Concentric contraction is defined as which of the following?

Concentric contraction is defined as which of the following?

• A. A Shortening of the muscle
• B. B Lengthening of the muscle
• C. C No change in muscle length
• D. D Force applied with movement

Answer: (A)

Concentric contraction means the muscle shortens while it’s contracting, producing movement. As the muscle fibers generate force, they shorten, pulling on the bones to bring a joint closer together—think of the upward phase of a bicep curl when the arm bends and the muscle shortens. That shortening is what defines concentric work. To place it in context, the opposite is eccentric contraction, where the muscle lengthens under tension (like lowering the weight in a curl). There’s also isometric contraction, where the muscle produces force but its length doesn’t change (holding a weight steady). “Force applied with movement” is too vague because movement can occur with concentric or eccentric actions, not a defining feature by itself.

Concentric contraction means the muscle shortens while it’s contracting, producing movement. As the muscle fibers generate force, they shorten, pulling on the bones to bring a joint closer together—think of the upward phase of a bicep curl when the arm bends and the muscle shortens. That shortening is what defines concentric work.

To place it in context, the opposite is eccentric contraction, where the muscle lengthens under tension (like lowering the weight in a curl). There’s also isometric contraction, where the muscle produces force but its length doesn’t change (holding a weight steady). “Force applied with movement” is too vague because movement can occur with concentric or eccentric actions, not a defining feature by itself.