Vagis — autonomic measurement from a ring

Evidence

Measured against clinical references.

Before a metric earns a place in Vagis, it's checked against an established reference — ring-derived inter-beat intervals against a Polar H10 chest-strap ECG, the gold standard for R–R timing.

Vagis Ring HR vs single-lead ECG (Polar H10): MAE 0.91 bpm, r 0.97, 100% within 5 bpm across rest, stand and motion

Across rest, standing, and motion, the Vagis ring tracked single-lead ECG to a mean absolute error of 0.91 bpm (r = 0.97) — roughly four to five times tighter than the resting accuracy typically reported for consumer wrist-worn wearables, and comfortably within the ±5 bpm tolerance used as the industry benchmark. Based on a single user and a single test.

Vagis Ring PPI vs single-lead ECG R-R (Polar H10): mean abs error 6.73 ms, r 0.97, waveform r 0.98, recorded at rest with no ambulatory motion

At rest and during breathwork, the Vagis ring reproduced single-lead ECG inter-beat intervals to a median error of 4 ms (mean 6.7 ms, r = 0.97–0.98), with short-term heart-rate variability (RMSSD) agreeing to within ~2 ms — on par with the best consumer rings for HRV and approaching dedicated research-grade R–R recorders. Based on a single user and a single test.

What it measures

One wearable, multiple measurements.

Each mode reads the same pulse and motion signal during designed physiological challenges. Together they form a cross-modal picture no single recording can give.

Sleep

Overnight recovery, sleep depth, and autonomic activity through the night.

Circadian

The cost of the waking day — heart-rate response to movement and recovery.

Stand

Orthostatic response: how the system handles the shift to standing.

Breathwork

Respiratory coupling and the vagal response to paced breathing.

Rest

Resting autonomic rhythms and vascular oscillations, supine and still.

Exercise

Effort, zones, and how quickly the system stands down afterward.