Abstract
Generating high power from a muscle undergoing a cyclical lengthening and shortening contraction pattern requires fast and efficient muscle activation and relaxation. To enhance activation and increase force levels during shortening, some muscle types have evolved stretch activation (SA), a delayed increased in force following rapid muscle lengthening. SA’s complementary phenomenon is shortening deactivation (SD), a delayed decrease in force following muscle shortening, which increases muscle relaxation and results in less resistive force during subsequent muscle lengthening.
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