Originally Posted by
noglider
I think it's not that the upright position eliminates sweating. I think his theory is that upright riding discourages you from pedaling hard enough to sweat. But I'm just guessing.
Like I said, from my experience, making a conscious effort not to ride hard and sweat on the way to work, more upright = (slightly but noticeably) less sweaty.
You could easily test it yourself. With a speedo on a bike, on flat ground, using the same gear ratio and not pushing hard in either riding position.