Heart Rate when racing

[Dan B]

jimboalee is talking a surprising amount of sense here.

http://www.brianmac.co.uk/enduranc.htm is good on this kind of stuff too

 

[Crackle]

Pro cyclists don't train exclusively in the anaerobic zone though. It all depends on what the aim is. There's more than one way to develop a muscle and many people aren't aiming to improve their TT times.