Originally Posted by
Carbonfiberboy
However, the graph points out that at 85% of VO2 max intensity - which for an elite athlete corresponds to FTP, roughly - we're talking about 2/3rds of energy being derived from carbohydrates. That's basically means that high performance cycling and not eating sufficient carbs are mutually incompatible.
(That elite athletes burn more fat across all, but especially higher intensities than untrained or moderately trained people isn't entirely new, by the way - but I haven't read any real studies which suggest there's any significant amount of fat burned at 100% of VO2max at all)