# Is the formula for load from HR public domain? **URL:** \ **Category:** Uncategorized\ **Created:** [24 December 2025 03:00 UTC](https://forum.intervals.icu/t/is-the-formula-for-load-from-hr-public-domain/118072 "2025-12-24T03:00:46Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![pepe](https://forum.intervals.icu/user_avatar/forum.intervals.icu/pepe/32/36539_2.png) [@pepe](https://forum.intervals.icu/u/pepe)\ **Post date:** [24 December 2025 05:05 UTC](https://forum.intervals.icu/t/is-the-formula-for-load-from-hr-public-domain/118072/2 "2025-12-24T05:05:21Z")
Check following announcement. > [@HRSS (normalized TRIMP) training load](https://forum.intervals.icu/t/hrss-normalized-trimp-training-load/569): > > You can now choose to estimate training load for activities with heart rate data only (no power) using HRSS (normalized TRIMP) as used in [Elevate](https://github.com/thomaschampagne/elevate/issues/341#issuecomment-322047898). You can also have different settings for cycling and running (and other sports). HRSS works better for running than the cycling derived models. You need to capture your resting HR and a good threshold HR for HRSS to work well. HRSS is now the default model if there isn’t enough data to build the others. This cha… and > [@\[Solved\]HRSS caculate problem](https://forum.intervals.icu/t/solved-hrss-caculate-problem/67039): > > @david below is my work informationn [https://intervals.icu/activities/i39563575](https://intervals.icu/activities/i39563575) work trimp is 301.8749 { "type": "HRSS", "icu\_training\_load": 170, "data": [], "resting\_hr": 46, "lt\_hr": 178, "max\_hr": 196, "rSquared": null, "trainingDataCount": 100 } I caculate work hrss by [Elevate](https://github.com/thomaschampagne/elevate/issues/341#issuecomment-322047898) methord as The difference between the calculation result 164.9035 and the icu result 170 is a bit big I’m not sure what’s wrong --- _[View the full topic](https://forum.intervals.icu/t/is-the-formula-for-load-from-hr-public-domain/118072)._