The greatest power output of a muscle fiber occurs at approximately what percentages ofits maximum potential force and velocity outputs?

The greatest power output of a muscle fiber occurs at approximately 30-50% of its maximum potential force and at approximately 30-60% of its maximum velocity output.

Here's a step-by-step explanation:

1. Muscle power is the product of force (how strong the muscle contraction is) and velocity (how fast the muscle contracts).

2. The relationship between force, velocity, and power is not linear. This means that maximum power does not occur at maximum force or maximum velocity.

3. Instead, maximum power output occurs at a balance between force and velocity. This is because as force increases, velocity decreases and vice versa.

4. Research has shown that the greatest power output occurs when a muscle is contracting at about 30-50% of its maximum force and 30-60% of its maximum velocity.

5. This is known as the force-velocity curve, which is a key principle in exercise physiology.

6. Understanding this principle can help in designing effective training programs to maximize muscle power.