Heart Rate Variability (HRV): What It Is and Why It Matters for Longevity
Your heart doesn’t beat like a metronome. And that’s a good thing. The variation in time between consecutive heartbeats — a measurement called heart rate variability, or HRV — is one of the most sensitive windows into your body’s physiological state. High HRV signals a nervous system that’s adaptable, resilient, and well-recovered. Low HRV signals … Read more