Hi,
I’m a bit confused about my Xert-calculated LTP and TP. Currently, it shows LTP at 291 W and TP at 328 W. It seems a bit overexaggerated, as I’m not really able to ride in Zone 2 at this intensity. Additionally, my blood test showed the lactate 1 curve to be close to around 260 W.
Should I trust Xert’s calculated values and train based on its suggested workouts, or should I adapt the intensities more and stick to my blood test and RPE values?
Many thanks,
Matej
LTP=TP-HiE/0,4.
HiE in your signature is (328-291)*0,4=14,8 which seems very very low in relation to your TP.
Your HiE is maybe calculated too low. Push the next breakout until your all-out-power falls down to or below TP. This will give Xert a chance to calculate your real HiE-”tank” as you try to empty it completely. Squeeze out anything you have above TP. Will hurt for sure, but Magic Bucket workouts or 30/30s work nice for that as they are far less difficult in relation to the effort on your peripheral system.
Hi,
many thanks for this quick answer and very reasonable explanation. I totally agree about my current low HIE values, but I also know this number jumps significantly after a race or when i do structure training focused more to anaerobic workout (like 30-30 as you mentioned). Still I’m a bit confused on my current LTP. Do you think it will become more doable if I do anaerobic workouts more often? Or in other words, if I stick more to xert calculated training plan?
thanks again
Matej
LTP is literally calculated using the formula given by @spirit68 while HIE comes from your breakthroughs… could be partly the pattern and stopping too early in a BT as mentioned by @spirit68 but there is also some linkage to PP - if that’s too low eg because you haven’t sprinted all out for a while (or ever) you will likely also have too low HIE which inflates LTP. Do a sprint when fresh to get a good estimate
Personally I find relatively continuous efforts give a more reasonable signature than repeated on-offs - have seen references in the forum to ‘sticky power’ causing distortion (inflation), and from what I’ve read eg from Skiba (and I don’t claim to be an exercise physiologist) I’m also not sure HIE or W’ recovers at the same rate for all (maybe Xert’s three parameters capture enough, maybe not)
Also worth noting that LTP is not an estimate of LT1 (and that LT1 has many definitions anyway)… So question is what you are going to do with that LTP estimate actually? I suggest you just ride endurance at a power you can recover well enough from to really hit your two or three truly hard workouts each week… which also depends how long your endurance rides are… where that sits relative to LTP doesn’t really matter, does it?
Hello,
I see 
Thanks a lot! Still need to learn (a lot) how to read and use this values. 
M
No prob, some of the concepts are new and it can be difficult to find where right material… and then there’s interpreting it which is also not always simple eg you possibly saw this explanation of LTP, and while I’m sure it’s true mathematically, it doesn’t say anything about its relevance for training…there a few forum threads (on various forums) about it and for sure it’s above LT1 for most… and you’ll probably notice that while many Xert endurance rides (inc magic buckets) are linked to LTP, they are generally quite a bit below (and depending on how hard your other days are I personally find it necessary and also fine to go even lower).
Still, it is worth getting your signature broadly right, so a sprint to get a good PP estimate, as well as some good BTs (truly go to failure / no sudden stop) over a couple of durations (short and longer) should set you up well. Then Xert can do a good job tracking / increasing loads and monitoring recovery (though not all aspects so pay attention to how you actually feel), ensuring you get the right focus of high intensity etc.
Thank you very much for your answers. I truly appreciate it.
I’d ride Z2 based more on RPE especially if Z2 doesn’t feel close to your LTP.
If you ride a workout like Lucy in the Sky indoors how much do you need to lower % intensity before it feels like an over/under LT1?
Or free ride this endurance workout and see where the cusp lies in watts.