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Study: Too much, too little sleep can lead to heart disease

by WorldTribune Staff, January 21, 2019

Six hours of quality sleep per night is the minimum needed to help keep your heart healthy, according to a new study.

Chronic lack of sleep and poor sleep quality raise the odds of fatty plaque accumulation in arteries – a condition known as atherosclerosis – which increases the odds of heart attack and stroke, according to the study, which was published on Jan. 14 in the Journal of the American College of Cardiology.

Subjects who slept less than six hours a night were 27 percent more likely to have body-wide atherosclerosis than those who slept six to eight hours a night, the study found.

Too much sleep wasn’t great for the heart, either. The study also found that women who slept more than eight hours a night had an increased risk of atherosclerosis.

Participants with “poor-quality” sleep – frequent awakenings or difficulty getting to sleep – were also 34 percent more likely to have atherosclerosis, compared to those with good-quality sleep, the study found.

“This is the first study to show that objectively measured sleep is independently associated with atherosclerosis throughout the body, not just in the heart,” said lead researcher Jose Ordovas, an investigator at the National Center for Cardiovascular Research in Madrid, Spain. Ordovas also directs nutrition and genomics at the Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University in Boston.

Ordovas said there are many ways to fight heart disease, including “pharmaceuticals, physical activity and diet. But this study emphasizes we have to include sleep as one of the weapons we use to fight heart disease – a factor we are compromising every day.”

In the new research, Ordovas said his team used coronary ultrasound and CT scans to track the artery health of nearly 4,000 Spanish adults. The study participants, with an average age of 46, did not have heart disease at the beginning of the study.

People who had short and poor-quality sleep also tended to consume higher levels of caffeine and alcohol, Ordovas noted.

“Many people think alcohol is a good inducer of sleep, but there’s a rebound effect,” he said. “If you drink alcohol, you may wake up after a short period of sleep and have a hard time getting back to sleep. And if you do get back to sleep, it’s often a poor-quality sleep.”

Two U.S. experts agreed that sleep is a key component of cardiovascular health.

“Targeting one’s sleep habits is finally getting recognized in the medical world as an important factor to improve heart disease,” said Dr. Eugenia Gianos, who directs women’s heart health at Lenox Hill Hospital in New York City.

Gianos reasoned that behaviors in a person’s waking hours may explain the sleep-heart connection. That’s “because patients with good sleep hygiene have the energy to be physically active, make healthy food choices and handle stress better.”

Dr. Thomas Kilkenny, who directs sleep medicine at Staten Island University Hospital, said the new study “opens a door to further investigations to hopefully demonstrate the cause and effect between poor sleep quality and the generation of atherosclerosis disease.”

“In the meantime, physicians should constantly evaluate their patients to identify sleeping disorders and stress to their patients the need to maintain at least six to eight hours of sleep per night,” Kilkenny said.


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