HRV Analysis
Your Window Into the Autonomic Nervous System
Heart Rate Variability measures the natural variation in time between heartbeats. Unlike a steady metronome, a healthy heart shows constant, subtle variation reflecting your body's ability to adapt to stress and changing demands.
Higher HRV generally indicates better cardiovascular fitness, stress resilience, and recovery capacity. Lower HRV can signal stress, fatigue, or overtraining.
HRV Metrics We Measure
Overall HRV indicator, reflects all cyclic components
Unit: msShort-term variability, parasympathetic activity
Unit: msPercentage of beat intervals >50ms difference
Unit: %Sympathetic/parasympathetic balance
Unit: ratioHRV Applications
Stress Monitoring
Track stress levels objectively through HRV patterns. Identify chronic stress before burnout.
Recovery Assessment
Monitor recovery from exercise, illness, or stressful periods. Know when you are ready to perform.
Mental Health
HRV correlates with anxiety and depression. Track the physiological impact of interventions.
Fitness Optimization
Use HRV to guide training intensity. Avoid overtraining by tracking readiness daily.
HRV Monitoring FAQ
Common questions about contactless HRV analysis
What is Heart Rate Variability (HRV)?
Heart Rate Variability measures the variation in time between consecutive heartbeats (R-R intervals). Unlike heart rate which is an average, HRV reflects the dynamic balance between your sympathetic (fight-or-flight) and parasympathetic (rest-and-digest) nervous systems.
What HRV metrics does Circadify measure?
We measure time-domain metrics including SDNN (standard deviation of N-N intervals), RMSSD (root mean square of successive differences), and pNN50 (percentage of successive intervals differing by more than 50ms). These are derived from the beat-to-beat intervals detected via rPPG.
How does contactless HRV measurement work?
Our rPPG technology detects beat-to-beat intervals from facial video, then calculates time-domain HRV metrics (SDNN, RMSSD, pNN50). This enables convenient HRV tracking for wellness monitoring, stress assessment, and tracking changes over time.
What does high or low HRV indicate?
Generally, higher HRV indicates better cardiovascular fitness and stress resilience - your heart can adapt quickly to changing demands. Lower HRV can indicate stress, fatigue, or poor recovery. However, HRV varies significantly between individuals, so tracking your personal trends is most valuable.
When should I measure HRV?
For consistent tracking, measure HRV at the same time each day - morning after waking is ideal. Avoid measuring right after exercise, caffeine, or stressful situations for baseline readings. Our app can help establish your personal HRV baseline.
Request A Demo
See how contactless vitals can transform your healthcare delivery.