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Sense HRV accuracy

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‎11-22-2020 08:38

‎11-22-2020 08:38

One of the reasons I bought Sense was HRV. But I'm confused now because, after 5 days of using it, my average HRV is 128ms. I was wondering if anyone has similar HRV values to mine because from what I read, for my age and gender it should be around sixty.

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2 REPLIES 2

‎11-22-2020 09:23

‎11-22-2020 09:23

Maybe you are healthier than the average person of your age. 60 is good for a 35 year old.

At 67 I routinely get a score of 60. A normal 67 year old should be closer to 30

 

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‎11-23-2020 02:59 - edited ‎11-23-2020 03:03

‎11-23-2020 02:59 - edited ‎11-23-2020 03:03

HRV is a tricky thing. Without any context, it's very hard to tell whether it is better or worse for our health. There are perfectly healthy people with higher and lower HRV (or RMSSD). In general, a higher number may mean "better" but doesn't have to, and without interpretation, it may stay meaningless. For the last two days I got quite high HRV, and just today HRV = 75, resting HR = 43 and RMSSD = 132.52ms. Looks quite good. However, recent stress (physical and mental) seems to be taking a toll on my parasympathetic nervous system. Interpretation and context are enough to plan my next training, but the raw numbers tell me really nothing. They don't show reality.

 

Accuracy is quite a different thing. Wrist-based HR monitors usually have rather a low accuracy when it comes to measuring HRV and it's better to use chest straps for that purpose. Knowing, from my own experience, how inaccurate HR monitor could be when I was using Charge 2 and Ionic in the past, I wouldn't use it for measuring HRV which requires a lot more accurate sensor than when measuring HR only. If Fitbit wants to provide HRV, there must be some context associated with it. Without it, there's always gonna be a bunch of users who will get anxious about their results as there is no way to tell what it means. HRV is a great tool if only handled properly and mind, not everyone can really see the benefits of using it. For some people, it will have no real value (probably, athletes using it in training may benefit the most). It is a great buzz-word to sell devices, though 😉

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