Darby wrote:
By the way, auto-calculated CP threshold is wildly inconsistent if you're doing any kind of periodization.
I've been consistently gaining fitness last 3 months, progressing from base kind of training to adding some workouts throughout that period. In short, I've been doing all the kinds of workouts that Stryd recommends for correct auto-calculation.
My CP changes:
18.03 266 -> 272 (+2%)
24.03 272 -> 265 (-3%)
01.04 265 -> 266 (+0.4%)
13.04 266 -> 261 (-2%)
17.04 261 -> 262 (+0.4%)
21.04 262 -> 255 (-3%)
24.04 255 -> 287 (+13%)
My real CP was improving all this time! It seems to be very sensitive to individual workouts
Sorry for the double post, but I imagine this reason, is due to certain activities dropping out of the 90 day window for consideration, and the adjustment due to the Anaerobic Work Capacity.
If you're periodizing your training, you're most likely going to be adding intensity as you go on, but the specific addition in your training would be helpful to know here!
Lets say you have this progression of workouts:
April 17 - 10k tempo at 260-265W. Your CP bumps up slightly because this is the longest duration you hold this power for in the last 90 days.
April 21 - You do some 200s or 400s and crank the last one. You push up your short duration contribution, AWC, and it drops your overall CP because of the modeling used.
April 24 - You do a hard 10k at 285-290W and this pushes your CP back up.
The modeling using for calculating the CP value looks at the contribution from three different energy systems, and in turn three main different types of activities.
Your short duration, medium duration, long duration.
If you increase your short duration, and the medium/long stay the same, it is assumed that all values reported at maximal. This would, in turn, push the overall CP value down as the contribution to the model is changed.
There is actually a super cool feature in the online platform, PowerCenter, which will let you see your modeled curve, so you can see if you do have a large drop-off or plateau at certain areas. I hope this explanation helped a bit, but would be glad to explain further!