# Intervals.icu FAQ

**URL:** <https://forum.intervals.icu/t/intervals-icu-faq/123707>\
**Category:** Guide\
**Created:** [3 March 2026 07:29 UTC](https://forum.intervals.icu/t/intervals-icu-faq/123707 "2026-03-03T07:29:24Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![R2Tom](https://forum.intervals.icu/user_avatar/forum.intervals.icu/r2tom/32/50144_2.png) [@R2Tom](https://forum.intervals.icu/u/R2Tom)\
**Post date:** [3 March 2026 07:31 UTC](https://forum.intervals.icu/t/intervals-icu-faq/123707/3 "2026-03-03T07:31:09Z")

</div>

# FAQ: FTP & Zone Settings

## How to setup FTP History?

FTP in Intervals.icu is copied to each activity. If you change FTP today, old activities are not automatically rewritten.

Best practice:

- Open Activity List and show the FTP column.
- Set/correct FTP values for the relevant date ranges.
- If many activities are affected, use bulk edit on the activity list view (`Edit > Edit`).

Links:

- [How to change FTP History? - #23 by Gerald](https://forum.intervals.icu/t/how-to-change-ftp-history/2735/23)

## Why is my Heartrate clipped?

Usually this is caused by max HR / HR zone settings that are too low (or historically inconsistent).

Fix:

- Update max HR and HR zones.
- Apply the correct values to the relevant time period.

Links:

- [Change max heartrate](https://forum.intervals.icu/t/change-max-heartrate/2280)
- [Heart Rate spikes](https://forum.intervals.icu/t/heart-rate-spikes/3982)

## Why is my Power clipped?

Most often power clipping is caused by spike settings: values are detected as unrealistic spikes relative to current thresholds.

Fix:

- Set a realistic FTP (also check sport-specific FTP).
- Increase power spike threshold if genuine peaks are being cut.
- Re-analyze affected activities.

Links:

- [FTP and Power Spikes](https://forum.intervals.icu/t/ftp-and-power-spikes/170)
- [[SOLVED] Power not showing correctly(Ans: Update Your FTP / increase the Spike % Threshold)](https://forum.intervals.icu/t/solved-power-not-showing-correctly-ans-update-your-ftp-increase-the-spike-threshold/119616)

## Why does eFTP look inconsistent, wrong, or not update the way I expect?

**What to do:** Treat eFTP as a suggestion, not an automatic truth. If the estimate looks wrong, do not accept it. Your previous FTP stays in place until you explicitly accept a new value.

**Representative solved threads:**

- [SOLVED: Glitch in the eFTP calculations](https://forum.intervals.icu/t/solved-glitch-in-the-eftp-calculations/128485)
- [[Solved] Updating FTP from eFTP is not working](https://forum.intervals.icu/t/solved-updating-ftp-from-eftp-is-not-working/117624)

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