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Fig. 3. Principle component weightings from the intensity spectra from the ramped
isometric contractions. The components were calculated from 2160 intensity
spectra from the rectus femoris, vastus lateralis, vastus medialis, lateral
gastrocnemius, medial gastrocnemius and soleus muscles from 10 subjects and
over a force range from 5 to 95% max. voluntary contraction (MVC). The first
four principle components (PC) are shown, with the relative proportion of the
total signal that they describe.