Bus, that's a really good pace given the circumstances.
When I first joined the club and ran under a different coach more geared towards beginners, I ran the reps at actual 10K pace, as per his instructions. However, I used to end some of them feeling far too fresh for my liking. Having said that, I was improving then as well, so who knows who's right. I do know that running short reps like 400s at 1:22-1:23 pace (i.e. 10K PB pace) would feel incredibly slow.
I also have doubts about whether it would be much benefit to get used to the feel of race pace by running on the track. When doing reps/intervals, 10K pace on the track feels quite a lot easier than 10K pace on the road does. When I do reps on the road I do try to do them at 10K race pace, because it feels the same effort level (and I also use the same course as one of the local 10K's, so it's excellent practice for that particular race).
Not that I know anything about physiology, but if pushed to guess, I would have thought that the train fast to run fast approach advocated by Dean would be even more applicable to those on a plateau, who have more than enough practice at running at their race pace - that's the problem! But clearly, as shown by SG recently, the pace zone approach is working.
Anyway, my total ignorance in these matters is why I generally just shut up and follow the coach's sessions...
Edited: 17/01/2013 at 15:22