WEDNESDAY, December 1 (Health.com) — People who snore loudly, have difficulty falling asleep, or often wake up feeling tired may have more to worry about than dozing off at work. A new study suggests they may also be at increased risk of developing heart disease and other health problems down the road.
In the study, researchers at the University of Pittsburgh asked more than 800 people between the ages of 45 and 74 about the quality of their sleep. Three years later, the people who reported snoring loudly were more than twice as likely as quiet sleepers to have metabolic syndrome—a cluster of risk factors for heart disease, diabetes, and stroke that includes high blood pressure, high blood sugar, low “good” cholesterol, high triglycerides, and excess belly fat.
People who had trouble falling asleep or who woke up feeling unrefreshed at least three times per week were about 80% and 70% more likely than their peers, respectively, to develop three or more of those risk factors, the study found. (A person must have three of the five risk factors to be diagnosed with metabolic syndrome.)
Sleep problems are “a big deal,” says Jordan Josephson, MD, an ear, nose, and throat specialist at Lenox Hill Hospital, in New York City. “They’re bad for the heart, bad for diabetes, and they lead to heart attacks and stroke.… It’s going to shorten your life.” (Dr. Josephson was not involved in the new research.)
Overall, 14% of the study participants developed metabolic syndrome. African Americans were more susceptible than whites, as were sedentary people compared to those who were physically active.
The findings, which appear in the journal Sleep, echo previous studies that have shown a link between sleep difficulties and health problems such as obesity and high blood pressure. But this is the first study to follow people with sleep problems over time to see if they develop metabolic syndrome, according to the authors.
Virend Somers, MD, a professor of medicine at the Mayo Clinic, in Rochester, Minn., says that sleep deprivation is an “epidemic” that is “almost in parallel” with the obesity epidemic and the widespread rise of risk factors for heart disease and diabetes. The links between obesity and metabolic syndrome are well known, but the role that sleep plays has been less clear, Dr. Somers says.
Next page: How does sleep affect heart health?