I know heartrate threshhold is not as good as power to compare your maximum capability to. However, I’ve been doing TR since November. Before November I was fairly certain my LTHR was 169 beats or close to it. I based that on that “feeling” you get that causes you to look at your computer and you see the same heart rate over and over. That may not be a good way to gauge it, but all the time I thought it was 169 and that LTHR was nearly impossible to move AND that you could only sustain 2-5 minutes above LTHR. I just completed Mount Goode and spent over 15 minutes above 170 and probably 10 minutes straight at the end between 175 and 177.
Is my LTHR going up? or did I just underestimate it?