Gday,
A long, long, time ago, in a galaxy pre internet I read that a major
cause of fatigue was the "jiggling" of the muscles in the arms and such
due to road vibration. The article went on to say that one of the main
benefit of cycling jerseys was that they helped minize this jiggle. The
more I type the more far fetched this is sounding.
Now I'm only a recreational cyclist ( 0 - 200 kms per week depending on
my mood) but I've just moved back to a steel frame from an aluminium
one. Although the steely is appreciably heavier to carry up the stairs
I'm finding I'm riding faster and longer on it than the old aluminium
one. My rides are rolling so whilst there are no really steep hills
it's continually up and down with typically just enough flat in between
so you've gotta work up all the rises( joy). I find particularly on one
of the longer hills, which has a pretty poor road surface, that I never
used to ride "thru the top" as my tenderised butt needed to come off
the saddle at the top to give it a break. Now i just pedal on through.
So in my personal experience it seems that any benefit you get from
the lighter frame of aluminium is offset by the fatigue your body
suffers as a result of the harsheness of your rides.
My 2c worth,
Cheers,
Will.