WHAT IS HEART RATE VARIABILITY (HRV) AND WHY DOES IT MATTER FOR HEALTH?

Think about your heartbeat. If you are an average adult, it will go “thump thump” around 60 to 100 times per minute. This is known as your resting heart rate. Between every “thump thump” lies a small period of time—let’s say around 1000 milliseconds—referred to as the “inter-beat-interval.”

image from firstbeat.com