Written by Professor Sunao Uchida, Faculty of Sports Sciences, Waseda University
With the internationalization of athletic endeavor in recent years, our faculty research unit has come up with a way of conquering jet lag. When sudden travel by aircraft to different time zones leaves athletes feeling drowsy and lethargic ahead of competition, it is hard to expect much from their performance.
So, to be able to supplement athlete’s fortitude and help them overcome this challenge is a great thrill for the field of sports science, and our methods have proved successful in conquering the jet lag of Olympic athletes. Yet, there is little doubt that in addition to athletes, this knowhow is also applicable to businessmen in the course of their hurried trips back and forth. Let's take a look at this approach to conquering jet lag.
Westbound and Eastbound Flights
Let's consider three instances of air travel abroad: to Europe, the U.S. and Australia. Flights from Japan to Europe are westbound, while flights to America and Australia take eastbound and southbound routes, respectively. Although the amount of fatigue experienced inside the plane is similar for flights of roughly the same duration, the amount of jet lag varies considerably. Clearly, with only a slight time difference involved for travel to Australia there is little or no jet lag, and in many cases, the two-hour time difference is not felt at all.
Flights to Europe are westbound while travel to the United States takes an eastbound course, but which direction results in greater jet lag? The answer, as many of you will know from experience, is eastbound flights. This will become clear if we consider travel to zones which have an eight-hour time difference. Ignoring the international date line, this means that with noon as our starting point in Japan, it is eight o'clock in the evening (eight hours ahead) in the eastbound zone and four o'clock in the morning (eight hours behind) in the westbound zone. This leads to the scenario where passengers on a flight eastbound to a zone with an eight-hour time difference and a local time of eleven o'clock at night are faced with trying to sleep at three o' clock in the afternoon Japan time. Clearly, with our body clocks locked onto the Japanese time of three in the afternoon, it is hard to sleep well, no matter how much we might want to. Then, at the end of six hours weary travelling in the dark, dawn breaks at around five in the morning local time and it is time to get up while our body clock, set to Japan time and still thinking that it is nine at night, makes us feel sleepy. This eastbound flight means that when it gets to eleven at night (Japan standard time) it is actually seven in the morning locally and we must get to work at a time when our bodies are ready for sleep. Westbound flights, on the other hand, are quite comfortable since a local time of eleven in the evening on westbound flights is seven in the morning in Japan, and with the usual tiredness of the journey, passengers fall asleep by around nine that evening. Since this equates to five in the morning in Japan, this is comparable to sleeping after staying up as late as possible into the night. This often results in waking up early, something socially desirable for those who have stayed up late and are used to getting up and going to bed early.
How to Conquer Eastbound Flights
So, how can we overcome the jet lag of eastbound flights? The first thing to be done is adjust the body as much as possible to the local time zone prior to the day of departure. While this may be hard for some businessmen, getting up and going to bed early is the key to this approach. Ideally, someone who usually rises at seven will get up an hour earlier each day until he or she gets up at three or four in the morning. Exposure to bright (high illumination) light is a way to make this more effective and the method involves exposure to strong light of over 2,000 lux for about an hour as soon as you get up. While some fluorescent lights may be used, since most lamps inside the home do not put out 2,000 lux of light, special phototherapy devices are recommended. You can learn more by searching on the internet with the key words "light therapy." As the time to rise every day is brought forward, so is the time to bathe in the light, and the early morning light acts to re-set your body's internal clock and bring that forward, too. So, there is a marked difference in the effect brought about by exposure to light after early rising compared with that obtained from just getting up early.
How to Spend Time on the Plane
How you spend time on the plane is also a factor. Most planes to the West Coast are evening departures, which means that they arrive in the morning. So here are some tips on how to spend your time on board.·Set your watch to the local time before you leave the airport
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