What term describes the state when a muscle is stretched more than 1.5 times its normal length?

The correct term for a muscle being stretched more than 1.5 times its normal length is passive insufficiency. This concept refers to the inability of a muscle to effectively stretch or elongate when the opposing muscle or muscle group is already lengthened. In this state, the passive tension in the muscle can prevent it from reaching its full functional range, leading to a situation where the muscle cannot contribute effectively to movement or stabilization.

In contrast, active insufficiency refers to a muscle's inability to generate optimal force when it is too short or too long due to active contraction. The stretch reflex refers to the automatic response of a muscle to being stretched, often resulting in a contraction to prevent injury. Muscle hypertrophy describes the increase in muscle size due to strength training and is not directly related to muscle lengthening or stretching. Understanding passive insufficiency is crucial for fitness professionals when developing stretches or exercises to ensure proper range of motion and effectiveness of muscle function.