Heart Rate Variability

Heart Rate Variability (HRV) refers to the physiological phenomenon of variation in the time interval between heartbeats, which is assessed by measuring the changes in the duration between successive heartbeats. HRV is an important indicator of autonomic nervous system function and is widely used in the evaluation of cardiovascular disease risk, psychological stress monitoring, and analysis of exercise training effects, among other areas, making it highly valuable in clinical and research settings.