Motor units and muscle size [ edit ] More strength can be generated when more motor units are activated. FT (rapid contraction) motor units generate more force than ST motor units (slow contraction) since each Ft motor unit has more muscle fibers than an ST. Similarly, larger muscles by having more muscle fibers can produce more strength than smaller muscles. Speed of action [ edit ] The ability to develop strength also depends on the speed of muscular action. During concentric actions, the development of maximum force decreases progressively at higher speeds.
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