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Edge 305 & Calories

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01 / Original postEdge 305 & Caloriessteve · 14 Apr 2008 02 / This pagePosts 1–6Page 1 of 1 · chronological order 03 / Latest replyPost #6datakoll · 21 Apr 2008

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Cycling Equipment
Published
14 April 2008
Last activity
21 April 2008
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steve
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Cycling computers

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  1. Original post
    steve
    Archived post
    #1

    Edge 305 & Calories

    My new Garmin Edge 305 calculates the calories I have supposedly used
    during a ride. Knowing the calories and time I should be able to
    estimate my wattage for the ride. However, when I do this I get more
    that a Kilowatt. I rode for slightly less than 2 hours and used 1750
    calories. If I really could generate over a kilowatt for an hour I'm
    in the wrong business. I know about the Kcal vs cal issue but neither
    answer makes sense.

    I figure there are three possibilities.

    1 - The 305 over estimates the calories used.

    2 - The number is the calories to run the old bod + what ever I have
    to generate for the ride. This still doesn't maker sense to me
    because, if I remember right, the base rate for a person is about 200
    watts and I don't believe I can generate 800 watts either.

    3 - I'm missing something here

    BTW does anyone know what algorithm the edge uses to calculate
    calories?

    Thanks
    Steve G

    Report
  2. Lou Holtman
    Archived post
    #2
    steve said:

    Edge 305 & Calories

    My new Garmin Edge 305 calculates the calories I have supposedly used
    during a ride. Knowing the calories and time I should be able to
    estimate my wattage for the ride. However, when I do this I get more
    that a Kilowatt. I rode for slightly less than 2 hours and used 1750
    calories. If I really could generate over a kilowatt for an hour I'm
    in the wrong business. I know about the Kcal vs cal issue but neither
    answer makes sense.

    I figure there are three possibilities.

    1 - The 305 over estimates the calories used.

    2 - The number is the calories to run the old bod + what ever I have
    to generate for the ride. This still doesn't maker sense to me
    because, if I remember right, the base rate for a person is about 200
    watts and I don't believe I can generate 800 watts either.

    3 - I'm missing something here

    BTW does anyone know what algorithm the edge uses to calculate
    calories?

    Thanks
    Steve G

    Divide it by 4. That's your efficiency. In: 1000 Watts, out: 250 Watts.
    Bummer....

    Lou

    Report
  3. steve
    Archived post
    #3
    Lou Holtman said:
    steve said:

    Edge 305 & Calories

    Quoted message said:

    My new Garmin Edge 305 calculates the calories I have supposedly used
    during a ride. Knowing the calories and time I should be able to
    estimate my wattage for the ride. However, when I do this I get more
    that a Kilowatt. I rode for slightly less than 2 hours and used 1750
    calories. If I really could generate over a kilowatt for an hour I'm
    in the wrong business. I know about the Kcal vs cal issue but neither
    answer makes sense.

    Quoted message said:

    I figure there are three possibilities.

    Quoted message said:

    1 - The 305 over estimates the calories used.

    Quoted message said:

    2 - The number is the calories to run the old bod + what ever I have
    to generate for the ride. This still doesn't maker sense to me
    because, if I remember right, the base rate for a person is about 200
    watts and I don't believe I can generate 800 watts either.

    Quoted message said:

    3 - I'm missing something here

    Quoted message said:

    BTW does anyone know what algorithm the edge uses to calculate
    calories?

    Quoted message said:

    Thanks
    Steve G

    Divide it by 4. That's your efficiency. In: 1000 Watts, out: 250 Watts.
    Bummer....

    Lou

    Thanks

    250 is about what I expected.

    Steve G

    Report
  4. BobT
    Archived post
    #4

    "steve" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    Edge 305 & Calories

    My new Garmin Edge 305 calculates the calories I have supposedly used
    during a ride. Knowing the calories and time I should be able to
    estimate my wattage for the ride. However, when I do this I get more
    that a Kilowatt. I rode for slightly less than 2 hours and used 1750
    calories. If I really could generate over a kilowatt for an hour I'm
    in the wrong business. I know about the Kcal vs cal issue but neither
    answer makes sense.

    I figure there are three possibilities.

    1 - The 305 over estimates the calories used.

    2 - The number is the calories to run the old bod + what ever I have
    to generate for the ride. This still doesn't maker sense to me
    because, if I remember right, the base rate for a person is about 200
    watts and I don't believe I can generate 800 watts either.

    3 - I'm missing something here

    BTW does anyone know what algorithm the edge uses to calculate
    calories?

    Thanks
    Steve G

    Your device is estimating calories burned. You may be comparing to power
    applied to the pedals as measured by a device such as a powertap or SRM.

    Your "motor" is not 100% efficient. You are expending calories to work you
    brain, digest your food, grow your fingernails, etc. Perhaps 25% of your
    caloric expenditure ends up being transferred to the pedals to propel the
    bike.

    BobT

    Report
  5. Rocky
    Archived post
    #5

    The efficiency of the human bod from input to output is about 25% or 20%
    depending on how you calculate it.

    If you include the calories you would have burned by sitting around then you
    use the 20% number. That is, total energy burned divided by energy into
    the pedals is 5.

    If you don't include the resting energy then the ratio is 4. That is,
    incremental energy used.

    I also have an Edge 305 and I think it greatly (as in 2x) over estimates
    calories burned. I have various other methods to estimate energy used and
    they all give me a number about half of what the Edge does.

    Rocky

    "BobT" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    "steve" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    Edge 305 & Calories

    My new Garmin Edge 305 calculates the calories I have supposedly used
    during a ride. Knowing the calories and time I should be able to
    estimate my wattage for the ride. However, when I do this I get more
    that a Kilowatt. I rode for slightly less than 2 hours and used 1750
    calories. If I really could generate over a kilowatt for an hour I'm
    in the wrong business. I know about the Kcal vs cal issue but neither
    answer makes sense.

    I figure there are three possibilities.

    1 - The 305 over estimates the calories used.

    2 - The number is the calories to run the old bod + what ever I have
    to generate for the ride. This still doesn't maker sense to me
    because, if I remember right, the base rate for a person is about 200
    watts and I don't believe I can generate 800 watts either.

    3 - I'm missing something here

    BTW does anyone know what algorithm the edge uses to calculate
    calories?

    Thanks
    Steve G

    Your device is estimating calories burned. You may be comparing to power
    applied to the pedals as measured by a device such as a powertap or SRM.

    Your "motor" is not 100% efficient. You are expending calories to work
    you brain, digest your food, grow your fingernails, etc. Perhaps 25% of
    your caloric expenditure ends up being transferred to the pedals to propel
    the bike.

    BobT

    Report
  6. datakoll
    Archived post
    #6

    http://www.nytimes.com/slideshow/2008/04/18/world/0418-HAITI_index.html

    Report

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