Lower altitude sluggishness.
I am trying to figure out if it's just me or there really is an issue. Currently I live in the Ft. Collins, Co area and at about 5000 ft. I don't necessarily "train" hard but I do ride and exercise regularly. My problem is when I travel to the Phoenix area, roughly 1000ft, when I ride I feel totally sluggish and while using a heart rate monitor, my rate is always about 10 bpm more for the same type of activity.
Is there a term for this? I have been looking and I just seem to find info on high altitude training and nothing that addresses this issue in particular.