The calculator is an approximation not a 100% accurate simulation but it is intended to be useful when fed with realistic inputs.
The simulation is intended for people who are looking for a general overview on food, exercise and bodyweight rather than elite level athletes looking for a tool to use as part of a training plan or someone looking for something that is so accurate that it can be relied upon to lose weight.
Probably the first thing that you will notice is that the calculator uses blood glucose and glycogen interchangeably, this is clearly inaccurate but only has any real effects if you set up a calculation that deliberately goes into glycogen depletion and exercises in that state.
On the same theme, ketosis is an area that the calculator simply pretends does not exist, the calculator starts off with around 1,400kc of glycogen and has a maximum period of 5 days, so ketosis could be triggered. So if in the real world you do a week of a no carbs diet and then compare your results with the calculator there will be little similarity.
But how many people are going to want to do this?
Glycogen on the other hand is processed with a reasonable degree of reality, there is maximum capacity of around 1,800kc and when exhausted the specified exercises are changed to a reduced intensity.
When alcohol is consumed it enters the blood stream very quickly, the exact speed being affected by the type and quantity of food recently eaten. The calculator then shows the blood alcohol numbers rise and fall (the mg/100m values) but the energy (kc) derived from the alcohol rises and falls out of sync with this.
This is correct as the energy derived from alcohol comes as it is processed and this takes time. Note also that alcohol derived calories are used in preference to either glycogen or fat and that the presence of alcohol in the blood stream slows the processing of other food items.
The exact balance of fat and glycogen used during exercise is varied by collecting an approximation of the user's fitness level and the intensity of the exercise.
Again this is an approximation, if you do a ride on a TT bike wearing a skinsuit you will use less energy for a given speed, but do you want to answer all the questions necessary to calculate this. Especially as today's wind was at 8.5mph not the 10.5mph that you thought it was, so the results are wrong anyway.
Energy expended is based on a 25% bodily efficiency.
There are two planned to-dos
- Add in support for ketosis.
- Add in post exercise recovery.