Setup Polar HRM for more accurate calorie burn for known BMR

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Replies

  • brayaddie
    brayaddie Posts: 101 Member
    Bump
  • diddyk
    diddyk Posts: 269 Member
    Saving for later. Will need to read over and over and over!
  • HappilyLifts
    HappilyLifts Posts: 429 Member
    bump
  • pstansel74
    pstansel74 Posts: 130 Member
    Well, I set mine up per the formula. The BMR given here was a couple hundred different than the BMR using the "Eat More" methodology, but I figure it's close enough to count. I'm 37 and my age to hit the BMR was 53 :( I'll be ionterested to see what difference that makes in the calculations for my normal workouts.
  • heybales
    heybales Posts: 18,842 Member
    Well, I set mine up per the formula. The BMR given here was a couple hundred different than the BMR using the "Eat More" methodology, but I figure it's close enough to count. I'm 37 and my age to hit the BMR was 53 :( I'll be ionterested to see what difference that makes in the calculations for my normal workouts.

    Since you are following a great program to lose weight and maintain your LBM, you should for sure re-measure every 5 lbs lost, to see how the BF% changes, and re-adjust.

    You'll be getting younger as you go along.

    Oh, confirm you adjust the HRmax stat, because the default 220-age was applied automatically when you changed the age.

    And that HRmax stat being lowered (since you appear to be older) would mean your calorie burns would actually go up at the same HR effort.

    Edit: You know what, to keep this simple and let you log it somewhere, and adjust a stat not used in other calculations, just this spreadsheet, the HRM tab, upper section. Use the 3rd section for getting better HRmax estimate for that stat too.

    Since you are doing the EM2WL method, you'll recognize the other tab there already. You can use it for logging too.

    https://docs.google.com/spreadsheet/ccc?key=0Amt7QBR9-c6MdGVTbGswLUUzUHNVVUlNSW9wZWloeUE

    I give some description of the sheet here.

    http://www.myfitnesspal.com/topics/show/620206-spreadsheet-for-bmr-tdee-deficit-calcs-mfp-tweaks-hrm
  • pstansel74
    pstansel74 Posts: 130 Member
    So I should change my height to the results in Step 3? And that's all I need to do for the HRMax to be more correct?
  • pstansel74
    pstansel74 Posts: 130 Member
    Still confused... should I change the age based on the formula on the first page and then the height based on the spreadsheet? Or just the height?
  • heybales
    heybales Posts: 18,842 Member
    So I should change my height to the results in Step 3? And that's all I need to do for the HRMax to be more correct?
    Still confused... should I change the age based on the formula on the first page and then the height based on the spreadsheet? Or just the height?

    Well, the height has to do with the HRM doing a BMR calc. So Step 3 is correct for BMR to be correct on the HRM.

    The HRmax doesn't involve height.

    The HRmax has a bigger influence

    The spreadsheet is an update to this topic. Age was originally used because a few I talked with about it thought the idea of metabolic age sounded interesting to know.
    But height is easier to change, and it doesn't make the HRM adjust the HRmax automatically.

    So just use the spreadsheet. Now, this OP second half did discuss the HRmax, which is more important still - but I put that in the spreadsheet too.
  • KarenJanine
    KarenJanine Posts: 3,497 Member
    Bump
  • pstansel74
    pstansel74 Posts: 130 Member
    Thanks! I figured it didn't make sense to adjust both but wanted to be sure.
  • dogacreek
    dogacreek Posts: 289 Member
    Bump to read later
  • IrishDaveRed
    IrishDaveRed Posts: 36 Member
    :smile:
  • BSchoberg
    BSchoberg Posts: 712 Member
    My Polar is in the mail! Great info at the perfect time! Thank you!

