# Intervals.icu FTP vs. AIFTP- Huge difference

**URL:** <https://www.trainerroad.com/forum/t/intervals-icu-ftp-vs-aiftp-huge-difference/86785>\
**Category:** Training\
**Created:** [September 12, 2023, 5:34pm UTC](https://www.trainerroad.com/forum/t/intervals-icu-ftp-vs-aiftp-huge-difference/86785 "2023-09-12T17:34:55Z")\
**Posts on this page:** 4\
**Page:** 3

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**Author:** ![downhiller](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/downhiller/32/9011_2.png) [@downhiller](https://www.trainerroad.com/forum/u/downhiller)\
**Post date:** [April 5, 2024, 7:33pm UTC](https://www.trainerroad.com/forum/t/intervals-icu-ftp-vs-aiftp-huge-difference/86785/50 "2024-04-05T19:33:08Z")

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I did manage to average 284W for 47 minutes up a climb today (and then do another hour after it). By no means a full-bore effort, but certainly “hard”. I think 300ish feels right 🤷‍♂️

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**Author:** ![BillyWaldman](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/billywaldman/32/122094_2.png) [@BillyWaldman](https://www.trainerroad.com/forum/u/BillyWaldman)\
**Post date:** [April 5, 2024, 9:40pm UTC](https://www.trainerroad.com/forum/t/intervals-icu-ftp-vs-aiftp-huge-difference/86785/52 "2024-04-05T21:40:29Z")

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Youre so old school

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**Author:** ![Twowkg](https://avatars.discourse-cdn.com/v4/letter/t/ce7236/32.png) [@Twowkg](https://www.trainerroad.com/forum/u/Twowkg)\
**Post date:** [April 5, 2024, 9:56pm UTC](https://www.trainerroad.com/forum/t/intervals-icu-ftp-vs-aiftp-huge-difference/86785/53 "2024-04-05T21:56:34Z")

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Doing ftp test is too scary. Much better to guess and hope you get it right.

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**Author:** ![grwoolf](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/grwoolf/32/7725_2.png) [@grwoolf](https://www.trainerroad.com/forum/u/grwoolf)\
**Post date:** [April 5, 2024, 10:08pm UTC](https://www.trainerroad.com/forum/t/intervals-icu-ftp-vs-aiftp-huge-difference/86785/54 "2024-04-05T22:08:26Z")

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> [@JSTootell](#):
>
> Just do an FTP test.

You make it sound simple, but which test…? So many definitions and protocols to choose from.

I actually find TR AIFTP surprisingly close to my perceived FTP. Intervals.icu requires a max effort and typically sits significantly lower since my training/racing seldom includes an “all out” interval.

With some over/under work and high sweet spot training, I typically know where my threshold sits within ~5-8 watts. I’ve done lab testing a couple times with blood lactate monitoring and I’ve been really close to my “perceived” number. With experience and reasonably fresh legs, it’s pretty easy to dial it in and feel the cross-over point as you exceed threshold and start digging a hole. I also subscribe to treating threshold as a physiological state (MLSS), not the squishy 40-70 minute or “about an hour” definitions.

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