Ok, i tried googling this, and I will ask one of the trainers at the gym, if I can ever get their attention, but maybe someone else experiences this...

It seems when my heart rate gets above a certain point (and I know I'm well into the anerobic zone), I get sharp, achy pain right under my right shoulder blade. It goes away once my heart rate goes down.

This happens both when I'm moutain biking, or if I'm on a machine at the gym.

Anyone else ever have this happen?