Here is my heart rate for the McAllen Marathon that I used as a training on Dec 11, 2011
Here is the one from Houston Marathon Jan 15, 2012 almost a month from McAllen I should have been able to run 5:38-5:40, but the concrete in Houston trashed my legs by mile 12. I posted the comparison because everyone asked me why didn't I run between 2:28-2:34. So I decided to post my heart rate of the two marathon in less than 34 days, I couldn't have been glycogen depleted by 12 miles, I should've DNF, but I've never dropped out of a race so I decided to finish it.