Using HR to Calibrate Power | 80/20 Endurance

Using HR to Calibrate Power

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  • #11295

    Just curious if anyone else has done or experienced this. I’ve been rebuilding since early November, after missing quite a bit of time from injuries. On my most recent CP test, I did quite a bit better than expected. However, incorporating my new power (Stryd) training zones didn’t very well. On most of my easy runs, I felt like I was pushing too hard. This was especially true on the long runs.
    Plus my heart rate was consistently higher than it should have been. This was leaving me fatigued.

    I decided to take 3 weeks and run by heart rate. Obviously, there can be statistical outliers, but I figured this would give me a pretty good idea of where I should be on the easy runs. Then, I recalibrated my easy run target and started running by power. As I see my heart rate at this effort starting to drop, I’m gradually bumping up the target. It seems to be working really well. I’m improving and I’m not fatigued.

    Has anyone else done this?

    Matt Fitzgerald

    The issue previously has been that critical power was treated as identical to rFTP, when it’s really not. By definition, rFTP is the highest wattage a runner can sustain for 60 minutes, whereas CP is closer to a 30-minute max power. but I’m happy to report that this discrepancy has been addressed with these new guidelines from Stryd:

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