Commonly performed tests of autonomic function

Test	Principle	Nerves assessed
Sweat test	Heat stimulates thermoregulatory center	Central sympathetic adrenergic and peripheral sympathetic cholinergic
BP lying, standing	Postural BP control by adrenergic nerves	Sympathetic adrenergic
RR interval with deep breathing	Vagal reflux bradycardia	Cardiac vagus
Plasma pancreatic polypeptide response to modified sham feeding	Sham feeding stimulates vagal center and efferents	Efferent vagus to abdomen

Graphic 82750 Version 2.0

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