// Labs & Tools
Practice, don't just read.
Interactive labs to feel the physiology, compare devices, and audit popular claims.
Lab 01
Paced breathing · 4-in / 6-out
~6.0 br/min — within the resonance-frequency window for most adults.
inhale
4
Safety: Stop if dizzy. Avoid breath retention if pregnant, hypertensive, or with arrhythmia/seizure history.
Lab 02
HRV simulator
Why a single HRV reading isn't a "vagus score."
Estimated RMSSD
63ms
Breathing rate12 br/min
Posture
Fitness percentile50
Toy model — illustrative only. Real HRV is also affected by age, sleep, meds, alcohol, fever, measurement window, and algorithm.
Lab 03
Device comparison
| Device | Type | Indications | Evidence |
|---|---|---|---|
| Implanted VNS (LivaNova) | Invasive | Drug-resistant epilepsy, TRD | A |
| Vivistim (paired) | Invasive | Chronic ischemic stroke UE rehab | A |
| SetPoint | Invasive | RA after biologic failure (FDA 2025) | A |
| gammaCore | Cervical nVNS | Migraine, cluster headache | A/B |
| Auricular taVNS (research) | Transcutaneous | Investigational: insomnia, pain, PD… | C |
| Consumer 'vagus' devices | Consumer | Wellness marketing claims | E |
Lab 04
Myth checker
No — vibration and slow exhalation may modestly affect autonomic markers, but not equivalent to electrical VNS.