Concentric Action


Common Misnomers and Mix-ups: Muscle Actions, Balance, Stability, Single Legs and Straight Back

All muscle contractions involve the muscle shortening or attempting to shorten against resistance. There are not different types of contractions only different types of actions (movement or lack thereof) depending on the circumstances. A muscle is producing force by contraction but this may lead to shortening (concentric action), lengthening (eccentric action), or maintaining length (isometric action). So the concept of muscle actions specifically describe the type of length changes that skeletal muscle may undergo after it has been activated by the nervous system.

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