1. What is W' (Watt Prime)?

W' (Watt Prime) represents the finite amount of work that can be performed above critical power (CP) during high-intensity cycling. It's a key metric in endurance sports physiology that quantifies an athlete's anaerobic work capacity.

2. How Does the Calculator Work?

The calculator uses the W' equation:

Where:

• \( W' \) — Watt Prime (joules)
• \( \text{Total Work} \) — Total work performed (joules)
• \( CP \) — Critical Power (watts)
• \( t \) — Time duration (seconds)

Explanation: The equation calculates the additional work performed beyond what could be sustained at critical power for the given duration.

3. Importance of W' Calculation

Details: W' helps athletes and coaches understand anaerobic capacity, pacing strategies, and fatigue development during high-intensity efforts. It's particularly important for interval training and race strategy.

4. Using the Calculator

Tips: Enter total work in joules, critical power in watts, and time in seconds. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical W' value for cyclists?
A: Recreational cyclists might have W' values around 10-15 kJ, while elite cyclists often have 20-30 kJ. Values vary based on training status and physiology.

Q2: How is W' different from FTP?
A: W' measures anaerobic capacity (work above CP), while FTP (Functional Threshold Power) represents sustainable power. They're complementary metrics.

Q3: Can W' be improved with training?
A: Yes, though it's generally more trainable than CP. High-intensity interval training can increase W'.

Q4: How do I measure total work?
A: Most power meters and cycling computers calculate total work automatically during a ride or interval.

Q5: What affects W' recovery?
A: W' recovery depends on intensity below CP, duration, and individual factors. Complete recovery may take minutes to hours.