GLOSSARY

The stretch–shortening cycle (SSC) is a movement pattern in which a rapid eccentric contraction (stretch of muscle and tendon) is immediately followed by a concentric contraction, making the concentric force greater than without the preceding stretch.

Three Phases

• Eccentric (loading) phase: muscle–tendon stretch, as when the heel lands in running.
• Amortisation (transition) phase: the time between the end of stretch and the start of shortening; it should be very short.
• Concentric (unloading) phase: shortening and push-off.

Mechanisms