Heart rate variability (HRV) is a measure of the overall adaptability of an organism and thus a measure of health. The heart rate variability is calculated from the millisecond intervals between the individual heartbeats of a person. The change in these time intervals is a measure of the regulatory ability of the autonomic nervous system .
The autonomous nervous system controls all essential functional processes in the human organism. The interplay of its two branches – sympathetic for performance and parasympathetic or vagus for regeneration – can be recorded and made visible by measuring the heart rate variability as evidence-based autonomic functional diagnostics.