    Ditto... perfect timing!
  • ces921
    ces921 Posts: 17 Member
    bump thanks
  • catniss
    catniss Posts: 326 Member
    bump for later when my hubby can do the numbers....she says in a very small voice....
  • pstansel74
    pstansel74 Posts: 130 Member
    So I used the spreadsheet. Based on the data I entered in the top section it told me to set my height to 49 inches (I'm actually 67) and then in the bottom section the numbers came out to 188 for the MaxHR. I have the FT7 so that's about all I can set. Does that sound right? An excercise routing that was reading at 510 calories before came out at 335 with the new numbers :(
  • NoxDineen
    NoxDineen Posts: 497 Member
    Just got a FT7 last night, bump for reference.

    OP, thanks for the research and tutorial. :)
  • heybales
    heybales Posts: 18,842 Member
    So I used the spreadsheet. Based on the data I entered in the top section it told me to set my height to 49 inches (I'm actually 67) and then in the bottom section the numbers came out to 188 for the MaxHR. I have the FT7 so that's about all I can set. Does that sound right? An excercise routing that was reading at 510 calories before came out at 335 with the new numbers :(

    Sounds about right.

    So for starters, your HRmax is a tad higher than calculated, so it really wasn't as much effort as the HRM thought you had wherever the HR normally is.

    Then, for right now anyway, your BMR really isn't as high as the worst BMR estimate the HRM was using.

    So indeed, burning less than thought.

    Now though, you find out what your normal workouts burn after a couple weeks, use the TDEE Deficit tab, and you can better estimate your real TDEE in section that says you have HRM calorie burn stats.

    So while you in reality are burning less than you were informed - you can better estimate your TDEE and then take a deficit from it. So potentially better loss there too.
  • heybales
    heybales Posts: 18,842 Member
    Just got a FT7 last night, bump for reference.

    OP, thanks for the research and tutorial. :)

    Post topic discovery of easier way to do it.

    I give some description of the sheet here.

    http://www.myfitnesspal.com/topics/show/620206-spreadsheet-for-bmr-tdee-deficit-calcs-mfp-tweaks-hrm

    Use that spreadsheet, the HRM tab, and read down the list. Top section and bottom section on improving accuracy.
  • bump
  • Pollux
    Pollux Posts: 42
    bump
  • Shrinking_Moody
    Shrinking_Moody Posts: 270 Member
    Thanks for the info!
  • mgs68pony
    mgs68pony Posts: 306 Member
    BUMP FOR LATER
  • dandaninc
    dandaninc Posts: 392
    Bump for when I purchase mine.
  • gemmaleigh1989
    gemmaleigh1989 Posts: 241 Member
    This is so confusing :(

    First question is regarding eating back exercise calories?!! My BMR Is 1600 (using Harris Benedict equation) so to create a deficit to lose weight I aim to eat 1200-1300 cals a day and exercise on top of that meaning I'm netting at well below 1200.... I always thought that's how to lose weight by creating a calorie deficit? What's wrong with netting below 1200? I know eating below 1200 Is a big no-no but I thought as long as you consume at least that, whatever you net at isn't an issue regarding metabolism??

    I'm getting a polar in the next day or two and want to get my head around this first :S

    I am tossing up between the ft4 and ft60. The only reason I'd go the ft60 is because it has the fitness tests on there meaning in theory, it should be more accurate... If tweaking the stats of the ft4 as stated In your original post, does it make the ft4 as accurate? I read somewhere that you should never buy a HRM where you can't test or manually put in your vo2 max so I was going to fork out for the ft60 for that reason :/
  • BlueEyedTXmom
    BlueEyedTXmom Posts: 179 Member
    bump
  • heybales
    heybales Posts: 18,842 Member
    This is so confusing :(

    First question is regarding eating back exercise calories?!! My BMR Is 1600 (using Harris Benedict equation) so to create a deficit to lose weight I aim to eat 1200-1300 cals a day and exercise on top of that meaning I'm netting at well below 1200.... I always thought that's how to lose weight by creating a calorie deficit? What's wrong with netting below 1200? I know eating below 1200 Is a big no-no but I thought as long as you consume at least that, whatever you net at isn't an issue regarding metabolism??

