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

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.

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