Eccentric contraction

Definition

Eccentric contraction occurs when a muscle lengthens under tension, often to control the speed of movement or resist gravity. It is an integral part of movements such as lowering a weight or descending stairs, where the muscle actively elongates.

Related terms

Concentric Contraction: A type of muscle action that occurs when a muscle shortens in length and generates force, like lifting a weight upwards.

Isometric Contraction: This happens when a muscle exerts force without changing its length, similar to holding a weight steady without moving it up or down.

Motor Unit: A single motor neuron and all the muscle fibers it innervates, crucial for controlling the strength and precision of muscle contractions