What is concentric action in terms of muscle movement?

Concentric action refers specifically to the type of muscle contraction where the muscle generates tension while shortening. During this process, the muscle fibers contract, pulling on the bone to which they are attached, resulting in movement. This is typically seen in actions such as lifting weights or performing a bicep curl, where the elbow flexors shorten as the arm lifts.

Understanding concentric action is essential for grasping how movement occurs during physical activity. Concentric contractions are also important in terms of strength training, as they play a critical role in building force and size in the muscle. This action contrasts with other forms of muscle contraction, such as eccentric, where the muscle lengthens while under tension, and isometric, where the muscle remains the same length while contracting.