What is heart rate variability (HRV)?

Heart Rate Variability (HRV) is a measure of the variation in time between consecutive heartbeats. The standard Deviation of normal-to-normal (SDNN) is a measure of HRV. SDNN is the standard deviation of the time intervals between each heartbeat, expressed in milliseconds (ms).

It is an indicator of the body's ability to respond to physical and psychological stress and reflects the autonomic nervous system (ANS), which regulates important bodily functions such as heart rate, blood pressure, and breathing.

A low HRV can indicate a reduced ability of the ANS to respond to stress and may be associated with an increased risk of health problems such as cardiovascular disease and depression.

Incorporating activities that promote HRV, such as exercise, deep breathing, and mindfulness practices, into one's daily routine may help improve ANS function and overall health.


What are Irregular Heartbeats? Click Here.

What is Heart Attack risk? Click Here.

What is Heart Rate? Click Here.