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In addition to lower heart rate variability, the researchers observed a predominance of the sympathetic nervous system over the parasympathetic nervous system in volunteers infected with SARS-CoV-2.

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When do the sympathetic and parasympathetic systems kick in? And what's with the vagus nerve? Skip next section More on Health from around the world ...

They work in the background to keep us on track and healthy, but they don't take up brain power or need to be controlled. Autonomic nerves are loosely split into either sympathetic or parasympathetic ...