Lots happening here: new bikes being built, new routes being ridden, massive snowfalls accumulating, etc. More on all that later.
Here's my immediate debate: caloric expenditure.
I'm using Livestrong.com to count calories. I won't entertain arguments about that. It works for me. So that's my major premise: counting calories using an online food diary is a good way to slowly lose bodyfat.
Here's the minor premise: recording calories burned helps me determine how many to consume each day.
I have a good sense of my resting metabolic weight. But using my Garmin Edge 500 with my new Powertap is yielding some conflicting data. So, powertap-addicted numbers junkies, here's my question:
After a 75-minute easy spin (zones 1-2), the Garmin tells me that I've burned 647 calories-- but expended 755 kilojoules. Which number should I use to calculate the ideal caloric consumption for that day? Sometimes, the calories burned is higher, especially if I'm really rested, fed, and hydrated. On the other hand, if I'm fatigued or slightly dehydrated, my heart rate is lower for the same effort, and hence the calories burned number is lower. But power is power, no? Shouldn't I record kilojoules expended, regardless of heart rate?
Thoughts from all are welcome: but don't tell me to stop doing the math or that powermeters are dumb.