# Stephen Sieler on cardiac drift, power/HR and so on **URL:** \ **Category:** Feature Requests\ **Created:** [23 April 2020 14:39 UTC](https://forum.intervals.icu/t/stephen-sieler-on-cardiac-drift-power-hr-and-so-on/734 "2020-04-23T14:39:55Z")\ **Posts on this page:** 1\ **Showing post:** 5
**Author:** ![Bogdan\_Rylski](https://forum.intervals.icu/user_avatar/forum.intervals.icu/bogdan_rylski/32/27000_2.png) [@Bogdan\_Rylski](https://forum.intervals.icu/u/Bogdan_Rylski)\ **Post date:** [23 April 2020 22:44 UTC](https://forum.intervals.icu/t/stephen-sieler-on-cardiac-drift-power-hr-and-so-on/734/5 "2020-04-23T22:44:33Z")
It’s a deep rabbit hole that I’ve been going down lately. I’m looking forward to watching the new video. > [@Aerobic Tracking](https://forum.intervals.icu/t/aerobic-tracking/702): > > I have an idea for a graph that would track W/HR ratio over time but also have the ability to include data based on the power zone. For example, include only Z2 efforts of 20min or longer. I find myself going back and forth between workouts and using the slider tool on the aerobic chart to get W/HR for my endurance rides, so it would be nice to have it all in one place. There is a similar graph on Wko4 but the graphics are painful to look at, and I’m not sure if there is any criteria for data i… --- _[View the full topic](https://forum.intervals.icu/t/stephen-sieler-on-cardiac-drift-power-hr-and-so-on/734)._