THE STRETCH-SHORTENING CYCLE IS A PERFORMANCE MECHANISM.
- 01
A rapid eccentric action followed by a short transition can increase force, work or power in the following concentric action.
- 02
Elastic energy stored in tendon and other tissues, residual force enhancement and neural reflex contributions can all play roles.
- 03
The size of the benefit depends on transition time, movement skill, stiffness and the task.
- 04
A stronger stretch-shortening cycle does not prove greater hypertrophy; it mainly explains acute performance in jumping, sprinting and ballistic actions.
STRETCH — TRANSITION — SHORTEN.
The stretch-shortening cycle occurs when an active muscle-tendon unit is rapidly lengthened and then immediately shortens. A countermovement jump is a classic example: the downward phase precedes the upward propulsion phase.
IT IS MORE THAN A SIMPLE REFLEX.
Systematic review evidence supports force-enhancing mechanisms across muscle and muscle-tendon levels. Stored elastic energy, residual force enhancement and neural contributions can all influence the improved shortening performance.
ENERGY IS LOST WHEN THE PAUSE IS TOO LONG.
The performance advantage is generally largest when the transition between eccentric and concentric actions is short. A long pause dissipates stored elastic energy and changes neural preparation, which is why pause squats and countermovement jumps are mechanically different tasks.
STATIC STRETCHING IS A DIFFERENT QUESTION.
Long static stretching immediately before explosive performance can reduce output in some settings, while dynamic preparation is generally more compatible with stretch-shortening tasks. Chronic stretching does not replace plyometric or resistance training for power.
TRAIN THE CYCLE WITH THE TASK.
Plyometrics, jumps, throws and ballistic lifts train rapid eccentric-to-concentric transitions. Heavy strength work raises force capacity, but fast task practice is needed to express that force efficiently in short time windows.
DON’T TURN A BOUNCE INTO A HYPERTROPHY CLAIM.
Common mistakes include calling every eccentric-concentric repetition a meaningful SSC, assuming the stretch reflex is the only mechanism and using acute elastic energy to claim that bouncing reps build more muscle.
READ THE EVIDENCE.
- 01Systematic review (2019).
Contraction modalities and force enhancement in the stretch-shortening cycle.
PUBMED ↗ - 02Systematic review (2013).
Stretching and performances involving stretch-shortening cycles.
PUBMED ↗ - 03Systematic review/meta-analysis (2024).
Chronic static stretching and jumping/sprinting performance.
PUBMED ↗ - 04Systematic review (2017).
Influence of chronic stretching on muscle performance.
PUBMED ↗
Educational content only. It is not medical advice. See the Fitness Disclaimer.