I’m completing an adaption week, so had a low power ‘Andrews’ session. In the last 15 minutes instead of sticking rigorously to the plan, I decided to test this relationship, but would like to know more what it tells me.
I set my Power at 75% and held this rigorously. Over 5 x 3 minute intervals I stepped up the cadence twice then stepped it down twice and let TR monitor my HR. The results:
Cadence - 87 … … 96… … …105… …96… … 87
HR… … 102->112… ->117… . ->123… ->120… ->115
I wasn’t surprised to see the last two HR being a few beats higher than their initial intervals. But don’t understand why the HR rises/falls purely as a result of leg cadence, while power is constant. It seems to imply their is a sweet spot for the cadence/HR/power hence FTP relationship?