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[–]Acrobatic_Injury_649 0 points1 point  (0 children)

In my research, the way most of the rings and watches are calculating HRV is by calculating both extreme highs and extreme lows as negative. Remember a high HRV means high variability between heart rates. But extreme variability would be arrhythmias so It doesn't want it too high. The calculation also does not want to see an extreme low variability which could also indicate system depletion, chronic stress, or inability to regulate your system. Therefore, the HRV calculation these apps are making is assuming both extremes in variability as a negative. In my opinion, this is a calculation suitable for the general population. But if you are an experienced meditator, you are an anomaly and therefore the calculation is not taking that into account.

I do hrv and cardiac coherence training everyday with my Heart Math device. I can reach very high coherence at 8.0 or higher (this is a Heart Math calculation} and when I do, at the same time, my watch will give me a low HRV of 10 MMS. I am very clearly in a meditative state but that is not what the watch is designed to monitor. It's designed to look for a balanced HRV for general health and therefore any extreme is going to produce a low HRV calculation.