question for the Ex. Phys. boffins

[rmur17]

I was looking at some historical CP-Monod testing of mine and a question came to mind re AWC at the longer durations.

If one performs a 1-hr isopower test or TT right at current FTP and assuming that FTP is well established, is any AWC consumed or utilized?

 

[frenchyge]

Wouldn't it *all* be utilized? Typical AWC values could contribute ~3-7w over a 60-min duration.

That 3-7w represents the difference between critical power and FT power, no?

 

[rmur17]

Wouldn't it *all* be utilized? Typical AWC values could contribute ~3-7w over a 60-min duration.

That 3-7w represents the difference between critical power and FT power, no?

well I'm also thinking of the advice that FTP is taken as CP from the CP-Monod test and not CP + AWC/3600.

I have no axe to grind ... just wondering about what feels like a small discrepancy.

 

[acoggan]

well I'm also thinking of the advice that FTP is taken as CP from the CP-Monod test and not CP + AWC/3600.

I have no axe to grind ... just wondering about what feels like a small discrepancy.

In theory, the maximum power you could generate for 60 min - IOW, your functional threshold power - should be equal to (critical power + anaerobic work capacity)/3600. However, such calculations typically entail extrapolating from the power that can be maintained for <3600 s, and the work-time relationship isn't really linear. Thus, in practice functional threshold power is usually closer to the slope of the work-time relationship itself, i.e., critical power. Or, to put it another way: ignoring the small contribution from anaerobic work capacity over a full hour automatically helps compensate for the tendency of the critical power approach to overestimate the power that can be maintained at longer durations.

 

[rmur17]

In theory, the maximum power you could generate for 60 min - IOW, your functional threshold power - should be equal to (critical power + anaerobic work capacity)/3600. However, such calculations typically entail extrapolating from the power that can be maintained for <3600 s, and the work-time relationship isn't really linear. Thus, in practice functional threshold power is usually closer to the slope of the work-time relationship itself, i.e., critical power. Or, to put it another way: ignoring the small contribution from anaerobic work capacity over a full hour automatically helps compensate for the tendency of the critical power approach to overestimate the power that can be maintained at longer durations.

okay I understand. Recent training/testing results yield a CP of 376W and an AWC of 19000. Taking CP + AWC/3600 predicts 382W for the hour and I'm darned sure I can't hit that (at least indoors )

Around what duration would you suggest to start derating the AWC component. Maybe downrate it linearly starting around 20-30 min duration (100%) to 0% contribution at 60min?

thanks