Aerobic Decoupling During/Across Intervals?

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Anyone know of any good resources relating to aerobic decoupling during intervals. For example, this is screenshot of a 5x5min @FTP:
image

There’s a general decrease of Power:HR across and within intervals. Does this indicate they are stretching for the athlete?

Thanks!

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You can’t really use that for short intervals. You’re starting every hard interval with a lower HR because of the rest periods and that skews the number. It takes a couple of minutes for your HR to stabilize.
It’s only valid for longer endurance work.
I tend to compare avg HR and HRmax for each interval to check if I’m improving and if it is time to up the power.

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Wondering how short is short! Could it be possible to ‘score’ latency/lag over subsequent, identical sessions to see if HR response is quicker to the onset of load?

For example: Week 1 - going from 150W to 300W, HR takes 90sec to stabilize @ 150 bpm; Week 2 - takes 60sec to stabilize @150 bpm.

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Improvements will look more like this: week 1 stabilizes at 150bpm - week 4, stabilizes at 146bpm. Then you could add some watts to up the intensity.

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