-- Last Updated: Jan-10-13 4:54 PM EST --
Higher cadence, particularly within the relatively narrow window where the blade is square to the stroke always increases speed, up to a point.
That point is where our technique, control of shaft/blade, fails; towards which we practice to improve muscle memory and finite control at speed.
Then there is the conditioning thing, remembering that tumblehome is built into hulls so when we blow chunks they land outside the boat.
Interesting reading list on cadence:
Endecott, Wm, The Barton Mold 1995
Heed & Mansfield, Canoe Racing, 2005
Szanto, Canoe Racing, no date??
Toro, Canoeing; an Olympic Sport 1986
Winters, The SHape of the Canoe, 1996