IFPA Trainer Practice Exam

Contractions using a specialized machine that maintains the same speed throughout an exercise are classified as ______.

1. Isotonic

2. Isometric

3. Dynamic constant resistance

4. Isokinetic

The correct answer is: Isokinetic

The classification of contractions using a specialized machine that maintains the same speed throughout an exercise is identified as isokinetic contractions. In isokinetic training, the resistance offered by the machine adjusts throughout the range of motion to keep the speed constant regardless of the force exerted by the individual. This means that no matter how hard the person pushes or pulls, the machine ensures the velocity remains stable, allowing for maximal muscle engagement at all points of the exercise. In contrast, isotonic contractions involve a constant load or resistance throughout the movement, which does not account for changes in the speed of the contraction. Isometric contractions, on the other hand, involve muscle tension without any change in muscle length, meaning there is no movement at the joint. Dynamic constant resistance refers to traditional weight training where the load remains constant throughout the movement but does not guarantee a fixed speed. Therefore, the unique characteristic of maintaining a specific speed during the contraction is what distinctly identifies isokinetic training.