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Fig. 7. Contraction force (% max. voluntary contraction; MVC) at which the initial intensity peak occurred during each graded contraction as a function of the center frequency for each wavelet domain. Rectus femoris, open triangles; vastus lateralis, solid diamonds; vastus medialis, open diamonds; lateral gastrocnemius, solid circles; medial gastrocnemius, open circles; soleus, open squares. Values are the mean ± S.E.M. (30≤N≤50 for fc<250 Hz and 6≤N≤50 for 250≤fc≤400 Hz). The third order polynomial regression lines (Table 3; P<0.001) were calculated from the mean points for each muscle and for 1≤k≤13 (19≤fc≤542 Hz).





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