What your heart-rate variability reveals about your stress
HRV is one of the clearest windows into your nervous system. Here's how to read it, and gently train it higher over time.
Heart-rate variability (HRV) is the tiny variation in time between heartbeats. Counter-intuitively, more variation is usually a good sign.
What it's actually measuring
HRV reflects the balance between your "rest and digest" and "fight or flight" systems. Higher HRV generally means your nervous system is flexible and recovering well; a sustained drop can signal stress, poor sleep, or illness.
Read trends, not single numbers
One reading means little. What's useful is your trend over weeks, and noticing what nudges it up (good sleep, gentle movement) or down (late alcohol, short nights).
Training it higher
Slow breathing, around six breaths a minute, is the most direct way to raise HRV in the moment, and over time. A few minutes daily is enough to start.
This article is for general information and is not a substitute for professional care. If you are in crisis or thinking about harming yourself, please contact your local emergency services or a crisis line. See crisis lines.