Late Bedtimes Linked to Heart Disease
Men who Turn In After Midnight Show Early Signs of Atherosclerosis
March 30, 2009 (Orlando) -- Burning the midnight oil may be hazardous to your health.
Men who go to bed after midnight have significantly more arterial stiffening -- an early stage of atherosclerosis, or hardening of the arteries -- than men who turn in earlier, a new study shows.
Several large studies have linked chronic sleep loss to heart disease, diabetes, obesity, and other health problems, says Yu Misao, MD, of the Misao Health Clinic in Gifu, Japan.
But whether bedtimes also have an influence on heart health has not been explored, he tells WebMD.
So Misao and colleagues put that question to the test in a study of 251 healthy men 60 and younger. They had an annual checkup, during which their blood pressure, body weight, body mass index (BMI), waist circumference, and lipid levels were measured.
Brachial-anklepulse wave velocity was used to examine the men for evidence of arterial stiffening. This measures how fast blood is rushing between the brachial artery in the arm and the tibial artery in the ankle. When blood pressure is high, blood flow accelerates, and the arterial walls stiffen.
All the participants filled out questionnaires that asked how many hours of sleep they got each night (six hours and 20 minutes, on average) and what time they went to bed (11:30 p.m. on average).
The fewer hours a man slept each night, the higher his BMI, blood pressure, and triglyceride levels, the study showed.
“This is consistent with previous reports showing that short sleep duration may negatively affect cardiovascular risk factors, Misao says.
There was no significant relationship between how many hours a man slept and arterial stiffness.
The men were then divided put into three groups according to the number of hours they reported sleeping at night: less than six hours, six to seven hours, and seven hours or more.
In each of these groups, the men who reported going to bed before midnight had more relaxed arteries, as shown by significantly lower brachial-ankle pulse wave velocity levels, than the men who went to bed after midnight.
Late Bedtimes Linked to Heart Disease
Men who Turn In After Midnight Show Early Signs of Atherosclerosis
March 30, 2009 (Orlando) -- Burning the midnight oil may be hazardous to your health.
Men who go to bed after midnight have significantly more arterial stiffening -- an early stage of atherosclerosis, or hardening of the arteries -- than men who turn in earlier, a new study shows.
Several large studies have linked chronic sleep loss to heart disease, diabetes, obesity, and other health problems, says Yu Misao, MD, of the Misao Health Clinic in Gifu, Japan.
But whether bedtimes also have an influence on heart health has not been explored, he tells WebMD.
Too Little Sleep Affects Heart Health
So Misao and colleagues put that question to the test in a study of 251 healthy men 60 and younger. They had an annual checkup, during which their blood pressure, body weight, body mass index (BMI), waist circumference, and lipid levels were measured.
Brachial-anklepulse wave velocity was used to examine the men for evidence of arterial stiffening. This measures how fast blood is rushing between the brachial artery in the arm and the tibial artery in the ankle. When blood pressure is high, blood flow accelerates, and the arterial walls stiffen.
All the participants filled out questionnaires that asked how many hours of sleep they got each night (six hours and 20 minutes, on average) and what time they went to bed (11:30 p.m. on average).
The fewer hours a man slept each night, the higher his BMI, blood pressure, and triglyceride levels, the study showed.
“This is consistent with previous reports showing that short sleep duration may negatively affect cardiovascular risk factors, Misao says.
There was no significant relationship between how many hours a man slept and arterial stiffness.
Late Bedtimes Linked to Arterial Stiffness
The men were then divided put into three groups according to the number of hours they reported sleeping at night: less than six hours, six to seven hours, and seven hours or more.
In each of these groups, the men who reported going to bed before midnight had more relaxed arteries, as shown by significantly lower brachial-ankle pulse wave velocity levels, than the men who went to bed after midnight.
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