Thanks David and Wojciech,
My graph was a little broken because my heart rate device went crazy one windy day and messed everything up, the graph did not make sense to me and but now I have updated that ride to ignore heart rate data and now I can make use of the graph. Very cool graph.
I have calculated my LTHR to be around 173 from race results in previous seasons but have not yet done such a hard one hour effort to see my LTHR for this season (or I do not have the muscular endurance yet), but I see a pretty high 30min heart rate of 176.
( I will now delete my current season start to see how my curve looks for previous season)
Edit, deleted season start and seems like my LTHR might be two beats higher than I thought at 175, but that day it was very hot so not sure it it counts.
