What happens during a concentric contraction?

During a concentric contraction, the muscle fibers shorten as they generate force, which results in movement that pulls the bones closer together. This type of contraction typically occurs when you lift a weight or push against resistance. For example, during a bicep curl, as the weight is lifted towards the shoulder, the bicep muscle engages in a concentric contraction, shortening its length to produce the upward movement.

This action contrasts with other types of muscle contractions: eccentric contractions involve lengthening of the muscle while still under tension, isometric contractions maintain constant muscle length without movement, and relaxation involves a decrease in muscle tension allowing for the joints to open. Understanding these different types of contractions is essential for developing effective training programs and for educating clients on proper movement mechanics.