How to Easily Make Sense of Your Training Load Data Using TSB

How to Easily Make Sense of Your Training Load Data Using TSB

Training Stress Balance (TSB) is a concept I first heard of in Training and Racing with Power Meter by Allen and Coggan in 2010 and I immediately found it very interesting and tried implementing a couple of times.

TSB revolves, similar to Banister model, around Chronic (CTL) and Acute training load (ATL). The chronic load is usually the rolling average of the last 4-6 weeks (this is called the time constant) and represents “baseline” and current level of fitness. Acute training load is usually a rolling average of the last 5-14 days (usually 7) and represents “freshness” (or the opposite, “overload”).

Training Stress Balance is then TSB = CTL – ATL, and represents their “interaction”, basically hinting about how much is the recent loads higher/lower compared to more chronic loads. If one increases ATL too quickly and too much over the CTL, one will probably suffer from fatigue-related problems (and possibly injuries). If ATL is below CTL, one will probably feel much fresher (as in tapering), but will soon start de-training.

The goal of training is hence to slowly raise (or keep relatively constant) CTL (or as I would like to say “raising the floor” while others might call it “slow cooking the athlete”) with occasional high/fast increases in ATL either to peak or to provide overload.

I have been playing with TSB and tried to actually predict the performance, but I haven’t got any better results than Banister model. The TSB model is very simple:

Test Result = CTL * k1 – ATL * k2 + test_result0

One needs to optimize five parameters to find the smallest sum of squares:

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I am a physical preparation coach from Belgrade, Serbia, grew up in Pula, Croatia (which I consider my home town). I was involved in physical preparation of professional, amateur and recreational athletes of various ages in sports such as basketball, soccer, volleyball, martial arts and tennis. Read More »
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Welcome to Complementary Training Community! Forums How to easily make sense of your training load data using TSB

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