The Science of Peaking on Race Day
Every serious athlete faces the same paradox: training makes you fitter but also more tired. The art of periodization is managing this trade-off so that peak fitness and minimal fatigue coincide on competition day. The Banister fitness-fatigue model provides the mathematical framework for understanding this balance and designing optimal training plans.
Two Competing Processes
Each training session produces two effects: a fitness gain and a fatigue penalty. Both decay exponentially over time, but at very different rates. Fitness has a long time constant (about 42 days), meaning it builds and fades slowly. Fatigue has a short time constant (about 7 days), meaning it accumulates and dissipates quickly. Performance at any moment is the difference between accumulated fitness and accumulated fatigue.
The Taper: Where Science Meets Strategy
A taper is a planned reduction in training load before competition. By reducing load to 40-60% of normal, fatigue drops rapidly while fitness barely changes. The result is a supercompensation peak — a window of 1-3 weeks where the athlete performs 2-5% better than during full training. This small percentage is enormous in elite sport, where margins of victory are fractions of a percent.
Practical Periodization
Modern periodization extends the fitness-fatigue model into structured training blocks: base building (high volume, moderate intensity), specific preparation (race-pace work), and the taper. This simulation lets you experiment with different load patterns and time constants to find the combination that produces the highest performance peak at exactly the right moment.