TTE estimate from FTP interval workout

Hello, this is a feature request / physiology question. I’m wondering if an FTP interval workout can be used to generate an estimated TTE at FTP; if so, maybe this could be a secondary TTE field.

To explain what I have in mind, I’ll use recent 3x15 at FTP workout of my own (see screenshot attached).

  • In the first interval, my HR peaked at 173. Count that as 15 minutes.

  • In the second interval, my heart rate reached 173 after about 5 minutes, and then eventually climbed to 180. Count that as 15 - 5 = 10 minutes, since the internal physiological state (173 HR) after 5 minutes was comparable to the state at the end of the first interval.

  • In the third interval, HR returned to 180 after about 5 minutes (ignoring spikes), so add another 15 - 5 = 10.

By this method, the TTE estimate would be 15 + 10 + 10 = 35 minutes. This sounds reasonable to me. Of course, doing 35 minutes straight through might be mentally tougher since you don’t get a break; on the other hand, one might rise to the occasion knowing it’s a test rather than a workout.

I’m curious to hear how people feel about this as an estimate of TTE, and if it could be coded into intervals.icu as a new feature.

(Separate question: if my lactate threshold heart rate is around 178-180, does this sound like a correctly calibrated threshold workout?)

Is the TTE on the performance side not what you want or do you want a TTE for every activity?

TTE on the performance side is great, but I do these workouts more often than full blown tests, so tracking an estimate more frequently could be helpful. I’m really just throwing it out there to hear if people think this is a metric worth looking at.

Since I only run an FTP test irregularly (20 minutes), this value is not that important to me. But I understand your wish. :+1:

Take a look at this diagram - maybe what you are looking for


W’ Plot (Veloclinic Plot)