Joyce wrote So here goes ... I work out on the treadmill,
which is a speed factored activity (so this program tells me). This program
says
that someone my weight and height will burn 0.0874 calories/minute if
walking at
roughly 4MPH. BUT ... if going for a non speed factored brisk walk at 4MPH
(15
miles per minute) it says I will burn at a rate of 0.03174/minute. Can
anyone
explain to me why the difference rate of caloric expenditure between the two
activities? Or is it solely because on a treadmill it is a constant,
automated
speed?

Hi Joyce,
I think it is because the treadmill is a constant speed. Since with a brisk
walk you speed may vary over the distance covered, you might not know your
speed on a walk is increasing or decreasing. What program are you using?
Kristine