What is Heart Rate Variability?

Heart rate variability (HRV) is the variation in time between successive heartbeats. A healthy heart does not beat like a metronome — the tiny fluctuations between beats reflect how well your autonomic nervous system is balancing activity and rest.

Why higher HRV is generally better

  • It reflects strong parasympathetic ("rest and digest") tone.
  • It is linked to better cardiovascular fitness, recovery, and emotional regulation.
  • It is sensitive to sleep, stress, training load, alcohol, and illness.

How to improve HRV

  1. Prioritize 7–9 hours of consistent sleep.
  2. Practice slow, diaphragmatic breathing for 5–10 minutes daily.
  3. Move regularly — Zone 2 cardio is especially helpful.
  4. Limit alcohol, late caffeine and ultra-processed foods.

HRV trends matter more than single readings. Track the 7-day average.

If you notice a sustained drop in HRV along with symptoms like chest discomfort, breathlessness or palpitations, speak to a qualified clinician — HRV is a wellness signal, not a diagnostic tool.