Originally Posted by
Trakhak
There seems to be a consensus among researchers that aerobic exercise performed in zones 1 and 2 (using the 5-zone scale) burns fat almost exclusively, whereas exercise in zone 3 and above burns carbs at a rate that increases as the effort increases.
Here is the proof of that, at least for me, now.
I had a VO2Max test where is cycled with a breathing tube analyzing my breath at increasing load. What I see confirms, that around 140-145 I switch from burning mostly fat to carbs. That resistance value, which I assume is watts, is my Zwift measured FTP. At max HR of 163, no fat, all carbs and probably a few brain cells too.
