Physical Therapy Assistant Practice Exam

During rehabilitation, what is the goal of isometric contraction?

1. Shortening the muscle while under tension

2. Lengthening the muscle while controlling movement

3. Maintaining muscle tension without changing length

4. Maximizing flexibility and range of motion

The correct answer is: Maintaining muscle tension without changing length

The goal of isometric contraction during rehabilitation is to maintain muscle tension without any change in muscle length. This type of contraction occurs when a muscle is activated and generates force, but does not shorten or lengthen, allowing for strength to be developed in a specific angle of joint position. Isometric contractions are especially useful in rehabilitation settings because they can help preserve muscle strength when joint movement is restricted due to injury or post-surgery recovery. This method of exercise also minimizes joint stress and is often safe for patients who may have limited mobility or who need to avoid full range of motion. By focusing on maintaining muscle tension, healthcare providers can facilitate muscle activation and neuromuscular control without exacerbating existing injuries or pain.