Accuracy when first using Charge HR

puraze

I just started using my Charge HR last night. I recall reading somewhere that it becomes more accurate the longer you wear it and it better adjusts to you? Just wondering if and how bloated or under the numbers of steps, calories, etc. are in the beginning compared to a week or two later? I only ask because I am surprised with how high my steps and estimated calories burned are and don't want to take it verbatim if I shouldn't. I have been walking around and going up a number of flights of stairs, so it might be right. Just unsure...

editorgrrl

My adjustments got better, as if MFP was "learning" my routine. But my Fitbit burn was only off the very first day. When you set it up, it has to guesstimate your burn since midnight.

I was shocked how many calories Fitbit said I could eat. But I trusted my Fitbit, lost the weight, and have maintained for 11 months.

puraze

Great thanks!

heybales

There are 2 places it gets better at according to Fitbit mods.

The Fitbit setting of Personalized in your Food plan.
This is the setting where it takes historical days to help decide what today's full day burn is going to be, and between syncs with device, this is how much it increases your daily burn which is then passed to MFP to do math with.
It tracks weekdays and weekends differently, and it tries to figure out which days those are for you.
Now, if you sync constantly from device to smartphone Fitbit app - this really doesn't matter.

The other place is the HR based calorie burn for when HR is high enough and/or you start a workout activity.
One of the major non-viewable stat (VO2max) that must be calculated are done by using exercise frequency and resting HR, so as that is figured out, a better calorie burn based on HR is available.
Of course some of it is based on BMI so it could still be off by decent amount.

But the accuracy of step counts, and the stride length as major component to daily activity calorie count - is not adjusted.
If stride length is off as shown by measuring set distance and comparing to what Fitbit saw, then it should be corrected.

puraze

Thanks for the info. I did a stride test tonight and it seems to be on par, but I'm not great with formulas so I will re-read the one you posted in stickies and test again later to confirm.