Originally Posted by Classtime

I've got a long hard event planned for the end of April (just before I turn 66) and will be turning the clock back to when I did some serious training. I will be approximating FTP and set my training zones using HR as I did 20+ years ago. I have a question for those who once set training zones using HR and switched to setting and monitoring zones using power: When you switched to power, how much did the zones change? When you first did your test using a power meter, was your HR for each zone much different than setting with HR only? I probably won't $pend for a power meter but I have been thinking about it.