My bet would be "none". Because, I expect your "go to" RPE / HR will remain unchanged and you will simply run faster at the same "pay no attention" effort. But, I'll take a wild guess and say your pace drops down in the 8:2x range by the end of the challenge at 152 bpm.
On the other hand, if you do continue to run at 9:00, I'll pick 141 as the associated HR.
On the other hand, if you do continue to run at 9:00, I'll pick 141 as the associated HR.
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Tom_hampton: Dec 5, 19 11:56