https://arunmitra.com/categories/physiology/ Recent content in Physiology on Arun Mitra Hugo -- gohugo.io en Mon, 01 Jun 2026 00:00:00 +0000 https://arunmitra.com/research/hrv-ageing-autonomic/ Mon, 01 Jun 2026 00:00:00 +0000 https://arunmitra.com/research/hrv-ageing-autonomic/ Background Heart rate variability (HRV) — the beat-to-beat fluctuation in heart rate — is a widely used, non-invasive index of cardiac autonomic regulation, and its time- and frequency-domain measures shift with age, sex, and environment. Most reference values in clinical and research use are derived from Western populations, yet autonomic function differs across regions and ethnic groups. This study set out to establish region-specific normative HRV values for a predominantly South Indian population and to characterise how those values vary with age and gender.