Excuse me for my stupidity . . . How about a spring scale on a boat
and the paddler paddling with comparable strain to what would be a
normal paddle effore for an hour watch the weight and average it. For
the strain at the hand use the same scale or replace it with a preasure
scale ( bathroom scale ) and again replicate the average paddle strokes
preasure.
Just a thought.
Or if you are good at math you can nick someone elses work.
Sorry, Kieran; I am that simple .
Alex McGruer