Heart Rate Variability
A normal heart beats 60 to 80 times a minute at rest. The time between the beats is measured in milliseconds and it always varies. This is called Heart Rate Variability (HRV).
Hiroko Demichelis | Heart rate variability and the science of letting go
When you breathe in, your heart rate increases. When you breathe out, your heart rate slows down.
SMART Heart Rate Sensor+
Personalized breathing exercises guided by your live heart rate readings. Measures SpO2, PR and Heart Rate Variability (HRV)