Mismatched run load between pace, power & HR

There is a mismatch in estimated load when building a run workout based on power, pace & HR metrics.

The following are the syntax for separate workouts and their estimated loads:

  • 1h 80% Pace
    (load=64)

  • 1h 80% power
    (load=64)

  • 1h 80% LTHR
    (load=45)

  • 1h 80% maxHR
    (load=64)

Given that the percentages for power and pace are based off the threshold value, I would have expected the LTHR workout to be roughly the same and for the MAXHR workout to be significantly higher but the MAXHR one is identical to the power and pace ones.

I understand that different algorithms may be being used for the different metrics but given the maxhr load is identical to the pace and power, this seems like a bug.

Thanks.