Which statement correctly describes isokinetic exercise?

Which statement correctly describes isokinetic exercise?

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

Answer: (D)

Isokinetic exercise involves muscle contractions with resistance applied in a way that keeps the joint moving at a constant speed through the full range of motion. This constant velocity is usually achieved with specialized equipment that provides accommodating resistance, so effort can be maximal while the speed stays the same. The muscle can shorten (concentric) or lengthen (eccentric) during the movement, but the key feature is maintaining that steady pace. The description “muscle contraction with resistance” captures this idea, distinguishing it from isometric contractions (no movement) and from general endurance training that isn’t defined by a constant speed with accommodated resistance.

Isokinetic exercise involves muscle contractions with resistance applied in a way that keeps the joint moving at a constant speed through the full range of motion. This constant velocity is usually achieved with specialized equipment that provides accommodating resistance, so effort can be maximal while the speed stays the same. The muscle can shorten (concentric) or lengthen (eccentric) during the movement, but the key feature is maintaining that steady pace. The description “muscle contraction with resistance” captures this idea, distinguishing it from isometric contractions (no movement) and from general endurance training that isn’t defined by a constant speed with accommodated resistance.