Hi Tony The quote was made by Bill Marrass (Ohio State U) in the early 1990s, I’m not aware of the actual article but it had to do with "tendon excursion" through the carpal tunnel. Good luck with your search.
I had polio in November 1949 in Scotland, when I was 18 months old. While I don’t have the fatigue you mention, I do feel I don’t have the control over my foot I once had, and I am sure it isn’t related to age as I am fit and can do most things. It is an interesting concept and I am aware of older folk ending up in wheelchairs as a result.