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How accurate is the edge 305 HR at counting calories?

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How accurate is the edge 305 HR at counting calories?

Old 05-06-08, 08:14 PM
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Jay68442
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How accurate is the edge 305 HR at counting calories?

Can I count on these numbers to be reasonably accurate?
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Old 05-06-08, 08:17 PM
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No.
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Old 05-06-08, 08:18 PM
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You have to keep in mind that unless it is taking into account the temperature, your weight+bike's weight+slope of incline and the efficiency with which you pedal it isn't possible to measure the calories you're burning.

For example, even if you used a powertap to say you're generating exactly 250 watts of energy, your body may be burning up to what would be equivalent to 300 watts because some of it is lost to keeping it warm and the obvious inefficiencies dealing with muscles.

So basically, no.

However if it says you're burning 15 Calories (kcals, not simply calories - since we generally call the kilocalorie (1000 regular calories) a "calorie" without realizing it is a kilocalorie) a minute, it is probably close enough not to fidget over.

I mean, you may be burning like 13 or 18, but really I expect you'll be burning more than what it says since you aren't 100 percent efficient and thus some "wasted" calories must be taken into account. Then again if the machine tries to take that into account and overestimates the inefficiencies it could give you a number bigger than you're burning.

Lol, way to make you sweat on the bike
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Old 05-06-08, 08:28 PM
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not very
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Old 05-06-08, 08:59 PM
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popular question tonight.

no.

it puts all the importance on speed. it doesnt consider heart rate or elevation at all in its formula.

later.
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Old 05-06-08, 09:59 PM
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I have a prototype model that has a gut sensor. If that isn't accurate I do not know what is. I feel like a ham though when I am pricked by that sensor. Nice bacon fat drips off my jersey in the process.
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Old 05-06-08, 10:01 PM
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You'd think there would be a site at which Garmin data could be uploaded, that could use that data for a more accurate count.

You can do so manually at Kreuzotter.
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Old 05-06-08, 10:07 PM
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Originally Posted by aham23 View Post
no.

it puts all the importance on speed. it doesnt consider heart rate or elevation at all in its formula.
I don't believe that is correct. I read somewhere that it is "more accurate" when used with the HR strap, which means that it must take HR into account. It must be more than just speed anyway, because if I climb it estimates more calories than if I rode the equivalent distance at a higher speed but lower effort. It's still not particularly accurate, but probably more so than HR alone. Mine reads higher than my Polar HRM did, and that was close but definitely slightly high.
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Old 05-06-08, 11:45 PM
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I would say it seems to vary widely. Just checked the same commute route from last year using my Polar and seemed to measure in around 800-900 calories.

Garmin for the same trip hovers around 1500 calories. Everyone likes to say that he Polar units are off by quite a bit as well.

Who knows. I probably only burn like 25 calories on that commute. That's because I am a wussy.
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Old 05-07-08, 05:19 AM
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There is no such thing as accuracy in the measurement of calorie burn. The best you can do is get a power meter and measure effective work, but then you have to guess at your body's energy efficiency, which varies wildly from person to person.
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Old 05-07-08, 06:43 AM
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Not sure, I have a Garmin forerunner, and also a nike plus for running, and they pretty much count the same calories and both include weight. It would be cool to get a scientific opinion on this. Scientists, it's all you.
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Old 05-07-08, 07:00 AM
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I rode a century on Sunday with both a Powertap and an Edge 305. 100 miles, 9000 ft of climing, about 6 hours of ride time. Powertap - 4070, Edge - 7298. I don't think the PT is exactly right, but it is a lot closer than the Edge.
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Old 05-07-08, 07:38 AM
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Originally Posted by s.peterson View Post
I rode a century on Sunday with both a Powertap and an Edge 305. 100 miles, 9000 ft of climing, about 6 hours of ride time. Powertap - 4070, Edge - 7298. I don't think the PT is exactly right, but it is a lot closer than the Edge.
Were you using the Edge's HR strap?
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Old 05-07-08, 08:21 AM
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Originally Posted by umd View Post
Were you using the Edge's HR strap?
I was using the PT's HR strap, which is read by both the PT (SL 2.4 wireless version) and the Edge. When I got the PT, I just had the Edge "find" the HR strap I was wearing, so now both devices read off of the one strap.
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Old 05-07-08, 08:31 AM
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Originally Posted by s.peterson View Post
I was using the PT's HR strap, which is read by both the PT (SL 2.4 wireless version) and the Edge. When I got the PT, I just had the Edge "find" the HR strap I was wearing, so now both devices read off of the one strap.
I do it the other way...

