Resonance Frequency (HRV Biofeedback)
Synchronizing the respiratory and cardiovascular systems to maximize autonomic resilience.
What is Resonance?
When you breathe at a specific rate—usually between 4.5 and 6.5 breaths per minute—your respiratory sinus arrhythmia (RSA) exactly matches the delay in your baroreflex (blood pressure regulation). This creates a massive, resonant spike in Heart Rate Variability (HRV).
Finding Your Frequency
| Breaths Per Minute | Inhale (sec) | Exhale (sec) |
|---|---|---|
| 6.0 BPM | 4.0 | 6.0 |
| 5.5 BPM (Average) | 4.5 | 6.5 |
| 5.0 BPM | 5.0 | 7.0 |
| 4.5 BPM (Tall adults) | 5.5 | 7.8 |
*Note: Exhalation is always extended to prioritize vagal tone.
Clinical Application
Used extensively by the VA for PTSD treatment. 20 minutes a day of resonance breathing permanently shifts the autonomic baseline, increasing vagal brake efficiency.
Common Mistakes
Breathing too deeply. At 5.5 BPM, people tend to take massive, heaving breaths. You must maintain a normal tidal volume (approx 500mL) despite the slow cadence, or you will hyperventilate.
FAQ
Q: How do I know my exact frequency without an ECG?
A: Start at 5.5. If you feel dizzy or anxious, speed up to 6. If you feel totally comfortable, try 5. The frequency that feels most effortless is usually your resonant frequency.