I was wondering if this is just a sign of deconditioning. I have been having a heavy chest feeling, palpitations that are made worse by intense exercise (during and especially after).........During my stress test I could not go longer than 9 minutes and they told me my target heart rate was 171 as I am 30 years old, but I watched the monitor and i saw it eratically jumping as high as 220 and then falling back (bad reading? i dont know), anyway I fizzled out after only 9 minutes and thought i didn't have any palpitations that time, the doctor told me i was just out of shape and not to worry about the palpitations or anything else, just to exercise and lose weight (im 30 yrs old, 60 lbs over weight). I hav been avaoiding exercise due to my palpitations, but none got picked up, though he just said not to worry about them. Is this likely just deconditioning?