Heart Rate Variability (HRV) Calculator

Formula

The formula to calculate Heart Rate Variability (HRV) is:

\[ HRV = \frac{SDNN}{RMSSD} \]

Where:

\( HRV \) is the Heart Rate Variability (ms)
\( SDNN \) is the standard deviation of all normal RR intervals (ms)
\( RMSSD \) is the root mean square of successive differences between normal heartbeats (ms)

What is Heart Rate Variability?

Heart Rate Variability (HRV) is a measure of the variation in time between each heartbeat, controlled by the autonomic nervous system. It is an important indicator of physiological resilience and emotional flexibility, reflecting our ability to adapt effectively to stress and environmental demands. A higher HRV indicates greater adaptability and health, while a lower HRV is associated with stress, fatigue, and even burnout.

Example Calculation

Let's assume the following values:

Standard Deviation of all normal RR intervals (SDNN): 50 ms
Root Mean Square of Successive Differences (RMSSD): 30 ms

Using the formula to calculate HRV:

\[ HRV = \frac{50}{30} \approx 1.67 \text{ ms} \]

The Heart Rate Variability (HRV) is approximately 1.67 ms.