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Who is good @ calculating calorie burn?(10 posts)

Who is good @ calculating calorie burn?Kvonnah
Mar 13, 2003 6:22 PM
I don't know if this is enough info but here goes. I'm 195 lbs (6'5") I rode 40 miles (rounded up for ease actual amount 38.7) at 18.7mph average (rather proud of that number my best yet) Is this enough info to determine the answer?

Thanks in advance for the help! Oh, and it was 74 degrees in Denver today!!
re: Who is good @ calculating calorie burn?filtersweep
Mar 13, 2003 6:29 PM
I'd guess about 1500-1700
re: my spreadsheet says 2184teamsloppy
Mar 13, 2003 7:24 PM
Assumming no altitiude gain.
Assuming no wind
assumin your bike weighs 21 lbs
My spreadhsheet says: 2184 Kcals.

Average Speed MPH 18.5
Cv = average Speed of cyclist (meters/sec) 8.270013889
K1 (85 Kg weight) = constant 3.59
K2 (85 Kg weight) = constatnt 0.251
Mass of Bike in Lbs - water, tools, pump 21
Weight of Cyclist in LBS 195
Mass in Lbs - bike and cyclist 216
Em = (mass of cyclist and Bike in Kg) 97.97544
Wind speed MPH 10
Cw = Wind speed meters/sec 3
s = slope in grade % 0.50%
a = acceleration (meters/sec-sec) 0

Cal ingested/minute = 16.83910021
Cal ingested/hour = 1010.346013
Cal/mile = 54.61329798
Cal/20 miles = 1092.26596

Total Altitude Gain (feet) 0
Total Altitude Gain (meters) 0
Conversion Kg-meters(joules) to Kcals 418.48
Cal/altitude gain = 0

Round Trip + Alt 2184.531919

The Crux calculation is Cal ingested / minute:
=CV*(Kone+(Ktwo*(CV+Cw)*(CV+Cw))+((10.32*Em*(s/100+1.01*a/9.86))))/(69.78*0.25)

Every thing else is just units conversion.
Oops! used 10 MPH head wind (Is there Mathcheck for Windows?)teamsloppy
Mar 13, 2003 7:36 PM
Looks like entered a 10 instead of a 0 for wind speed (and 3 meters/sec!)

Looks like with the 0 MPH wind speed, 1279.6 Kcals

Average Speed MPH 18.5
Cv = average Speed of cyclist (meters/sec) 8.270013889
K1 (85 Kg weight) = constant 3.59
K2 (85 Kg weight) = constatnt 0.251
Mass of Bike in Lbs - water, tools, pump 21
Weight of Cyclist in LBS 195
Mass in Lbs - bike and cyclist 216
Em = (mass of cyclist and Bike in Kg) 97.97544
Wind speed MPH 0
Cw = Wind speed meters/sec 0
s = slope in grade % 0.50%
a = acceleration (meters/sec-sec) 0

Cal ingested/minute = 9.863920231
Cal ingested/hour = 591.8352139
Cal/mile = 31.99109264
Cal/15 miles = 639.8218528

Total Altitude Gain (feet) 0
Total Altitude Gain (meters) 0
Conversion Kg-meters(joules) to Kcals 418.48
Cal/altitude gain = 0

Round Trip + Alt 1279.643706
Can I get a copy?Fred2000
Mar 14, 2003 9:06 AM
Any chance I can get a copy of the spreadsheet?

Thanks, Jon

podmore@yahoo.com
1126.5 is what I get.Ken of Fresno
Mar 13, 2003 7:24 PM
That is assuming flat land and a combined bike and rider weight of 215 lbs.

[(18.7)(215)(.0053) + .0083(18.7)^3]7.3 = 544 cal/hr.

38.7 miles ave 18.7mph = 2.07 hrs riding time.

= 1126.5 calories burned

Congratulations. You just earned a Double Western Bacon Cheeseburger.

Cheers,
Ken
re: Who is good @ calculating calorie burn?Kvonnah
Mar 13, 2003 10:13 PM
Thanks for info all!! Can anyone point me to where I can find a calculator for this?
if you can believe anything in Bicycling magazine ...tarwheel
Mar 14, 2003 4:53 AM
Bicyling has a calorie calculator in the training section of their website. I plugged in your numbers with the closest solo speed (16-16.9 mph) and got 2198 calories. In their next category, 20+ mph drafting, it showed 2930 calories. Those numbers all seem on the high side to me, so I wouldn't put a lot of stock in them. Here's a link:

http://www.bicycling.com/training/0,5094,,00.html
It was actually up to 77 yesterdayColnagoFE
Mar 14, 2003 6:37 AM
Check this out. Nice little "all in one" system for tracking calories and activities so you can see how much your burning vs eating. http://www.fitday.com/WebFit/Index.html
Numbers, numbers.....Alexx
Mar 14, 2003 9:24 AM
Even the best calculations are just approximations. Nothing more.
Why do you need a number, anyway? To know how many nutrient bars to bring? Your body doesn't burn them at 100% efficiency, you know...
You shouldn't look at short-term effects of any diet or exercise program-there are too many variables to consider. Just make sure you are getting enough protein (for muscle development) as well as carbohydrates (for energy). Always consume some protein shortly after a hard ride, too.