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Heart Rate Variability

Meaning

Heart Rate Variability, or HRV, is a non-invasive physiological metric that quantifies the beat-to-beat variations in the time interval between consecutive heartbeats, reflecting the dynamic interplay of the autonomic nervous system (ANS). High HRV generally signifies a robust and adaptable ANS, indicating parasympathetic dominance and a state of resilience and recovery, while low HRV suggests sympathetic dominance, often associated with chronic stress, inflammation, and HPA axis dysregulation. Clinically, it serves as a critical biomarker for assessing an individual’s allostatic load and overall physiological reserve.