30r20 80% HRR - post running marathon

So managed to get the 30r20 in this morning (completed the running marathon on Saturday so a little sore but not too bad) decided to aim at 80% HRR (160 bpm) and was blowing good and had a lovely sweat on - result was 8098m 1:51.1 pace ave 151 bpm max 164 bpm TE 3.1