re: PuttaDaForkDown

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htownjeep

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i'll do better than that. i'll give you chris carmichael's exact formula which you can put into excel. (chris is lance armstrong's cycling coach since the early 90s and i'm using his book to train for bike racing):

weight in kilos (multiple lbs * 2.2)
height in cm (multiply inches by 2.54)
age

plug this into excel (Mifflin-St. Jeor equation):

= (10*[weight in kilos]+(6.25*[height in cm])-(5*[age in years])+5) * [1.25]

The [1.25] is a variable and it is derived from here:

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very light - most of workday is sitting or with some standing - relatively little physical activity - 1.25

light - work involves some sitting, mostly standing and walking - for example, retail sales - light recreational activyt - 1.55

moderate - work involves sustained physical activity with little sitting - for example, UPS or mail delivery person - active recreational pursuites. walk or bike to work - 1.65

heavy - occupation is physical labor - very active recreationally. few jobs all into this category - 2.0

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quote:

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calories burned during workouts
male body weight--------calories burned per hour
140----------------------------731
160----------------------------835
200----------------------------1044
220----------------------------1148

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so at 240 you can see you'll burn more calories just due to weight alone.

HOWEVER..if you add an hour of aerobic activity keeping your heart rate elevated (15-20 minutes of P90x would be even more strenuous) you add roughly 1000 calories to the total (see above).

So for me, I burn 2,401 daily without any exercise and 3,501 if i include an hour of moderate erobic exercise like spinning on my bike and putting my heart in the 130-140ish bpm range.

comment from Chris on all this:

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It is important to know that the process of calculating total daily caloric expenditure is not perfect. The Mifflin-St. Jeor equation is more accurate than others, but calculations are often less accurate than direct measurements. Using data from your power meter is one of the most accurate available outside a labratory.

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heart rate monitors dont always tell you the whole story. they do quite a bit of guessing. the only surefire calorie burn you can quantify is by using a power meter (and those are expensive and only work for cyclists). eveything else is just software interpreting your numbers.

for instance, i plugged my ride data (including HR) into 4 different websites, and i got anywehre from 2,200 to 4,100 calories burned from the exact same HR data.