Please see the image below for a planned few weeks of training. On what is labled as week 2 it shows the projected fatigue for that week to be 49. But, if I add up all the load amounts and divide by 7 I get 60. Why does it seem so off? What am I not understanding. Thank you.
They are calculating 43. But if you add all the loads for the week and divide by 7 you get 60. So shouldn’t the fatigue be 60 for the week if it’s an average over 7 days?
The load is calculated as 414. Which seems correct. Divide that by 7 and you get 59.14. So shouldn’t that be the fatigue?
The calc isn’t that straightforward I believe.
ATLtoday = ATLyesterday + (TSStoday - ATLyesterday)(1/ATL time constant)
It´s a weighted average. Older loads count less because the fatigue from day 1 decays day by day.
Read the information at the bottom of the Fitness page and use the links for more in depth information.
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Thank you!
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Thank you for pointing me to this!
This spreadsheet helps to understand how the daily change of Fitness (aka CTL), Fatigue (aka ATL) and Form (TSB) based on daily input. This is across a full year.
- Start by creating a copy of the file
- Enter the opening CTL and ATL values
- Then change the daily values
This was originally created to show how an effective taper works, but also shows how daily change to training load (TSS) changes the fitness and fatigue values.
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