Concentric Contraction

Some articles on contraction, concentric contraction:

Methodology: Plyometrics That Utilize The Shock Method
... muscles undergo a powerful eccentric contraction ... muscles are forcibly tensed in an eccentric contraction ... to respond explosively, the eccentric contraction is then quickly switched to the isometric (when the downward movement stops) and then the concentric contraction, in a minimum amount of time ...
Muscle Contraction - Contractions - Concentric Contraction
... A concentric contraction or shortening contraction is a type of muscle contraction in which the muscles shorten while generating force ... This occurs when the force generated by the muscle exceeds the load opposing its contraction ... During a concentric contraction, a muscle is stimulated to contract according to the sliding filament mechanism ...