On Tue, 12 Mar 2002 15:00:38  
 Pat Naughtin wrote:
>Dear Joe, Marcus, and All,
>
>Do you know if this 'some factor of 4 or something' is a reasonably
>consistent value for the difference between energy consumed internally vs
>mechanical energy output? Is it consistent over a range of physical
>activities in addition to those available on a treadmill?
>...
Dear Pat,

This is what my treadmill manual textually says about the above.
Fat burning
To burn fat effectively, you must exercise at a relatively low intensity level for a 
sustained period of time.  During the first few minutes of exercise, your body uses 
easily accessible carbohydrate calories (SIC) for energy.  Only after the first few 
minutes does your body begin to use stored fat calories (SIC) for energy.  If your 
goal is to burn fat, adjust the speed and incline of the treadmill until your heart 
rate is near one of the lower two numbers in your training zone.  It may also be 
helpful to set the speed control on the console to FAT BURN to help you maintain the 
proper intensity level.

And that's it!  Nothing else.  I started the treadmill for a few minutes to find out 
if I could identify the ratio between these two, and as far as I can tell that 
relationship appears to be 3.21 to 1, i.e. cal to fat cal.  I also noticed that the 
speed does not seem to change this ratio significantly.

There, I hope this was helpful in some way, Pat.  I'm still puzzled though by these 
numbers and do not know what to make of them.  When I run on my treadmill I usually 
end up spending about 2-2.2 MJ per half-hour of running.

Marcus


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