Bouncing when stretching is no longer recommended because of what reflex?

Question

Quizplus · Accepted Answer

Bouncing when stretching is not recommended because it can activate the muscle spindle, a sensory receptor within the muscle that senses changes in muscle length. When the muscle is rapidly stretched, as in bouncing movements, the muscle spindle triggers a reflex contraction of the muscle to prevent overstretching and injury, which is counterproductive to the goal of stretching.

Bouncing When Stretching Is No Longer Recommended Because of What