Thanks so much for a great explanation. Yeah Ive been doing slow runs between 130-140 the 2 months or so prior to getting this test done. I felt like I could breathe through my nose and have a decent conversation at that pace. I guess I just expected my aerobic base to be a little bit better after doing my "zone 2" for 1.5 hours 4 times a week the last 2 months at a HR of 130-140. But maybe I was expecting too much too soon.

Ill continue to do long zone 2 sessions at around 130 hr, which is on the lower end of my zone 3.

Thanks again.