Armband and ZoneSense
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@ADidier According to what I have learned here: no. Your watch needs R-R data which optical sensors do not provide.
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@Gunnar said in Armband and ZoneSense:
@ADidier According to what I have learned here: no. Your watch needs R-R data which optical sensors do not provide.
Exactly
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I’ve read own Reddit that ZoneSense works with this optical heart rate monitor (Rhythm+2.0).
A comparison of the data between a chest strap and this optical sensor would be necessary.https://www.scosche.com/scosche-rhythm-plus-2-0-heart-rate-monitor-armband
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@Gunnar, according to to Texas Instruments Technical Article from May 2018 OHRs can and do measure R-R intervals. They state:
“Here’s further detail on some of the measurements possible with optical heart rate sensors:
…
R-R interval (heart-rate variability) – The R-R interval is the time between blood pulses; generally, the more varied the time between beats, the better. R-R interval analysis can be used as an indicator of stress levels and various cardiac issues.” (page 2)I would presume that also Suunto’s OHR measure R-R intervals as they calculate night time HRV.
That being said AFAIK the R-R measurements from OHR are not good (precise) enough for ZoneSense calculations which are thus limited to ECG (chest) straps. So even if Coospo OHR, or another OHR, does broadcast R-R interval data it would probably result in wrong/not accurate ZoneSense data.
https://pmc.ncbi.nlm.nih.gov/articles/PMC8927864/
Note that the HRV marketing of the Coospo might refer only to night time HRV calcualtion (as is the case with Polar Verity Sense).
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@ADidier I had the same sensor and tried it with ZoneSense, but it didn’t work.
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I have the Rhythm +2 band and recently updated its firmware to the new version that supports HRV. I’ve not tested but I don’t think it’s possible to do HRV alongside HR in a workout because you have to switch to HRV mode by triple-pressing the button. The docs indicate HRV mode is for apps such as HRV4Fitness rather than during workouts.
But I’ll try and see
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@Freezer Thank you for the detailed explanatiion. Lothar Matthäus would say “Again what learned”
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The thing is that the OHR sensors (watch and armbands) can measure R-R doing estimations as they can measure the HR. They do not measure directly the electric pulses as the chest straps. Is for that that that they do not work with Zonesense.
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@cosme.costa I think ZoneSense needs r-r data. I don’t know whether the watch can differ between ECG or OHR generated one. The HRM just has to deliver the r-r data to the watch to make it work.
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@2b2bff optical HR sensors can never be as accurate as measuring the electrical signal with a chest strap. The higher the heart rate, the shorter the R-R intervals, so the measurement error of optical signal detection are a higher percentage of the R-R interval as the HR increases. This throws the math of ZS way off.
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the raw signal picked up by chest straps is incredibly noisy. The HR monitors need to perform some serious heavy lifting to clean up the signal and track the heart. In many ways, the optical devices actually have an easier time of it. However, optical devices consume a lot of power and one way to improve power use is to drop the sample rate. When the sample rate is too low the r-r data is obviously going to be distorted. But I wouldn’t say optical HR monitors will never be accurate enough - it should be possible if there’s enough demand for manufacturers to develop high-sample-rate devices with enough accuracy.
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@far-blue They can be noisy (who cares) if they are the most accurate and the only reliable.
