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Medicineworld.org: Lack Of Sleep May Lead To High Blood Pressure

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Lack Of Sleep May Lead To High Blood Pressure

Lack Of Sleep May Lead To High Blood Pressure
If you're middle age and sleep five or less hours a night, you may be increasing your risk of developing high blood pressure, as per a research studyreleased by Columbia University's Mailman School of Public Health and the College of Physicians and Surgeons, and reported in Hypertension: Journal of the American Heart Association.

"Sleep allows the heart to slow down and blood pressure to drop for a significant part of the day," said James E. Gangwisch, PhD, lead author of the study and post-doctoral fellow in the psychiatric epidemiology training (PET) program at the Mailman School. "However, people who sleep for only short durations raise their average 24-hour blood pressure and heart rate. This may set up the cardiovascular system to operate at an elevated pressure".

Dr. Gangwisch said that 24 percent of people ages 32 to 59 who slept for five or fewer hours a night developed high blood pressure versus 12 percent of those who got seven or eight hours of sleep. Subjects who slept five or fewer hours per night continued to be significantly more likely to be diagnosed with high blood pressure after controlling for factors such as obesity, diabetes, physical activity, salt and alcohol consumption, smoking, depression, age, education, gender, and ethnicity.

The scientists conducted a longitudinal analysis of data from the Epidemiologic Follow-up Studies of the first National Health and Nutrition Examination Study (NHANES I). The analysis is based on NHANES I data from 4,810 people ages 32 to 86 who did not have hypertension at baseline. The 1982-84 follow-up survey asked participants how a number of hours they slept at night. During eight to 10 years of follow-up, 647 of the 4,810 participants were diagnosed with hypertension. Compared to people who slept seven or eight hours a night, people who slept five or fewer hours a night also exercised less and were more likely to have a higher body mass index. (BMI is a measurement used to assess body fatness). They were also more likely to have diabetes and depression, and to report daytime sleepiness.

"We had hypothesized that both BMI and a history of diabetes would mediate the relationship between sleep and blood pressure, and the results were consistent with this," Dr. Gangwisch said.

Sleep deprivation has been shown previously to increase appetite and compromise insulin sensitivity.

Short sleep duration was linked to a new diagnosis of hypertension among middle-aged participants, but the association was not observed among people age 60 or older, he said. Dr. Gangwisch said the differences between the younger and older subjects might be explained by the fact that advanced age is associated with difficulties falling and staying asleep. Another factor could be that subjects suffering from hypertension, diabetes, and obesity would be less likely to survive into their later years.

Among study limitations, scientists found that hypertension often goes undetected. An analysis of NHANES III data showed that over 30 percent of people who had hypertension didn't know they had it.

Since the study is based on observational data, Dr. Gangwisch said more research is needed to confirm the association between short sleep duration and high blood pressure. "We need to investigate the biological mechanisms and, if confirmed, design interventions that will help people modify sleep behavior," he said.

Dr. Gangwisch said the study's main message is clear: "A good night's sleep is very important for good health."



Posted by: Daniel    Source




Did you know?
If you're middle age and sleep five or less hours a night, you may be increasing your risk of developing high blood pressure, as per a research studyreleased by Columbia University's Mailman School of Public Health and the College of Physicians and Surgeons, and reported in Hypertension: Journal of the American Heart Association.

Medicineworld.org: Lack Of Sleep May Lead To High Blood Pressure

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