What is the purpose of the Stretch Reflex?

• A. To reduce force production
• B. Used to facilitate force potentiation
• C. To extend ground contact time
• D. To inhibit reflexive responses

Answer: (B)

The stretch reflex wires in to help you generate more force by priming the muscle for a stronger, quicker contraction after a rapid stretch. When a muscle is stretched quickly, muscle spindles detect that change and send signals that cause an additional contraction, whooshing in alongside your voluntary effort. This reflexive activation contributes to force potentiation—the boost in force output you often see when a pre-stretch precedes the main movement, as in a jump or sprint where the stretch-shortening cycle is at work. So the purpose is to facilitate this increased force production. The other options describe outcomes that aren’t what the stretch reflex aims to do.