Since I recently began training with power via my Wahoo Kickr, I'm trying to zero in on which metric would be more accurate for estimating my calories burned. The numbers are way off. If I were to go by HR for an easy ride, I'd probably be at around 350kcals burned. With power, It has me at close to 700. I'm leaning more towards HR as being more accurate, but was hoping someone better tuned into exercise physiology may be able to weigh in.
I have a basic understanding of the conversion of watts to KJs to Kcals. But what happens when you take a strong rider who can easily sustain 300 watts for a long duration and then compare myself, who at 300 watts will probably be pushing above my FTP? Over 40km my HR will be jacked and he will probably be riding comfortably, so shouldn't I be burning more calories as my lungs/heart will require more energy to keep me going?
I have a basic understanding of the conversion of watts to KJs to Kcals. But what happens when you take a strong rider who can easily sustain 300 watts for a long duration and then compare myself, who at 300 watts will probably be pushing above my FTP? Over 40km my HR will be jacked and he will probably be riding comfortably, so shouldn't I be burning more calories as my lungs/heart will require more energy to keep me going?