Chronic Training Load represents your current degree of fitness, being an exponentially weighted average of your training load (i.e. TRIMP) over a period of 42 days by default.
Similar to ATL, Runalyze uses the alltime maximum CTL to express current CTL as percentage.
- Calvert, T. W., Banister, E. W., Savage, M. V., Bach, T.: A Systems Model of the Effects of Training on Physical Performance, IEEE Transactions on Systems, Man, and Cybernetics, volume SMC-6, issue 2, 1976, pp. 94–102, doi 10.1109/TSMC.1976.5409179
- Fellrnr.com - Modeling Human Performance
- The Training Stress Balance model by Andrew Coggan