Rate of force development refers to what?

• A. The total amount of force produced
• B. How quickly force is produced
• C. The rate of speed of movement
• D. The time to peak velocity

Answer: (B)

Rate of force development is about how quickly you can generate force during the early part of a contraction. It’s essentially the slope of the force–time curve from the onset of force, often looked at in the first 0–200 milliseconds. The units are Newtons per second.

This focuses on speed of force production, not how much total force you can ultimately produce (that would be the peak force). It’s also different from movement speed or time to reach peak velocity, which are about how fast the movement itself occurs rather than how rapidly the muscles generate force.

Explosive strength relies on a high RFD, meaning you can unleash a large amount of force very quickly. This is why training that emphasizes rapid neural activation and quick recruitment of motor units, along with tissue stiffness, can improve RFD.