I use the Garmin strap with my PT...

I find the Garmin strap more comfrotable...



The 305 is not even close to accurate when counting calories...

You can pretty much ignore those numbers...
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Old 05-07-08, 08:32 AM
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Thanks for the feedback guys.
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Old 05-07-08, 08:37 AM
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Originally Posted by Hammertoe View Post
I do it the other way...

I use the Garmin strap with my PT...

I find the Garmin strap more comfrotable...



The 305 is not even close to accurate when counting calories...

You can pretty much ignore those numbers...
Other than the graphics printed on the front, my garmin and saris straps appear to be identical.
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Old 05-07-08, 08:56 AM
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Originally Posted by s.peterson View Post
Other than the graphics printed on the front, my garmin and saris straps appear to be identical.
I will have to take a closer look but I think the plastic part of the straps is different on mine....

The Garmin seems to be more flexible...
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Old 05-07-08, 09:01 AM
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My unscientific observation says the Edge may overestimate caloric expenditure .. and potentially by significant amountsI just got the Edge after years with Polar A5. I'm registering more calories on my normal routes with the Edge.

As a training tool, it's fine. If you are concerned about counting calories, I'd either 1. use a more accurate meter/method or 2. calibrate the Edge with a [better] known meter.
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Old 05-07-08, 09:09 AM
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Originally Posted by s.peterson View Post
I rode a century on Sunday with both a Powertap and an Edge 305. 100 miles, 9000 ft of climing, about 6 hours of ride time. Powertap - 4070, Edge - 7298. I don't think the PT is exactly right, but it is a lot closer than the Edge.
this is what my experience has been with the Edge 305. it measures some 30 to 40% higher then then my previouis Polar unit and most online calculators. obviously, they are all just estimates and to be taken with a grain of salt.

later.
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Old 05-07-08, 09:19 AM
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Originally Posted by Psimet2001 View Post
I would say it seems to vary widely. Just checked the same commute route from last year using my Polar and seemed to measure in around 800-900 calories.

Garmin for the same trip hovers around 1500 calories. Everyone likes to say that he Polar units are off by quite a bit as well.

Who knows. I probably only burn like 25 calories on that commute. That's because I am a wussy.
Interesting. I've compared the 305's estimates (w/out HR strap, just user data) to what my Polar says for a ride, and they're pretty comparable most of the time. I was considering getting the strap for the Edge just to free up handlebar space, since I don't wear the Polar as a watch anyway.

For indoor workouts, the 305 isn't accurate at all without a strap (I don't know about how it is with one), because it doesn't account for how the sweltering heat affects my heart rate and some extra resistance from the trainer.
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Old 05-07-08, 09:21 AM
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For some reason Garmin chose to base calories on speed and not HR. Compared to my polar 720 it over estimates cals by 25% of more.
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Old 05-07-08, 09:44 AM
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I can believe 30-40%. My example neglected to add that I am riding a heavier bike (about 30 lbs heavier fully loaded) with 32 knobbies with smaller gearing as well.

....and it's up hill ...both ways....in the snow....
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Old 05-07-08, 10:03 AM
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Originally Posted by azdroptop View Post
For some reason Garmin chose to base calories on speed and not HR. Compared to my polar 720 it over estimates cals by 25% of more.
My observation is that it is consistently about 30% higher than my Polar. However, it does base it on HR, it just uses a different estimation based on that HR than Polar does.
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Old 05-07-08, 10:06 AM
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Just checked mine after my last ride. It said, "Calories: You suck and you're fat."

I think that's pretty accurate.
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