Entrain: the free app that could help beat jetlag

Updated: 2014-04-11
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The researchers say exposure to light is the key to beating jet lag - and built a free app to tell people how to do it
Michigan researchers say mathematical formulas suggest it is possible to adjust to new time zones far faster than previously thought.

Doctors have long said exposure to light is key, but admit that working out how to best adapt is complex.

'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 and created a free app to help. 
The app uses a newly developed formula to help people cut days off their jetlag by suggesting 'chunks' of time to be in the light that will help them adapt more quickly.
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. 
The researchers gave the example of a person flying from the US to the UK. 
'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. 
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 travelers to see whether it really helps more than general advice, such as to seek morning light when traveling eastward.

But after using it, travelers 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 travelers 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 center. 
'Anything you could do to optimize your adjustment is welcome, without medications.' 
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