QUOTE(PianoDoodler @ Oct 29 2009, 11:16 PM)

One of the many mistakes people make is to carry on pressing when they are holding down notes.
You can get the feeling very easily. Depress a note on the piano and keep on pressing hard. Release it, depress it again and this time release most of the press, only using enough power to keep the note depressed.
Sounds like this note needs some pretty pink pills to treat its depression.
Sorry. More seriously, the above exercise highlights how little effort is needed to keep a key\group of keys depressed, yet most people use far too much weight for the same purpose.
If you have been using too much weight on the chords you describe, then this is a sure recipe for hurting yourself. Lots of pianists, myself included, play pieces involving chords ridiculously to large for their hand span without injuring themselves simply because they know how to use their weight appropriately.
Hope that thumb clears up soon. Once it does, treat it kindly when you play.

Have never thought about how much weight I use to keep the keys depressed, especially playing chords, interesting, will bear this in mind thanks
I have only noticed a stretching feeling when practising G5 arpeggios quite intensively, i.e. 2 pages of them, fairly fast x 4 over 3 octaves
QUOTE(Solari @ Oct 28 2009, 08:51 PM)

I think I've overdone the stretching and have an aching thumb tendon. I'm taking ibuprofen at the moment to hopefully calm it down.
It's the tendon on my palm side to the middle of my thumb..

Is there anything else I should do? I get the idea my doc will just say rest it?
.... just wanted to add hope your hand feels better soon
we are only as strong as our weakest link !!