What are the contractile contributions of the SSC?

• A. Force potentiation, increased activation w/ CM, Stretch reflex
• B. Decreased neural activation
• C. Shortened muscle-tendon length
• D. Reduced force development

Answer: (A)

In the stretch-shortening cycle, the pre-stretch primes the muscle for a more powerful shortening phase through neural and contractile mechanisms. The contractile contributions come from force potentiation, where the prior stretch enhances the force the muscle can produce in the next contraction; increased neural activation with a countermovement, which raises the level of muscle drive just before shortening; and the stretch reflex, where the rapid stretch activates muscle spindles to boost motor output during the shortening phase. Together, these factors explain why the SSC can produce greater force than a purely concentric action. The other options describe states that would reduce or fail to enhance force, so they don’t fit.