# What Is this Field in the Activity Power Tab: "Power @NNN bpm XXXw"?

**URL:** <https://forum.intervals.icu/t/what-is-this-field-in-the-activity-power-tab-power-nnn-bpm-xxxw/3337>\
**Category:** Training\
**Created:** [16 March 2021 07:54 UTC](https://forum.intervals.icu/t/what-is-this-field-in-the-activity-power-tab-power-nnn-bpm-xxxw/3337 "2021-03-16T07:54:49Z")\
**Posts on this page:** 1\
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**Author:** ![Olly\_Thomas](https://forum.intervals.icu/user_avatar/forum.intervals.icu/olly_thomas/32/28972_2.png) [@Olly\_Thomas](https://forum.intervals.icu/u/Olly_Thomas)\
**Post date:** [16 March 2021 11:17 UTC](https://forum.intervals.icu/t/what-is-this-field-in-the-activity-power-tab-power-nnn-bpm-xxxw/3337/2 "2021-03-16T11:17:43Z")

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Hi Alex,

Not sure I have all the answers, but I think:

- More likely to align with LT1 in the 3 zone model
- Subject to the above being correct, LT2 is close to FTP/CP
- I track the information over time to see if I am increasing my aerobic base (narrowing gap between LT1 and LT2)
- If LT1, in the 3 zone model then this would be a beneficial place to spend time during an “endurance ride”
- I use the HR vs Power graph in the compare functionality to review increase in aerobic base over time

 ![image](https://forum.intervals.icu/uploads/default/original/2X/e/e608d121c88195c0c3e6a874790987e4fbc161f2.png)

Good thread here that talks about LT1 etc and its alignment to 7 zone model etc including some good links to an excel to show your estimated LT1 etc: [Mapping 7 Zone to 3 Zone Model Wrt Polarized Training](https://forum.intervals.icu/t/mapping-7-zone-to-3-zone-model-wrt-polarized-training/3090)

My 2 cents 🙂

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