    I'm getting a polar in the next day or two and want to get my head around this first :S

    I am tossing up between the ft4 and ft60. The only reason I'd go the ft60 is because it has the fitness tests on there meaning in theory, it should be more accurate... If tweaking the stats of the ft4 as stated In your original post, does it make the ft4 as accurate? I read somewhere that you should never buy a HRM where you can't test or manually put in your vo2 max so I was going to fork out for the ft60 for that reason :/

    The FT60 is just using a variation of this formula.
    http://www.myfitnesspal.com/topics/show/577839-hrm-s-with-vo2max-stat-improve-calorie-estimate

    It is NOT giving you a fitness test to better estimate VO2max, but it does at least give you the stat to correct, and likely would need to still.
    http://www.myfitnesspal.com/topics/show/459580-polar-hrm-calorie-burn-estimate-accuracy-study

    Regarding BMR though.

    Just confused over what BMR means. Go to MFP - Tools - BMR Calc and read the blurb. Or Google what it means.

    Now, does that sound like the calorie level you must create a deficit too? Correct, no. Unless you really are bed-ridden and do no activity. The minute you are awake you are actually at RestingMR, and RMR is higher than BMR.

    1200 is the recommended bare minimum to eat for someone not exercising. Bare, safe, no benefit, minimum.

    You here to make your body better, or to do the bare minimum?
    Ever buy a cheap product, like a tool, or clothes? How long do you expect the cheapest to last? How much stress can you put on it before it's ruined and you throw it away and buy another? How long until you discover that for some clothes or tools it's better to have it last longer by spending more money just once up front.
    Ever watch the Holmes shows? Minimum code requirements - is it best for your bare safety, or best for performance and longevity?

    How do you want to view your body and exercise?

    You made it 1200 BTW, probably because you selected the NON-recommended 1lb per week weight loss, and selected Sedentary activity level, whether true or not. Those with BodyMediaFit's and FitBit's discover their normal daily activity outside exercise (which is what MFP is asking for) is really at Lightly Active level.
  • bump
  • yecatsml
    yecatsml Posts: 180 Member
    Just to make sure I have this right - my Polar FT40 asks for BF input as well as age, height and weight so I still want to change it?

    Age 41
    Height 64"
    Weight 149
    BF measured by BodPod 7/21 23.5%

    BMR - 1405
    BF - 24.5 using CB (nice that it is pretty darn accurate!)
    BMR After BF input - 1482

    I can't tell if the website is broken/down as I change the age and nothing happens. I tried refreshing, clearing cache, etc. Anyway, it looks like 24 is the age I need to enter into the HRM instead of 41? It has been giving me what I think are low burn numbers - about 1/2 of what MFP and others show. (5.25 mi walk at 4mph consistently for 300 cal)
  • heybales
    heybales Posts: 18,842 Member
    Just to make sure I have this right - my Polar FT40 asks for BF input as well as age, height and weight so I still want to change it?

    Age 41
    Height 64"
    Weight 149
    BF measured by BodPod 7/21 23.5%

    BMR - 1405
    BF - 24.5 using CB (nice that it is pretty darn accurate!)
    BMR After BF input - 1482

    I can't tell if the website is broken/down as I change the age and nothing happens. I tried refreshing, clearing cache, etc. Anyway, it looks like 24 is the age I need to enter into the HRM instead of 41? It has been giving me what I think are low burn numbers - about 1/2 of what MFP and others show. (5.25 mi walk at 4mph consistently for 300 cal)

    Well, I didn't know that model asked for BF% - nope, use that, and VO2max for best accuracy from other thread that is already best bet.

    Change of age or height was merely to get around HRM's that don't let you change the other stats.
    You are so close anyway, won't make much of a difference.

    You are correct on that BMR site. When using the more accurate BMR based on bodyfat%, only weight matters, not age or anything else. The study on that BMR calc found age didn't matter. LBM just takes so much energy to run metabolism. Unless you are highly efficient cardiovascularly, or massively out of shape.

    Of course, that BMR calc is also deflated for over fat, because fat does require some energy use, but it isn't used in the calc.