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There are a number of approaches to modeling how training changes performance and these models have some obvious value in optimizing a training routine, especially for tapering.
=The Models=
The models assume that given training stress, also known as "[[Training Impulse|training impulse]]" or [[TRIMP]] ('''TR'''aining '''IMP'''ulse), has both a positive and a negative effect. The positive effect is called "fitness", and the negative effect is called "fatigue", and they are combined to provide a value of "performance". This article looks at three models:
* Banister. The initial work on modeling human performance was made by Eric Banister in 1975<ref name="CalvertBanister1976"/> and verified by dozens of studies including one on runners<ref name="Morton-1990"/>.
* Busso. The work of Banister was refined by Thierry Busso to modify the Banister model to at least partly account for how [[Training Monotony]] impacts recovery<ref name="Busso-2003"/>.
* TSB. The [[Training Stress Balance ]] model is a simplification of the Banister model by Andrew Coggan which looks at just the relative changes in performance<ref name="TSB"/>.
The TSB model will be examined first, as it's the simplest to understand.
=The TSB Model=