People who sleep more than eight hours a day, have an increased risk of stroke. These are the conclusions of researchers from the Department of Public Health and Primary Care, University of Cambridge. The results of their work are published in the journal Neurology.
As part of the European Prospective Investigation into Cancer (EPIC), Norfolk Cohort Scientists for 9, 5 years was observed for 10,000 people aged 42 to 81 years. All volunteers are regularly reported to the researchers, how many hours a day they sleep. Seven out of ten participants in the study were isolated from sleep 6 to 8 hours per day, whereas every tenth slept more than eight hours.
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During the 10 years before the study lasted 346 participants had a stroke. After adjustment for various factors such as age and sex, the researchers found that people who slept more than 8 hours per day had a risk of stroke by 46% higher than the rest.
While older people have less work and social responsibilities, which means they have the opportunity to sleep longer, previous studies have shown that, in fact, on the sleep they need less time than the young and mature people.
The researchers noted that I have not yet clear what the relationship between sleep and stroke risk. It is known that lack of sleep leads to metabolic disorders and improve the stress hormone, cortisol, which in turn is fraught with high blood pressure and increased risk of stroke. However, as suggested by the present study, the relationship between the long bed and the risk of stroke does not depend on the usual factors of cardiovascular diseases.
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Professor Kay-Tee Khao, lead author of the study, said: “We need to understand the reasons underlying the connection between sleep and stroke risk. What happens in the body that causes this relationship? In further studies, we find that excessive sleep is an early indicator of increased risk of stroke, especially among the elderly.”
Source: Yue Leng, Francesco P. Cappuccio, Nick WJ Wainwright, Paul G. Surtees, Robert Luben, Carol Brayne, and Kay-Tee Khaw. Sleep duration and Risk of fatal and nonfatal Stroke: A Prospective STUDY and META-analysis.