Enhanced deep sleep may boost heart health, research shows

Recent research conducted by ETH Zurich and the University of Zurich reveals that deep sleep, in particular, holds immense benefits for the cardiovascular system. The study, led by sleep expert Caroline Lustenberger and heart specialist Christian Schmied, demonstrates that targeted stimulation with brief tones during deep sleep can lead to more vigorous contractions and relaxations of the heart's left ventricle.

This effect results in improved blood pumping efficiency, enhancing the flow of oxygen-rich arterial blood to most organs, extremities, and the brain. The left ventricle functions as a crucial component of the cardiovascular system, supplying oxygenated blood to various parts of the body. When it contracts, it effectively wrings out the blood, increasing circulation and positively affecting heart health.

The study involved 18 healthy men aged 30 to 57, who spent several nights in a sleep laboratory. During these nights, researchers monitored brain activity, blood pressure, and heart activity. By playing brief tones known as pink noise during deep sleep, they aimed to stimulate enhanced deep sleep and observe its impact on the cardiovascular system.

The results were remarkable. After nights with sound stimulation, both the heart's pumping force and its relaxation were significantly improved compared to nights without stimulation. This finding suggests that sound stimulation during deep sleep can lead to better cardiovascular function.

Reference: Auditory stimulation of sleep slow waves enhances left ventricular function in humans, European Heart Journal, DOI 10.1093/eurheartj/ehad630