As for residual force enhancement, several experiments have found that single muscle fibers subjected to maximal (tetanized) contractions produce lower tension after a being shortened to a standard length, compared to
a comparable isometric contraction at the same standard length, without the preceding shortening phase.
They report that the pronated grip pull up produced
comparable (120 % vs. 117 % of maximum voluntary
isometric contraction (MVIC) levels) latissimus dorsi muscle activity compared with the supinated chin - up exercise.