1.1.2 stretch shortening cycle A level pe
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Dynamic contraction
Muscle changing length under contraction
The 3 stages of the stretch shortening cycle
1. Eccentric contraction: Muscle lengthens and elastic energy is stored 2. Amortization: Motor neurons fire from the spinal cord to muscles 3. Concentric contraction: Muscles contract and elastic energy is released
static contraction
The length of the muscle does not change but the tension does in the process
eccentric contraction
This involves a muscle lengthening under tension. When a muscle contracts eccentrically it is acting as a brake. E.g the downward phase of a squat, the quadriceps is lengthening
cocentric contraction
This involves the muscle shortening under tension e.g the upward phase of a squat
