Originally Posted by NoRacer
If you could be tested daily, you would find that your LT heart rate changes daily (actually it changes more often depending on your current metabolic status, which is influenced by environment, rest, hydration, stresses). This is why a powermeter is much better. It's not influenced by any of those factors. It's a non-idiosyncratic metric compared to heart rate.
My tester commented on that as well, it's on the list of things to get. I had just bought a cadence computer, didn't know enough to get the power meter instead.
