Supported Apple Watches
Read more
Explore other metrics
Breathing
Exercise
Heart
Sleep
Your heart rate variability (HRV) is a powerful metric of your overall health. HRV measures the difference in time between each heartbeat, which fluctuates slightly. High HRV is generally considered better. Low HRV can be caused by medical conditions, stress, or intense fitness training.
The average heart rate variability is
Breathing
Exercise
Heart
Sleep