1. What is the JB Morin Force Velocity Profile?

Definition: This calculator implements the linear force-velocity relationship model proposed by JB Morin, which describes how force production decreases as movement velocity increases.

Purpose: It helps athletes, coaches, and sports scientists understand and predict force production capabilities at different movement velocities.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( F \) — Resulting force (Newtons)
• \( F_0 \) — Maximum isometric force (Newtons)
• \( v_{max} \) — Maximum unloaded velocity (m/s)
• \( v \) — Current movement velocity (m/s)

Explanation: The model shows a linear decrease in force production as velocity increases from zero (isometric) to maximum velocity (zero force).

3. Importance of Force-Velocity Profile

Details: Understanding an athlete's force-velocity profile helps optimize training programs by identifying strengths and weaknesses in different velocity ranges.

4. Using the Calculator

Tips: Enter the maximum isometric force (F₀), maximum unloaded velocity (v_max), and current velocity (v). All values must be ≥ 0, with F₀ and v_max > 0.

5. Frequently Asked Questions (FAQ)

Q1: What are typical F₀ values for athletes?
A: Varies by sport and athlete level. Elite sprinters might have F₀ values of 2000-3000N in horizontal movements.

Q2: How is v_max measured?
A: Typically measured during unloaded sprinting or using specialized equipment like force plates and motion capture.

Q3: Does this model apply to all movements?
A: It works best for horizontal movements like sprinting. Vertical movements may follow different profiles.

Q4: What if my velocity exceeds v_max?
A: The model predicts negative forces at v > v_max, which isn't physiologically meaningful. Keep v ≤ v_max.

Q5: How can I improve my force-velocity profile?
A: Targeted training including heavy resistance training (improves F₀) and high-velocity movements (improves v_max).