Wrong calories are driving me mad!

[Rosie152]

These past 3 weeks my calorie burn for a 5k jog (35 mins - im not quick!) has been less than 100, whereas it's always been between 350 and 450. I can't understand why it's changed. I regularly burned 1900 kcal on a run day (with everything else I was doing) but I'm never getting close to 900 for the whole 24 hours. Can anyone help?

[JohnnyRow]

Check your weight, that it didn't accidentally get set way too low, like a misplaced decimal point.

[Nuke21]

Is it accurately detecting your heart rate? If it thinks you are working out but heart rate is never detected going above 80 it's going to think you're doing a pathetic workout versus if your heart rate is 145 the whole time.

[SomchaiArron]

you mean 350 and 450 

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Yeah you right though about that too 

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Moderator edit - merged messages

[YachatsMike]

I have a repeatability issue when I walk, too.  When I look at the heart rate chart, I kind of understand why.  The Fitbit measures my heart rate right at the border between light and moderate.  Slight changes in my speed might take it a little higher (AZMs accumulated) or a little lower (No AZM.s).  I can barely feel the difference.

That said, I have been getting more repeatable results if I clean the back of the watch and my wrist before I start my measured exercise.  I also raise where I wear my watch to make sure it is a full two fingers above my wrist bone.

Good luck