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Vagal tone is activity of the vagus nerve (the 10th cranial nerve) and a fundamental component of the parasympathetic branch of the autonomic nervous system. This branch of the nervous system is not under conscious control and is largely responsible for the regulation of several body compartments at rest.
Excessive activation of the vagal nerve during emotional stress, which is a parasympathetic overcompensation for a strong sympathetic nervous system response associated with stress, can also cause vasovagal syncope due to a sudden drop in cardiac output, causing cerebral hypoperfusion. Vasovagal syncope affects young children and women more ...
Because vagal tone can reduce heart rate, VNS carries the risk of bradycardia (excessively slow heart rate, and even of stopping the heart. [ 43 ] A range of side effects are possible but rare.
Vagal nerve stimulation implants can sometimes cause side effects, such as shortness of breath, site irritation or vocal hoarseness when the device is on, experts said.
His research has shown that experiences of awe are also linked to elevated vagal tone, “a marker of the activation of the vagus nerve, which is this large bundle of nerves that really helps you ...
As a general consideration, increased vagal tone (and thus vagal action) is associated with a diminished and more variable heart rate. [ 18 ] [ 19 ] The main mechanism by which the parasympathetic nervous system acts on vascular and cardiac control is the so-called respiratory sinus arrhythmia (RSA).
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The vagal afferents are activated during the gastric phase of digestion when the corpus and fundus of the stomach are distended secondary to the entry of a food bolus. The stimulation of the mechanical receptors located in the gastric mucosa stimulates the vagus afferents.