I downloaded my heart rate data from this Sunday’s race and thought it was interesting enough to share. For reference, I'm 31, my Lactate threshold is somewhere around 170bpm, and my previous max recorded HR was 194. As you can tell from the data, I was freakin pegged as soon as the gun went off and it didn't let up until 40min later at the end. I hit a new max of 199bpm sprinting for a place at the line.
My GPS / HRM file