Training Load

Mathematical and physiological reference for the two exponentially-weighted moving averages of daily training stress that approximate the fitness and fatigue components of the Banister impulse-response model: Chronic Load (slow, ~42-day time constant) and Acute Load (fast, ~7-day time constant).

Mathematical and physiological reference for Load Balance, the daily scalar difference between chronic training load and acute training load, computed as exponentially weighted moving averages of daily training stress, used as a heuristic indicator of training-induced freshness or fatigue.

Mathematical and physiological reference for Training Impulse, the heart-rate-based daily training-load metric introduced by Banister, computed as duration multiplied by a sex-specific exponentially-weighted heart-rate-reserve fraction. The historical and practical heart-rate alternative to power-based load scoring for activities without a power meter.