Zion - You're right in the sense that, in broad terms, if you burn up 20 miles worth of fat out of the 500 available then the fat reserves have been reduced by 4%, the body has no great need to send hunger pangs to frantically replace the used fuel. However, use 20 miles worth of glycogen and thats near enough 100% depletion which needs replacing quickly, hence the hunger pangs.
Even MP + 15-20% is going to cause a good deal more hunger tham MP + 25%.
Duckinator - Cant help you with that one I'm afraid as I've never had a heart rate monitor. All I measure is the end pulse immediately after a session just so that I've got a like-for-like comparison to judge progress and spot warning signs over time.
If end pulse readings are a reasonable approximation of heart rates then I have some quite strange readings. As examples:
A 6x1000m session at just over 5K pace on Tuesday, End Pulse 134.
A short MP run yesterday, End Pulse 108
A long MP+25% run, End Pulse 80
But I know from doing lots of these sessions what they should feel like, ie perceived effort. I dont know whether I would gain from having access to HR data or whether it would confuse the issue?
You will probably find that Barnsley Runner has a lot more knowledge re training to heart rates.......
Edited: 30/04/2010 at 11:58