A possible exercise?

A long time ago there was mention of a speed-building practice in a thread on the blog:


(Note: Link to the _Factors of Shorthand Speed_ document now kaputt!)

The idea was practicing for a long time without breaks to force the fatiguing muscles to learn how do the work with minimal effort. 

I am wondering if it would be possible to do something similar, but in a shorter time -- what would happen if a person were to practice with a weighted pen?  Something wrapped around the barrel, or attached to the top, perhaps. Has anyone ever heard of such an experiment? What would happen?

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