Heart rate variability and autonomic function
HRV is the variation in time between consecutive heartbeats. It reflects the dynamic interplay between sympathetic and parasympathetic branches of the autonomic nervous system.
Key findings:
- Higher HRV correlates with better cardiovascular health, reduced all-cause mortality, and improved stress resilience (Thayer et al., 2012)
- HRV biofeedback training produces lasting improvements in autonomic regulation and emotional control (Lehrer & Gevirtz, 2014)
- Low HRV predicts anxiety disorders, depression, and post-traumatic stress (Chalmers et al., 2014)
Application: Nervop uses HRV as a primary biomarker because it provides real-time, objective feedback on nervous system state. Training protocols are designed to improve HRV over time.