In conventional performance assessments there is usually only one single benchmark - a VO2max, FTP or threshold value - available. Therefore training zones can only be determined by extrapolating from this single benchmark - for example 70% of FTP is supposed to be base training, 115% VO2max.
But with INSCYD you get a holistic view on the performance of the athlete, containing several performance benchmarks, such as: anaerobic threshold, VLamax, VO2max, FatMax, etc. Therefore all Training Zones are not longer extrapolated but derived from its "master metric". For example: FatMax Zone is based on the maximum fat combustion rate, VO2max is based on the actual VO2max of the athlete.
Because the physiology of each athlete is different and changes by training, the intensity at which maximum fat combustion as achieved, VO2max is elicited, etc. can be different. Therefore the training zones derived from such physiological benchmarks differ and can be either "further apart" or closer to each other or even overlapping.
With INSCYD this is different. You now have many more metrics in your hand than just one benchmark. Therefore all training zones are based on their "master metric":
recovery and base training are based on the fat and carbohydrate combustion
FatMax Zone is based on the fat oxidation rate
Anaerobic threshold zone is not based on some empirical threshold concepts but on the equilibrium of lactate production and combustion
aerobic maximum - based on the VO2max
anaerobic zone - based on energy derived from the anaerobic metabolism.
Here is how the training zones in INSCYD are calculated:
