The HR formula is more about diagnostic tests that doctors do on you. Why it got into the cycling community is understandable, but the fact that people ever lent it credence for the cycling community is a mystery.
Your HR compared to another person means nothing. Your max HR means nothing. What means something is the most HR that you can maintain without bonking or taking too long to recover to do the next hill or sprint.
Like others, I recommend setting your zones by LTHR or FTHR. If you have a power meter, forget HR and use FTP.
Last edited by Iride01; 07-06-21 at 02:28 PM.