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Parasympathetic Restoration Index

Meaning

The Parasympathetic Restoration Index is a calculated physiological metric, often derived from Heart Rate Variability (HRV) analysis, that quantifies the degree of recovery and regenerative activity mediated by the parasympathetic nervous system (PNS). A high index indicates robust vagal tone and an efficient “rest-and-digest” state, signifying successful physiological and psychological recovery from stress or exercise. Clinicians utilize this index as a direct, objective measure of the body’s ability to downregulate stress and facilitate anabolic processes like sleep and tissue repair.