Critical Power (CP) modeling
Critical Power (CP) modeling offers a comprehensive view of cycling performance, focusing on three key metrics:
Critical Power (CP): The maximum power an athlete can sustain without rapid fatigue, marking the threshold between steady and non-steady exercise.
Available Work Capacity (W’): Represents the finite amount of work (in Joules) an athlete can perform above CP. Once W’ is exhausted, sustaining power above CP becomes unfeasible.
Max Power: The peak power achieved over a 5-second sprint, reflecting short-term anaerobic capacity.
Why Vekta Uses CP Over FTP
While FTP estimates a cyclist’s sustainable power over an hour, Vekta prioritizes CP for its accuracy across multiple durations. CP is derived from a scientifically grounded model, providing:
Mathematical Rigor: Using a range of max efforts, CP better represents both aerobic and anaerobic capacities.
Enhanced Robustness: CP reflects sustained and high-intensity efforts, adapting more effectively to real-world performance variations than a single FTP estimate.
How Vekta Computes CP, W’, and Max Power
Vekta’s model continuously adapts by analyzing recent max efforts. This dynamic approach reflects ongoing performance shifts, with algorithms that:
Incorporate Varied Durations: Vekta’s adaptable algorithms use different max-effort intervals to create an accurate power profile.
Track Performance Trends: Regular updates based on recent data capture changes in fitness and endurance, helping predict future performance.
Classic CP Test Protocol
A common CP testing protocol includes:
15-second Max Power: Measures peak anaerobic output.
3-minute Max Effort: Captures short-term power.
12-minute Max Effort: Contributes to CP calculation for sustained power.
With CP modeling, Vekta offers a scientifically robust performance framework, allowing cyclists to track improvements, optimize training, and achieve a more complete understanding of their endurance and power potential.
Further Reading
Morton, H.R. (1996): A 3-parameter critical power model. Ergonomics, 39(4), 611–619.
Leo P et al. (2022): Power profiling and the power-duration relationship in cycling. Eur J Appl Physiol.
McGrath, E., Mahony, N., Fleming, N., Raleigh, C., & Donne, B.: Do Critical and Functional Threshold Powers Equate in Highly-Trained Athletes? Human Performance Laboratory, Departments of Anatomy and Physiology, School of Medicine, Trinity College Dublin.