Originally Posted by
cyclezen
Actually, in your scenario HR is exactly what you need to make good decisions on how to ride what's ahead, especially where the efforts are extended, like a climb or hard, long tempo.
Yes, there is a slight delay in how your system/heart reacts to efforts, but it's just a sec or 2 delay.
The heart rate response delay is much longer than 1-2 seconds. Coggan says it’s on the order of 1 minute.