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heart rate variability

With watch OS4, Apple Watch now measures also HeartRateVariability in mS ??

But what's a normal value and can someone please explain a little bit more about this HRV, like when and how often it's measured. And most important, like I asked before, what are normal values. My watch now says that my HRV is 46 ms.

最后更新：2017-09-20 19:56:57

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