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The question is which is how well an hours XC racing equates to a 20minute FTP as a testing regime. HR just to illustrate the intensity.
AdsH-
ah that makes a bit more sense then.
I seem to recall there being something in the Coggan/Allen book about the demands of XC races.
I would think that your normalised power (not average) for the 65mins should be close to your FTP
I presume you mean CP20 (which is then used to extrapolate FTP) rather than 20min FTP - FTP being the average power for ~1hr
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http://alex-cycle.blogspot.co.uk/2008/05/the-seven-deadly-sins.html
"the seven deadly sins....
...er, ways of determining your functional threshold power (roughly in order of increasing certainty):
1) from inspection of a ride file.
2) from power distribution profile from multiple rides.
3) from blood lactate measurements (better or worse, depending on how it is done).
4) based on normalized power from a hard ~1 h race.
5) using critical power testing and analysis.
6) from the power that you can routinely generate during long intervals done in training.
7) from the average power during a ~1 h TT (the best predictor of performance is performance itself).Note the key words "hard", "routinely", and "average" in methods 4, 6 and 7..."
danb
hippy
apples and oranges - you can't compare HR to power - at least without knowing what power you put out for a given HR and even that is wildly variable.