Figure 6
From: Specificity of surface EMG recordings for gastrocnemius during upright standing
Relative, surface representation of soleus motor units. The distribution of the amplitude of surface EMGs, triggered and averaged with the firing instants of soleus motor units, is shown for each participant and for each inter-electrode distance. These amplitude values were normalised by the amplitude of surface EMGs triggered with the firing instants of gastrocnemius motor units, averaged across all firings of all gastrocnemius motor units identified for each subject and separately for each inter-electrode distance. The horizontal, shaded rectangles indicate the shortest inter-electrode distances considered to compute the crosstalk threshold (dashed, horizontal lines; cf. Statistics). The crossed circle corresponds to the intersection between the crosstalk threshold and the third order polynomial fitting the 10 median values nearest to the crosstalk threshold. Different scales have been used to take into account the different distribution range across subject, which was likely due to the small sample of units detected during the standing task.
