pain in left arm

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while playing rage over the lost penny my left forearm begins to get tired from all those chords.  I can't play nearly the whole piece, just up to measure 47 but my arm begins to get tired during the first page.  I must be doing something wrong with my wrist.  whatever i am doing wrong i would like to fix before it becomes ingrained.  Any ideas? I did do a search for this but couldn't find anything about it.

[kghayesh]

Piano playing is a very tedious thing to do for a long time. Therefore, the key to play for very long times without getting tired is relaxation[/u]. Any pain in any part of your playing apparatus indicates that the muscles of this part has been stressed for a long time and need to be relaxed in order to continue moving and producing the same needed power.
To relax your left forearm, you may lift it a bit up the keys and shake it a bit so that you don't feel any momentary stress in yr muscles. It is supposed to be done while you are playing, when there is a passage in which the left hand does not play in, this is definitely the time for relaxation. Lift your hand up the piano and try to shake it so that you feel no stress or building-up tension in it.
Do that everytime you play Rage over a lost penny and you will play all of it without any slight pain !!

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thank you, i will try that.  i'm still not used to playing fast parts for a long time so my muscle there probably needs to be built up too.

[kghayesh]

thank you, i will try that.  i'm still not used to playing fast parts for a long time so my muscle there probably needs to be built up too.

nooooo !
Piano playing is not something that needs powerful well-built muscles! Have you ever heard of someone who goes to the gym in order to build more muscle dexterity for piano playing ??
The muscles of a 12-year old kid are sufficient to play a very hard passage. Just all you need is proper relaxation at the proper times

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haha, yeah your right.  Doens't the muscle get used to being used if not built up.  Like if you go skiing for the first time your legs will hurt but if you do it often and get used to it they won't hurt.  They aren't getting built up but are getting used to doing something they haven't done before.  I guess that is what i meant, not pumping up.