Which statement describes isokinetic exercise?

Which statement describes isokinetic exercise?

• A. Muscle shortening and active movement
• B. Muscle contraction without shortening
• C. Muscle contraction with resistance
• D. Endurance training only

Answer: (C)

Isokinetic exercise involves moving a joint at a constant speed while the muscle works against resistance. The key feature is maintaining the same movement velocity throughout the entire range of motion, with the resistance adjusting to allow the muscle to generate maximal force at each point of the movement. The statement describing muscle contraction with resistance aligns with this idea, since isokinetic work requires dynamic contraction against opposing force. Contrast: moving with shortening and active movement describes a typical concentric (isotonic) action without guaranteeing constant speed; contraction without shortening is isometric and has no joint movement; endurance training can involve various types of contractions and is not specific to the isokinetic mechanism.

Isokinetic exercise involves moving a joint at a constant speed while the muscle works against resistance. The key feature is maintaining the same movement velocity throughout the entire range of motion, with the resistance adjusting to allow the muscle to generate maximal force at each point of the movement. The statement describing muscle contraction with resistance aligns with this idea, since isokinetic work requires dynamic contraction against opposing force.

Contrast: moving with shortening and active movement describes a typical concentric (isotonic) action without guaranteeing constant speed; contraction without shortening is isometric and has no joint movement; endurance training can involve various types of contractions and is not specific to the isokinetic mechanism.