Stewart - difficult to say, but my guess is the pace was dropping a little so that probably kept it flat
Dr Dan that may well be the key - my subLTs were getting worse in the last 4 weeks before Frankfurt, so early peaking may well be the issue for me too. Treat yourself to those missing 7 seconds at the Leeds Half !
Nayan that subLT / MP connection is the subject of some debate. The best answer for me was from Paul on the Fetch Hadd thread:
"My approach is that my sub-LT 10-milers just gradually 'evolve' in to MP 10-milers. I start them off in the base building phase at about 80% maxHR, and by the end of the specific marathon training phase they're at about 85% maxHR.
I probably improve by 50-60sec/mile during that process. About half is probably due to using more bpm, and about half due to improving fitness.
The pace that I see for that 85% is then pretty much my goal race pace. By the time the kitchen sink goes in then race HR average might then become 86-87. But it will have sat at 84-85 for much of the race."
I have never managed to flat-line for 10 miles above 83%, so I tend to stick with my average subLT at 83% as "MP". Or I chicken out and add 15 seconds to it....lol
7.8m easy for me this morning. Another subLT tomorrow...