Both Too Little and Too Much Sleep Bad for the Heart:
SUNDAY, March 25 (HealthDay News) -- When it comes to what's
best for their hearts, people walk a fine line between getting too
much and too little sleep, a new study suggests.
Adults who get fewer than six hours or more than eight hours of
sleep a night are at greater risk for a variety of heart
conditions, according to research led by Dr. Rohit Arora, chairman
of cardiology at the Chicago Medical School.
Sleeping too little puts people at significantly higher risk of
stroke, heart attack and congestive heart failure, the researchers
found. On the other hand, people who sleep too much have a higher
prevalence of chest pain (angina) and coronary artery disease, a
narrowing of the blood vessels that supply the heart with blood and
The findings are scheduled for presentation Sunday at the
American College of Cardiology annual meeting in Chicago.
The researchers analyzed data from more than 3,000 patients over
age 45 who participated in the U.S. National Health and Nutrition
Examination Survey, making theirs the first nationally
representative sample to show the association between sleep
duration and heart health.
The study showed that people who got too little sleep were twice
as likely to have a stroke or heart attack and 1.6 times more
likely to have congestive heart failure. People who slept more than
eight hours a night were twice as likely to have angina and 1.1
times more likely to have coronary artery disease.
The findings remained significant even after the researchers
accounted for heart risk factors such as age, blood cholesterol
levels, smoking and obesity, as well as for sleep apnea and other
Previous studies have shown that insufficient sleep is linked to
a hyperactive nervous system, glucose intolerance, diabetes,
inflammation and a rise in stress hormones, blood pressure and
resting heart rate, the researchers noted.
The reasons too much sleep can lead to heart problems are
unclear, however, and further research will be needed.
For now, Arora said, health-care providers need to talk about
sleep with their patients.
"Clinicians need to start asking patients about sleep, especially those who are already at greater risk of heart disease," he said. "It's really a simple thing to assess as part of a physical exam; it doesn't cost anything and it may help patients to adopt better sleep habits."
Although the new study uncovered an association between sleep
issues and heart trouble, it did not prove a cause-and-effect
Research presented at medical meetings should be viewed as
preliminary until it is published in a peer-reviewed medical
The National Sleep Foundation has more on
getting a good night's sleep.
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