2023-10-18 12:25:30
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Sleep: this is why a deficit, even slight, promotes heart disease
We already knew that lack of regular sleep promotes heart disease. We now know why thanks to a new study published in a journal affiliated with the prestigious journal Nature. This study also tells us that even a slight sleep deficit leads to increased cardiovascular risks.
You wake up at the same time every morning and have the same metro-work routine… Except that bedtime sometimes waits longer than necessary because you have many activities that keep you going until 11 p.m. or midnight. As a result, like a good half of French people, you sleep between five and seven hours per night instead of the recommended seven to eight hours. Unfortunately, this new study tells us that Even a slight chronic sleep deficit can increase the risk of developing heart disease later in life.
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Blood vessels subject to more oxidative stress
We already know that people who have mild but chronic deficits suffer more from heart disease later in life than those who get enough sleep, in particular by increasing the risks of hypertension, obesity or diabetes. This recent study highlights a new explanatory phenomenon: after only six weeks of shortened sleep, the cells lining our blood vessels are flooded with harmful oxidants.
This study was carried out on thirty-five healthy women who slept normally (seven to eight hours per night) for six weeks and then went to bed an hour and a half later than usual during the six weeks. following.
We then measured in these women the oxidative stress suffered by their endothelial cells (which play a crucial role in the control of vascular tone and local blood flow) and their antioxidant response (capacity of their cells to fight against aging linked to ‘oxidation). However, sleep restriction markedly increased endothelial oxidative stress and, at the same time, the body did not increase its production of endogenous antioxidants (glutathione, superoxidismutase, etc.).
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Sufficient sleep yes, but also regular!
So, when you sleep less than six hours a night, the cells that line the internal surface of the vessels have difficulty fighting against the attacks they undergo which, over time, increases cardiovascular risk. As Sanja Jelic, study leader and director of the Center for Sleep Medicine at Columbia, explains: “This is some of the first direct evidence that chronic mild sleep deficits cause heart disease. » So, it’s not just a matter of paying attention to getting enough sleep, but also of not chronically accumulating this sleep debt.
The specialist concludes that many problems could be solved if people slept at least seven to eight hours a night and warns: “Young, healthy people need to know that if they continue to sleep less, they increase their cardiovascular risk. »
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Bibliographic references 
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