What is the definition of an isokinetic contraction?

An isokinetic contraction is defined as a contraction where the muscle exerts maximum force at a constant speed throughout the entire range of motion. This means that the resistance provided by an apparatus adjusts continuously to accommodate the user's strength throughout the movement, ensuring that the muscle is working as hard as possible regardless of its position in the range of motion.

This type of contraction is particularly useful in rehabilitation and strength training because it allows for controlled and measurable exertion, which can help prevent injury while promoting muscle strength and endurance. The key aspect is the combination of maximal force generation maintained at a constant velocity, distinguishing isokinetic contractions from other forms of muscle contractions that may involve varying speeds, fixed forces, or simply produce no movement at all.