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.

Purpose: It helps runners and coaches determine optimal training paces and predict performance at different distances.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( CS \) — Critical speed (meters/second)
• \( D_{long} \) — Longer test distance (meters)
• \( D_{short} \) — Shorter test 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 changes over time.

4. Using the Calculator

Tips: Enter two different race/test distances and their corresponding times. The distances should be significantly different (e.g., 1500m and 5000m).

5. Frequently Asked Questions (FAQ)

Q1: What distances should I use for testing?
A: Common pairs are 1500m/5000m or 3000m/10000m, but any two significantly different distances work.

Q2: How accurate is critical speed for race prediction?
A: It's a good predictor for events lasting 30-60 minutes. Shorter races may be faster, longer races slower.

Q3: What's a good critical speed value?
A: Elite runners may have CS > 6 m/s, while recreational runners typically range 3-5 m/s.

Q4: How often should I test my critical speed?
A: Every 4-6 weeks to track training progress effectively.

Q5: Does this account for anaerobic capacity?
A: No, this only calculates aerobic capacity. The y-intercept of the distance-time relationship represents anaerobic capacity.