Rectus femoris length project

This study aimed to investigate how altering the length of one muscle influences motor unit discharge behavior of its synergists. Eighteen healthy participants performed submaximal isometric knee extensions with the hip joint positioned at 90° (shortened rectus femoris, RF) and 180° (lengthened RF). HDsEMGs were recorded from the synergistic vastus medialis and vastus lateralis. Motor unit spike trains were decomposed from HDsEMG, tracked across hip positions, and analyzed for mean discharge rate and coefficient of variation of interspike interval.
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