in Paris at midnight Paris time, his or her body continues to operate on New York time. As the body struggles to cope with the new schedule, temporary insomnia, fatigue, irritability, and an impaired ability to concentrate may set in. The changed bathroom schedule may cause constipation or diarrhoea, and the brain may become confused and disoriented as it attempts to juggle schedules.

CURE

Picture
How does the body keep time?

A tiny part of the brain called the hypothalamus acts like an alarm clock to activate various body functions such as hunger, thirst, and sleep. It also regulates body temperature, blood pressure, and the level of hormones and glucose in the bloodstream. To help the body tell the time of day, fibres in the optic nerve of the eye transmit perceptions of light and darkness to a timekeeping centre within the hypothalamus. Thus, when the eye of an air traveller perceives dawn or dusk many hours earlier or later than usual, the hypothalamus may trigger activities that the rest of the body is not ready for, and jet lag occurs. 

What are the best ways to cope with jet lag?http://www.videojug.com/webvideo/how-to-overcome-jet-lagThe following are 12 tips to help travelers minimize the effects of jet lag.

Tip 1: Stay in shape

If you are in good physical condition, stay that way. In other words, long before you embark, continue to exercise, eat right, and get plenty of rest. Your physical stamina and conditioning will enable you to cope better after you land. If you are not physically fit, or have a poor diet, begin shaping up and eating right several weeks before your trip.

Tip 2: Get medical advice 

If you have a medical condition that requires monitoring (such as diabetes or heart disease), consult your physician well in advance of your departure to plan a coping strategy that includes medication schedules and doctor's appointments, if necessary, in the destination time zone.

Tip 3: Change your schedule 

If your stay in the destination time zone will last more than a few days, begin adjusting your body to the new time zone before you leave. For example, if you are traveling from the U.S. to Europe for a one-month vacation, set your daily routine back an hour or more three to four weeks before departure. Then, set it back another hour the following week and the week after that. Easing into the new schedule gradually in familiar surroundings will save your body the shock of adjusting all at once.

Tip 4: Avoid alcohol 

Do not drink alcoholic beverages the day before your flight, during your flight, or the day after your flight. These beverages can cause dehydration, disrupt sleeping schedules, and trigger nausea and general discomfort.

Tip 5: Avoid caffeine 

Likewise, do not drink caffeinated beverages before, during, or just after the flight. Caffeine can also cause dehydration and disrupt sleeping schedules. What's more, caffeine can jangle your nerves and intensify any travel anxiety you may already be feeling.

Tip 6: Drink water 

Drink plenty of water, especially during the flight, to counteract the effects of the dry atmosphere inside the plane. Consider taking your own water aboard the airplane if allowed.

Tip 7: Move around on the plane

While seated during your flight, exercise your legs from time to time. Move them up and down and back and forth. Bend your knees. Stand up and sit down. Every hour or two, get up and walk around. Do not take sleeping pills, and do not nap for more than an hour at a time.

These measures have a twofold purpose. First, they reduce your risk of developing a blood clot in the legs. Research shows that long periods of sitting can slow blood movement in and to the legs, thereby increasing the risk of a clot. The seat is partly to blame. It presses against the veins in the leg, restricting blood flow. Inactivity also plays a role. It decelerates the movement of blood through veins. If a clot forms, it sometimes breaks loose and travels to the lungs, lodges in an artery, and inhibits blood flow. The victim may experience pain and breathing problems and cough up blood. If the clot is large, the victim could die. Second, remaining active, even in a small way, revitalizes and refreshes your body, wards off stiffness, and promotes mental and physical acuity which can ease the symptoms of jet lag.

Tip 8: Break up your trip

On long flights traveling across eight, 10, or even 12 time zones, break up your trip, if feasible, with a stay in a city about halfway to your destination. For example, if you are traveling from New York to Bombay, India, schedule a stopover of a few days in Dublin or Paris. (At noon in New York, it is 5 p.m. in Dublin, 6 p.m. in Paris, and 10:30 p.m. in Bombay.)

Tip 9: Wear comfortable shoes and clothes 

On a long trip, how you feel is more important than how you look. So, wear comfortable clothes and shoes. Avoid items that pinch, restrict, or chafe. When selecting your trip outfit, keep in mind the climate in your destination time zone. Dress for your destination.

Tip 10: Check your accommodations 

Upon arrival, if you are staying at a hotel, check to see that beds and bathroom facilities are satisfactory and that cooling and heating systems are in good working order. If the room is unsuitable, ask for another.

Tip 11: Adapt to the local schedule 

The sooner you adapt to the local schedule, the quicker your body will adjust. Therefore, if you arrive at noon local time (but 6 a.m. your time), eat lunch, not breakfast. During the day, expose your body to sunlight by taking walks or sitting in outdoor cafes. The sunlight will cue your hypothalamus to reduce the production of sleep-inducing melatonin during the day, thereby initiating the process of resetting your internal clock.

Tip 12: Use sleeping medications wisely—or not at all 

Try to establish sleeping patterns without resorting to pills. However, if you have difficulty sleeping on the first two or three nights, it's okay to take a mild sedative if your physician has prescribed one. But wean yourself off the sedative as soon as possible. Otherwise, it could become habit-forming.