It's well known that the most optimal exercise for fat utilization/oxidation or simply "to burn fat" should be low intense aerobic exercise where HRavg should not exceed 65% HRmax. In addition doing exercise in fasted state and after high intense anaerobic session should even increase the amount of "burned" fat.
Regular anaerobic activity such as running or cycling does contribute to overall endurance and therefore higher effort is needed to bring HR over anaerobic threshold >65 HRmax (where body switch to carb (glycogen) as main source of the energy).
Based on these two facts, my questions are:
- The higher the athlete's VO2max, the more effort is needed for athlete to raise HR over the 65% HR max threshold. Does this mean that time (during the exercise) spent inside aerobic zone (<65% HR max) will be longer, therefore the body will run for more time using FAT as main source of energy?
- Does this imply that the higher the athlete's VO2max, the more fat they will "burn" during the exercise, for exercise types that are not intended as anaerobic/HIIT training sessions?