Originally Posted by
nikalas
You're bouncing all over the place here CL... I never mentioned movement when talking about economy, it was you who made that leap, I was referring to utilisation of fuel types. This is easily measured by gas analysis on a sub-maximal treadmill test and shows the point, relative to exertion, where the athlete is no longer able to use fat as a fuel and carbohydrate metabolism takes over completely. Take an ultra-runner and, because of the disciplined long slow distance work they've done, they will be able to maintain a degree of fat metabolism at a much higher level. This has obvious implications for distance running as you can only assimilate a relatively small amount of carbohydrate on the go so, unless you can tap those fat reserves, you'll come to a grinding halt. Distance runners develop their ability to utilise fat with long steady base work. It's essential to their performance so isn't junk.