Heart rate variability is the difference in time between your heart beats. Heart rate variability is an overall indicator of health and can show you how your autonomous nervous system is performing. A person’s HRV will change depending on stress. It is lower when people are stressed and rises as people are relaxed. The easiest way to measure heart rate variability is with an ECG. It can also be measured at home with a chest strap and app that analyzes the data.
“Heart rate variability (HRV) is the variation of the time interval between two heartbeats. In other words, it is an accurate and noninvasive measure into the functioning of the autonomic nervous system (ANS). The autonomic nervous system is defined as the part of the nervous system that supplies the internal organs including the blood vessels, heart, stomach, liver, kidneys, digestive glands, and others. Your ANS responds to exercise, how you perceive stress, what you eat, and other factors.”