My right hand gets hypoxia and gets tired easy

[malcolmwiss]

When im playing fast and alot it feels as if my hand gets hypoxia.
I've went to two doctors and both said that i should rest it for a week.
I did it and a bit more, went on a trip.
Playing again now, it still occurs and i assumed that some of you pianist may have experience something like this or knows anything that can help me.

My teacher says the problem does not lie with my positioning.

[faulty_damper]

By hypoxia, you mean low oxygen?  How do you even know this?  Did you use an oxygen meter?  Is your blood more bluish than red?

Move your elbow away from your body.

[indianajo]

If your teacher is sure your position is right:
Piano is a physical skill.  Building muscle and blood capacity involves minor pain.  The more you do it, the more strength you get.  I never practiced over an hour as a student, that was the deal I had with my Mother paying for the lessons and hauling me across the freeway in a car.  But I did some intense exercises my first year. Schmitt exercises in the Schirmer book, which are not difficult technically but stress the muscles, quite a bit, especially fingers 4 and 5.  It was good for me, required skills I never had with my fingers. 
But if you are getting tendon or joint pain in your teens or youth,  consult with your teacher.  Resting a week is not any kind of muscle building program, however.  Same as any other muscle, if you don't use it the same amount at least every other day, you lose strength, not build it.  I practiced an hour a day six days a week when I was a student.