Quote Originally Posted by Irulan View Post
ditto, I've always been told "the formula" is not accurate at all. I too have done sub max tests.... essentially you warm up for 20 minutes, and then ride at the consistent maximum that you can ride in for the next 20 minutes at a fairly high cadence( 90-100), take an average of your highest HR and then calculate:

http://lwcoaching.com/?p=138
http://lwcoaching.com/trainingplans/levelCalcs.htm
Yeah, the problem with that is I can't ride for 20 minutes at a high intensity. I've had this same discussion with my husband.

Thanks for your comments.