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Your heart rate as you start walking

From standing rest into a walk
OPTICAL

Accuracy

93.7%

Indoor Walking Heart Rate Agreement

with an ECG chest strap reading the same treadmill walk

Reference standard

ECG chest strap

Sample size

43 participants

Going from standing still into a walk, the Ultrahuman Ring stays within five beats a minute of an ECG chest strap, on average.

Ultrahuman RingECG chest strapbeats per minute
93.7%agreement with the chest strap
4.4 bpmaverage difference
+3.0 bpmthe ring reads high, on average
56–107beats per minute the reference covered in study
Figure 1 — One continuous stretch from a single recording. The figures beside it are for the study as a whole, not for the stretch drawn. Average difference tells you how far a typical reading is from the reference, regardless of whether it is high or low. Average offset tells you the direction of that gap — whether the ring reads high or low, on average.
-20-100+105060708090100110upper limit of agreement (+12)lower limit of agreement (-6)average offset +3.0 bpmthe two devices averaged (beats per minute)ring minus chest strap (beats per minute)
Figure 2 — Every five seconds, against the chest strap
One dot is one paired five-second reading, as recorded, pooled across recordings.

A walk begins with a transition. You go from standing to moving, your heart rate climbs to meet the new demand, and your hand starts swinging at the same instant, so the signal changes and the noise arrives together. Catching a transition cleanly is a different test from holding a steady number.

The trace below spans the change rather than the settled part. The Ultrahuman Ring resolves the whole climb and locks onto the new level alongside the reference.

A reading built from the last few seconds of pulse lands a moment after a sharp change. What matters is how brief that moment is and how cleanly the reading settles afterwards, and both are visible in the chart.