The Canadian Press - ONLINE EDITION

Researchers say math can customize most effective route to recovery from jet lag

  • Print

WASHINGTON - Lots of apps claim they can help you fight jet lag. Now Michigan researchers say mathematical formulas suggest it's possible to adjust to new time zones a bit faster than previously thought, and they created their own free app to help.

Doctors have long said exposure to light is key. But how much, and when?

"If you get light in the wrong time or wrong way, it'll send you the wrong direction," said University of Michigan math professor Daniel Forger, who led the research published Thursday.

A master biological clock, called a circadian rhythm, regulates when we become sleepy and when we're more alert. Travel across time zones and the body clock has to reset itself.

Light is that clock's strongest regulator. In a study partly funded by the Air Force, the Michigan team used two equations proven to predict someone's circadian rhythm, and with computer modeling calculated different schedules of light exposure for more than 1,000 possible trips.

It's possible to customize a block of time each day when you should be in light, the brighter the better, and another when you should avoid it, Forger's team reported in the journal PLoS Computational Biology. (It didn't address other potential remedies such as melatonin.)

An example: Fly from Detroit to London, five hours ahead, arriving at 11 a.m. London time. Generally, it's thought to take a day per time zone to fully adjust. But the study suggests a three-day adjustment schedule, if you can stick with it: On the day after arrival, get light from 7:40 a.m. to 9 p.m.; from 6:20 a.m. to 7:40 p.m. on Day 2; and from 5 a.m. until 7:20 p.m. on Day 3.

A free iPhone app named Entrain does the calculations. Stay indoors, or stay up later, and it adjusts the advice.

The app hasn't been tested with travellers to see whether it really helps more than general advice, such as to seek morning light when travelling eastward. But after using it, travellers will be given a choice of submitting their data to a University of Michigan study.

"Before we really believe it, it has to go through testing," cautioned sleep-medicine specialist Dr. Steven Altchuler, an assistant professor of psychiatry at the Mayo Clinic College of Medicine, who wasn't involved in the project. But "there's very little risk of harm if someone wants to try these things."

Most people adjust fine with general advice, but adjusting faster may be more important if travellers must be at their best for, say, sports competitions or a business negotiation, Altchuler added.

"I think it makes sense," said Dr. Charles Bae of the Cleveland Clinic's sleep disorder centre. "Anything you could do to optimize your adjustment is welcome, without medications."

Fact Check

Fact Check

Have you found an error, or know of something we’ve missed in one of our stories?
Please use the form below and let us know.

* Required
  • Please post the headline of the story or the title of the video with the error.

  • Please post exactly what was wrong with the story.

  • Please indicate your source for the correct information.

  • Yes

    No

  • This will only be used to contact you if we have a question about your submission, it will not be used to identify you or be published.

  • Cancel

Having problems with the form?

Contact Us Directly
  • Print

You can comment on most stories on winnipegfreepress.com. You can also agree or disagree with other comments. All you need to do is be a Winnipeg Free Press print or e-edition subscriber to join the conversation and give your feedback.

You can comment on most stories on winnipegfreepress.com. You can also agree or disagree with other comments. All you need to do is be a Winnipeg Free Press print or e-edition subscriber to join the conversation and give your feedback.

Have Your Say

New to commenting? Check out our Frequently Asked Questions.

Have Your Say

Comments are open to Winnipeg Free Press print or e-edition subscribers only. why?

Have Your Say

Comments are open to Winnipeg Free Press Subscribers only. why?

The Winnipeg Free Press does not necessarily endorse any of the views posted. By submitting your comment, you agree to our Terms and Conditions. These terms were revised effective April 16, 2010.

letters

Make text: Larger | Smaller

LATEST VIDEO

Maria Aragon performs new single "Nothing but a Beat"

View more like this

Photo Store Gallery

  • Young goslings are growing up quickly near Cresent Lake in Portage La Prairie, Manitoba- See Bryksa 30 Day goose project- Day 11- May 15, 2012   (JOE BRYKSA / WINNIPEG FREE PRESS)
  • Marc Gallant / Winnipeg Free Press. Local- Deer in Canola field near Elma, Manitoba. 060706.

View More Gallery Photos

Poll

Should panhandling at intersections be banned?

View Results

View Related Story

Ads by Google