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ACTIVEGRANDMAP's Photo ACTIVEGRANDMAP Posts: 3,065
2/1/13 1:25 P

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Thanks for the info.I just started really paying attention to that report when I got the iPod for christmas. It' s on the app and i've been looking at it every day. fun to run around the house a few times and try to get the burn number higher. Pam

"A merry heart doeth good like a medicine"
Proverbs 17:22


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SLYSAM's Photo SLYSAM SparkPoints: (37,311)
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2/1/13 1:20 P

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Hi Activegrandmap, that makes sense. Sort of. I don't really look at that report, but I just ran one for last month to see. I noticed my Spark calorie burn is considerably higher than my fitbit calorie burn each day. But here is why (the numbers work out for me), Spark uses the Harris Bennedict formula to estimate BMR and fitbit uses a different formula. I don't know for sure what formula Fitbit uses but from leaving my fitbit on a table (with calorie estimation turned off) I learned my fitbit BMR is similar to the Mifflin formula (there was a two calorie difference between fitbit and mifflin for me). Harris Bennedict credits me with a higher bmr than Mifflin by about 120 calories. So Spark is starting out assuming a higher bmr than fitbit is, then spark is using the 1.2 sedentary multiplier to estimate my non exercise calorie burn. Not the fitness minutes Spark is pulling from fitbit also contain our bmr, for me my fitbit bmr seems to be about 1 calorie a minute. So the difference for me was the starting BMR + 1 inute for each exercise calorie. I only really looked at one day in detail to compare though.

It might also be that your Spark calorie burn on this report is higher than your fitbit calorie burn estimate if you look at the corresponding day.

Yes Spark is using your profile data to estimate your bmr. There is a nice detailed post from Coach Becky somewhere on the site that outlines all the steps Spark uses to calculate our allowances. It is from that post that I learned which formula Spark is using.

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ACTIVEGRANDMAP's Photo ACTIVEGRANDMAP Posts: 3,065
2/1/13 12:30 P

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the number I'm looking at is the calorie differencial on Spark. It uses the calorie burn sent over from fitbit. I guess spark estimated my BMR from my age and weight and height. Pam

"A merry heart doeth good like a medicine"
Proverbs 17:22


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SLYSAM's Photo SLYSAM SparkPoints: (37,311)
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2/1/13 12:21 P

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What number are you looking at? Between Spark and fitbit there are a lot of different numbers.

I find the fitbit calorie burn to seem pretty reasonable and accurate compared to other sources for me. The fitbit calorie burn from walking is not x steps=y calories. It is possible to have a lower step count activity or day that actually has a higher fitbit calorie burn. That is because the fitbit calorie burn has to do with how much and how fast you move each minute in the day, I think impact has a little to do with it too. It is more complicated than just step count. It has more to do with the minutes spent in the different activity levels (well, in reverse, the 4 activity levels have to do with the calorie burn per minute--there is a range of calories per minute for each level. But that is a bigger clue than total step count). Also, if you are looking at the fitbit activity record for a walk, that does include bmr so the more minutes spent doing an activity the more of that is BMR. For me it comes out to a little less than a calorie per minute, but I don't think fitbit deals in fractions so I just round it up to one calorie per minute is my bmr. That number will vary by the person--depending on your height, weight, age, and gender.

Technically the BMR is meant to be what you would burn resting in a dark room, so it is the calorie burn someone of your height, weight, age and gender would burn if you stayed in bed, in the dark all day. To estimate a sedentary level activity burn, it is common to multiply bmr by 1.2 because they are assuming that for a sedentary person bmr is 80% of the total calorie burn, this activity level assumes no exercise and fairly low moving around (step count). Your fitbit burn should be higher than your bmr unless you stay in bed all day, adding 500 calories to that is probably pretty normal really. On a very good day I can add about 1000 calories to that, but that is with a lot of activity--more than I can do on a daily basis (my current bmr is estimated at 1299).

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ACTIVEGRANDMAP's Photo ACTIVEGRANDMAP Posts: 3,065
2/1/13 11:15 A

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I usually burn around 300-400 calories with according to my fitbit( I'm a pretty small person). Remember that the BMR they give you is if you are just sitting all day( mine is 1350). I eat around 1600 calories a day( according to spark numbers) and my weight has been pretty stable the whole time, so I think it's accurate for me. I love the calorie differencial report on the spark app. Pam

"A merry heart doeth good like a medicine"
Proverbs 17:22


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USMAWIFE's Photo USMAWIFE SparkPoints: (451,278)
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2/1/13 10:22 A

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FB is going to track all movement . I walk a lot and would have thought I would be burning more than I am but you have to remember, calories in which are synced over from SP vs calories burned at the end of the end on FB

Everybody tells me that they would love to knit, but they don't have time. I look at people's lives and I can see opportunity and time for knitting all over the place. The time spent riding the bus each day? That's a pair of socks over a month. Waiting in line? Mittens. Watching TV? Buckets of wasted time that could be an exquisite lace shawl. ~Stephanie Pearl-McPhee, At Knit's End: Meditations for Women Who Knit Too Much


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PAMMYLYNN's Photo PAMMYLYNN Posts: 77
2/1/13 10:18 A

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I've noticed that FB translates the number of steps I've walked in a day to the number of calories burned. It's general what I consider a huge number. It doesn't seem realistic that I've burned ex. 594 calories, just walking normal, daily walking. This is sync with my workout's in sparkpeople and I guess I'm not sure I feel like I've actually earned them.

Anyone else have this, thought of this, or can share some words of wisdom?

Thanks so much.

Pam
"I can do all things through Christ who strengthens me."


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