Which statement best describes isometric contractions?

• A. It helps muscles elongate during movement
• B. It increases oxygen consumption rapidly
• C. It is used to maintain posture without changing length
• D. It causes muscles to shorten quickly

Answer: (C)

Isometric contractions involve tensing a muscle without changing its length. This makes them ideal for holding a position or stabilizing joints, such as maintaining posture, because the muscle generates force without shortening or lengthening. The other statements describe actions that involve muscle shortening (concentric) or lengthening (eccentric) or general energy use, which aren’t defining features of isometric work.