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Lost Hour of Sleep Over Weekend May Put Heart at Risk Monday

Expert warns of 10% increase in heart attack risk among those who don't prepare for lost sleep

THURSDAY, March 8 (HealthDay News) -- Not only do you lose an hour of sleep after the clocks move ahead to daylight-saving time this weekend, but you also may be at increased risk for a heart attack, a heart expert claims.

"The Monday and Tuesday after moving the clocks ahead ... is associated with a 10 percent increase in the risk of having a heart attack," Martin Young, an associate professor in the cardiovascular disease division at the University of Alabama at Birmingham, said in a university news release. "The opposite is true when falling back in October. This risk decreases by about 10 percent."

The heart-attack risk isn't higher on the Sunday morning after clocks move ahead one hour because most people don't have to make an abrupt change in their daily schedule. The risk peaks on Monday, when most people get up earlier to go to work, Young noted.

"Exactly why this happens is not known but there are several theories," Young said. "Sleep deprivation, the body's circadian clock and immune responses all can come into play when considering reasons that changing the time by an hour can be detrimental to someone's health."

Although the study uncovered an association between sleep loss and heart-attack risk, it did not prove a cause-and-effect relationship.

Young explained that people "who are sleep-deprived weigh more and are at an increased risk of developing diabetes or heart disease. Sleep deprivation also can alter other body processes, including inflammatory response, which can contribute to a heart attack. And your reaction to sleep deprivation and the time change also depends on whether you are a morning person or night owl. Night owls have a much more difficult time with 'springing forward.'"

Young also outlined the possible role of the circadian clock.

"Every cell in the body has its own clock that allows it to anticipate when something is going to happen and prepare for it," he said. "When there is a shift in one's environment, such as 'springing forward,' it takes a while for the cells to readjust."

The immune system also may play a role in the increased risk. "Immune cells have a clock, and the immune response depends greatly on the time of day," Young said.

Young offered tips for adapting to the time change:

  • Wake up 30 minutes earlier than normal on Saturday and Sunday to help prepare you for an early start on Monday.
  • Eat a healthy breakfast.
  • Head outside to catch some sunlight in the early morning.
  • Spend a few minutes getting some morning exercise over the weekend, as long as you don't have heart disease.

"Doing all of this will help reset both the central, or master, clock in the brain that reacts to changes in light/dark cycles, and the peripheral clocks -- the ones everywhere else including the one in the heart -- that react to food intake and physical activity," Young said. "This will enable your body to naturally sync with the change in the environment, which may lessen your chance of adverse health issues on Monday."

More information

The U.S. National Institute of General Medical Sciences has more about circadian rhythms.


SOURCE: University of Alabama at Birmingham, news release, March 7, 2012

Copyright © 2012 HealthDay. All rights reserved.

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