Which type of contraction allows movement in the muscle?

Isotonic contraction is the type of muscle contraction that allows movement within the muscle. During isotonic contractions, the muscle changes length while producing tension, which results in movement of a body part. This type of contraction can be further divided into two categories: concentric and eccentric.

In concentric contractions, the muscle shortens as it contracts, for example, during a bicep curl when lifting the weight. Eccentric contractions involve the muscle lengthening while still generating force, such as when lowering the weight back to the starting position in a controlled manner. Both of these actions contribute to the movement of the body.

In contrast, isometric contractions involve the muscle generating tension without changing length, which does not produce movement. Static contraction also implies a lack of movement, where the muscle remains contracted without any alteration in length. While these types of contractions have their significance in stability and strength-building exercises, they do not facilitate movement itself.