dave.long at bluewin.ch
Thu Mar 4 08:13:01 PST 2010
> Though those adaptations make humans and our immediate ancestors
> better runners, it is our ability to run in the heat that Lieberman
> said may have made the real difference in our ability to procure game.
> Humans, he said, have several adaptations that help us dump the
> enormous amounts of heat generated by running. These adaptations
> include our hairlessness, our ability to sweat, and the fact that
> we breathe through our mouths when we run, which not only allows us
> to take bigger breaths, but also helps dump heat.
Men perspire, but horses sweat.
Rather than lose their hair, equids adapted a salivary protein to
produce latherin, which is currently believed to act as a wetting
agent, promoting evaporative cooling even through fur...
(horses can move 1'800L/min of air when working at 6,5kW. What's the
equivalent for human heat exchange?)
More information about the FoRK