Swimming active minutes

[JingaJesta]

Hi,

I understand that when swimming, Fitbit gives you two zone minutes because it considers you are in a cardio or peak workout. What I don't understand is why you also get some fat burning zone minutes. I can't find anything on the internet about some of the lengths being at a lower workout speed.

For example, my swim last night was 44 lengths in 31 minutes.

But I got 30 cardio or peak minutes and 15 far burning minutes, total 45 zone minutes.

Can someone explain what my Fitbit Sense is calculating please?

Any help is appreciated! Thanks.

[JohnnyRow]

I've never tracked swimming with a Fitbit, so maybe I'm not understanding the issue.  But it looks to me like 15 minutes in cardio (or peak) for 30 zone minutes, and 15 minutes in fat-burn zone for 15 zone minutes = total 45 zone minutes.

If you are questioning what fat-burn zone is, you can tap 'Zone Minutes' on phone app and see the heart rates for each zone, or you can read more on Fitbit's explanation at What are Active Zone Minutes or active minutes on my Fitbit device? 

[JingaJesta]

Hi, thanks for your reply. The problem as I see it is that the Fitbit
doesn't measure your HR when swimming. So how does it know what zone your
are in?

Regards,

Jordan

[JohnnyRow]

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@JingaJesta wrote:
Hi, thanks for your reply. The problem as I see it is that the Fitbit
doesn't measure your HR when swimming. So how does it know what zone your
are in?

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I see.  The only thing I could go by is that when you manually log a workout such as a walk or run, Fitbit uses the parameters you input to judge what your intensity must have been and assumes a steady pace throughout.  But that wouldn't explain your situation.  I probably shouldn't have even bothered trying to answer, not having used the swimming feature.  But maybe if it is counting laps and the time for each, it estimates that way.  But maybe you don't even get that info.