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Your heart rate through kickboxing rounds

Ongoing studyShadow rounds and light sparring

This is an ongoing study. The figure will be updated here as more people are recorded.

OPTICAL

Accuracy

88.5%

Kickboxing and Muay Thai Heart Rate Agreement

measured against an ECG chest strap over the same rounds

Reference standard

ECG chest strap

Sample size

4 participants

Through a round the Ultrahuman Ring reads within twelve beats a minute of an ECG chest strap, on average.

Ultrahuman RingECG chest strapbeats per minute
88.5%agreement with the chest strap
11.9 bpmaverage difference
68%of readings inside the ±5 bpm / 10% tolerance
64–140beats 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.
-45-30-150+15+30708090100110120130140upper limit of agreement (+18.7)lower limit of agreement (-14.3)average offset +2.2 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.

Striking is a different problem from movement. Running adds a rhythm to the signal that a sensor can learn to ignore; a strike lands as a shock that displaces the sensor against your skin for a moment. The reading has to survive the impact rather than model it.

Everything else about the hand is working against it too. Wraps compress the finger, gloves press the ring into it, and bracing at the moment of contact tightens the forearm that feeds the vessels being read.

Rounds of shadow kickboxing with light sparring are interval work with impact added at the sensor site, and that is what the figure here describes.