1. What is Critical Speed in Running?

Definition: Critical Speed (CS) is the theoretical running speed that can be maintained for a long duration without exhaustion, calculated using performance at two different distances.

Purpose: It helps athletes and coaches determine optimal training paces and predict performance at various distances.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( CS \) — Critical Speed (meters/second)
• \( D_{long} \) — Longer distance (meters)
• \( D_{short} \) — Shorter distance (meters)
• \( T_{long} \) — Time for longer distance (seconds)
• \( T_{short} \) — Time for shorter distance (seconds)

Explanation: The formula calculates the slope of the distance-time relationship, representing the speed that can be maintained aerobically.

3. Importance of Critical Speed

Details: Critical Speed helps determine training zones, predict race performance, and monitor fitness improvements over time.

4. Using the Calculator

Tips: Enter two race distances and corresponding times. The distances should be significantly different (e.g., 1500m and 5000m). Times must be in seconds.

5. Frequently Asked Questions (FAQ)

Q1: What distances should I use?
A: Use two races with significantly different distances (e.g., 1500m and 5000m, or 5K and 10K).

Q2: How accurate is critical speed?
A: It's a theoretical estimate - actual performance depends on factors like terrain, weather, and race strategy.

Q3: What's a good critical speed value?
A: This varies by athlete level. Elite runners might have CS > 6 m/s, while recreational runners might be 3-5 m/s.

Q4: Can I use training runs instead of races?
A: Race times give the most accurate CS, but hard training efforts can provide estimates.

Q5: How does critical speed relate to lactate threshold?
A: Critical speed typically occurs at or slightly above lactate threshold pace.