I am starting to agree with Dr. Hartman.
When I was in Kunming, training with Yoko Shibui and Reiko Tosa, doing some pacing for them on their interval workouts, I could tell how badly they were hurting. They sounded like every breath was their last, gasping for air. They were, to use the words of Dan Browne, "going to the wall" to complete their workouts.
I also observed this same level of pain when I called the split times (during a track training run) for the Sekisui team in Japan a day before I left for Germany. They were all at or near the same high level of pain that Yoko Shibui was during her 3000s.
Jason