Different data with tracking on Fenix 6 and Edge 530

Here's my theory:

Breath rate on the F6 requires a chest strap, because an optical sensor does not provide reliable HRV data. This is why you do not see breath data in the activity on F6. Now, the more interesting question is why there's breath data in the edge activity. See, heart rate data is transmitted from the F6 to the edge using the standard ANT+ HR profile. This profile requires HRV data to be mandatorily sent along with plain HR data. It is not reliable when comming from an optical sensor, but the edge does not know, that the data originates from an optical sensor. For the edge it is indistinguishable from HR data comming from a chest strap. Obviously, breath data obtained this way is just as unreliable as the HRV data.

Thanks for explanation. This makes sense. So Fenix 6 rejects his own breath rate in activities because this does not fullfill there own quality requirements...How ever in my opinion HRV rate is absolutly reliable enough for non professional sports 

Thanks so far

I allready did this. There is no respiration rate to select.

Rattatuii said:

So Fenix 6 rejects his own breath rate

No. The optical sensor does not provide HRV, hence the F6 has no way of calculating breath rate.

And where does this data comes from in the Edge tracking?
And why garmin connects shows breath rate for each time also without activities only by wearing the F6 the day?

Rattatuii said:

And where does this data comes from in the Edge tracking?

It might be based on fake HRV data injected into the ANT+ HR data stream, for example.

Rattatuii said:

And why garmin connects shows breath rate for each time also without activities only by wearing the F6 the day?

 I might have expressed myself somewhat imprecisely. When not doing an intense activity the optical sensor has an easier time tracking subtle changes is blood flow, thus making HRV possible, at least in theory. However in dynamic activities, especially when the watch bounces about your wrist, reliable HRV is too hard to achieve. In fact, I do not know if the sensor does not provide HRV during intense activities or if the watch just discards it as being unreliable. The result would be the same, for the sake of this discussion.

All of this is just my guesswork based on my understanding of both how the ANT+ HR profile works, and the principles and challenges of getting HRV data from an optical sensor. It kind of explains your issue, but you don't have to take my word on it. If anyone has a better theory, then please feel free to chime in.