Cold, Clammy Hands
After short, intense periods of typing, my hands become cold and clammy. They sweat slightly when I am typing fast. The coldness halts some of the sweat production, I suspect, but the sweat makes my palms mildly sticky.
My hands seem to react this way rather quickly. I know many other people who type rapidly but do not have this problem. Those people also don't have RSI. Maybe they will develop cold, clammy hands once they develop RSI.