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Watching Walter Lewin's lecture on how much energy people actually use during exercise is fascinating. (It's lecture 14 in his classical mechanics lectures from MIT). The gist of it is that the vast majority of energy use is used for basic things, like keeping the body emitting ~100 W all the time.curtis osterhoudt <flutzpah@yahoo.com> 4/17/2009 2:13 pm >>>
Here, the dominant effect is the rhythmic contraction of various muscles
which augment the energy converted to heat and to pumping blood to the
brain.
> it is F.x that determines the amount of energy expended.
>
Life-forms don't quite follow this relation, which works rather well for
all too solid masses of other kinds.