Trusting fitbit numbers
aliciab307
Posts: 370 Member
Stats
24, F
196lbs~
37.6%bf~
Lift 4-5x/wk
Zumba 2x/wk
Walk 10-22k/day
Ok so I have the fbChargeHR. And for the past 2 wks my avg burn is 4.1k-wk 1, 4k-wk 2.
What is the margin of error for fitbit, if anyone knows? I'm wondering how much I should trust FB numbers. Lifting sessions are about 30-60 mins, zumba is about 45-60 mins
24, F
196lbs~
37.6%bf~
Lift 4-5x/wk
Zumba 2x/wk
Walk 10-22k/day
Ok so I have the fbChargeHR. And for the past 2 wks my avg burn is 4.1k-wk 1, 4k-wk 2.
What is the margin of error for fitbit, if anyone knows? I'm wondering how much I should trust FB numbers. Lifting sessions are about 30-60 mins, zumba is about 45-60 mins
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Replies
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Bump0
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If you join the fitbit group you might find more people with the answer for you if you post your question there. Just a thought.0
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Thx. I'll check there0
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The calorie burn for the lifting should be manually entered, as HR based formula is going to inflate it.
HRM formula for calorie burn is only valid for steady-state aerobic exercise, same HR for 2-4 min.
Lifting if done right is just opposite of that.
For your other stuff, if the HRM formula is good for you, could be decent enough.
Here's study on a much nicer Polar HRM, with self-tests for needed stats, and the results using lab measured stats.
http://www.myfitnesspal.com/topics/show/459580-polar-hrm-calorie-burn-estimate-accuracy-study
And no - I doubt Fitbit is using formula nearly as good as Polar's.
Otherwise, the device underestimates for daily calorie burn outside of exercise.
It assumes sleeping level calorie burn for all non-moving time - BMR.
But when awake you burn more - RMR.
When standing not moving you burn even more.
When digesting/processing food you burn more, about 10% of calories eaten.
So outside of exercise - underestimated.0
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