Sleep Disorders

13 February 2007

Siestas protect the heart

A large study of Greek men and women suggests that taking a daily midday nap may reduce your risk of dying from heart disease by more than 30 percent.

A large study of Greek men and women suggests that taking a daily midday nap may reduce your risk of dying from heart disease by more than 30 percent.

Siestas are common in Mediterranean countries and several Latin American nations, and in these countries, the rate of dying from heart disease is comparatively low. Earlier studies had looked at the association between midday naps and heart disease, but the results were inconsistent. The new study is the first large, prospective study of people who were healthy at the start of the study, and it's also the first one to take into account risk factors, such as diet and exercise.

A considerable benefit
"If you have a siesta, it conveys a benefit against coronary mortality, which is considerable," said senior author Dr Dimitrios Trichopoulos, a professor of cancer prevention and epidemiology at the Harvard School of Public Health.

"This is a simple habit, that if you adhere to it, you may get a benefit against the most important cause of mortality," Trichopoulos added. "For those of you accustomed to having a siesta - keep doing it. For the rest, wait to see additional studies, and if they confirm these findings, then you may really have to consider changing your lifestyle."

The results are published in the February 12 issue of the Archives of Internal Medicine.

For the study, Trichopoulos's team collected data on 23 681 people in Greece. At the beginning of the study, none had a history of heart disease, stroke or cancer. The researchers followed these people for an average of 6.3 years.

37% reduced risk
They found that people who regularly took a midday nap at least three times a week for an average of at least 30 minutes had a 37 percent lower risk of dying from heart disease, compared with people who didn't nap.

People who napped occasionally had a non-significant 12 percent reduction in their risk of dying from heart disease.

The apparent protective effect of siestas was particularly strong among men who worked, and was weaker among men who didn't, mainly retirees. Whether women also had the same benefit from a nap couldn't be determined from the data in this study, the researchers noted.

A way to relieve stress
Trichopoulos believes that naps are a way to relieve stress. "We know there are all sorts of physiological phenomena associated with sleep," he said. "But because sleep is such an important factor for cardiac mortality, it might have a simple stress-relieving impact," he said.

The finding is potentially important, Trichopoulos said, but he added, "We are not telling everyone they should go home and have a siesta."

One heart expert said he was sceptical about the study's findings.

"In this study, there were numerous well-established and modifiable cardiovascular risk factors, such as blood pressure and LDL ("bad") cholesterol levels which were not measured and thus could not be adjusted for," said Dr Gregg C. Fonarow, a professor of cardiology at the University of California, Los Angeles.

These factors may be the reason for the lower rates of death from heart disease, he said.

"Before siestas could be recommended as a means of lowering cardiovascular risk, these findings would need to be confirmed in a large-scale, randomised, controlled trial," Fonarow said. "Individuals wanting to lower their cardiovascular risk should stick to what has been proven to be effective: Don't smoke, get regular exercise, and maintain healthy blood pressure, weight, and cholesterol levels." – (HealthDayNews)

Read more:
Sleep Centre
Heart Centre

February 2007


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Dr Alison Bentley is a general practitioner who has consulted in sleep medicine and sleep disorders, in both adults and children of all ages, for almost 30 years. She also researches and publishes on a number of sleep-related topics both in formal research journals and lay publications including as editor of Sleep Matters, an educational newsletter on sleep disorders for doctors.

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