# VO2 MAX vs FTP training

**URL:** <https://www.trainerroad.com/forum/t/vo2-max-vs-ftp-training/37482>\
**Category:** Training\
**Created:** [June 9, 2020, 8:42am UTC](https://www.trainerroad.com/forum/t/vo2-max-vs-ftp-training/37482 "2020-06-09T08:42:19Z")\
**Posts on this page:** 1\
**Showing post:** 18

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**Author:** ![SpareCycles](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/sparecycles/32/158128_2.png) [@SpareCycles](https://www.trainerroad.com/forum/u/SpareCycles)\
**Post date:** [June 12, 2020, 12:17am UTC](https://www.trainerroad.com/forum/t/vo2-max-vs-ftp-training/37482/18 "2020-06-12T00:17:26Z")

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Love the nuance here. Can I ask a basic question since we’re on the topic?

Do human muscle fibers exist along a spectrum of “slower” to “faster”, or is there more of like a bimodal fiber distribution that we call I and IIa/IIx?

Any fundamental references I should read up on? Thanks!

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