Yep, when i am on other PC's (meaning not mine), i usually go for the left hand on the mouse now. I do believe that. I remember my fingers started shaking as if they were lifting heavy stones when i started doing finger exercises (looked funny) :D It was even kind of demoralizing to me as the movement was initially extremely narrow. I even remember having muscle ache from a few exercises. Was some weird experience having that in the fingers :)
it might take some time till there's an perceivable improvement. Just don't overdo.