Originally Posted by DannoXYZ
Probably did closeto the same. The amount of power required to do the loop was probably the same provided you both weigh the same and block the same amount of air. Then the calories burnt translates from roughly a 18-20% efficiency.
But, did you both do this ride in exactly the same gearing? Looks like you may have pushed bigger gears than her, thus taxing your muscles a little more relative to your HR. Whereas she may have used lower gears, spun more to save her legs and taxed her aerobic system more.
Next time you do this exact same loop, try spinning easier gears yourself and you'll see that your HR will be higher. Since you both were doing this at sub-maximum (sub-LT) efforts, there's a lot of leeway we can have in adjusting HR and muscular-efforts up & down in a criss-cross fashion for the same power-output and calories-burnt.
Hike, Danno,
hike. Very similar cadence.
But that's what I've suspected - calorie burn about the same, since work accomplished is about the same. She just has to exert more to burn the same calories.