Hello — I am confused about the definitions of AET. I seems it is defined on this site and in your book as the heart rate at which lactate increases by 1 m mole / liter or rises to about 2. It is also defined in this post and in your book at the crossover point between fat and carbohydrate oxidation. I recently had a treadmill lactate and oxidation test by the Human Performance Lab at Colorado State University, a well respected outfit. My AET by the first definition was far higher than my AET by the second definition. I would be grateful if you helped me to understand this discrepancy because it has substantial implications for my training. If I use the first definition, my AET is easily within 10% of my lactate threshold. If I use the second definition, my AET is probably 25% below my lactate threshold.
Many thanks for your help