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Arthur T Knackerbracket has found the following story:

Research shows anti-hypertensive drugs improve heart rate more in patients who listen to music after taking medication. Among musical genres, classical music is the one with greatest efficiency at reducing arterial pressure; authors of the study speculate whether music acts on the patients' parasympathetic system, increasing their capability of absorbing medication.

In addition to remembering to take the medication prescribed by their cardiologists at the right times and going to the trouble of making healthy lifestyle changes, patients with high blood pressure (hypertension) can include a pleasing beneficial activity in routine treatment of the disease thanks to the discovery that listening to music significantly enhances the effect of anti-hypertensive drugs.

[...] "We've observed classical music activating the parasympathetic nervous system and reducing sympathetic activity," said the principal investigator of the FAPESP-funded project. The sympathetic and parasympathetic nervous systems constitute the autonomic nervous system, which maintains homeostasis. The sympathetic nervous system accelerates heart rate, constricts blood vessels and raises blood pressure. The parasympathetic nervous system controls the body at rest, slowing the heart, lowering blood pressure, and stabilizing blood sugar and adrenaline.

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