Figure 2
From: Recruitment curve of the soleus H-reflex in chronic back pain and lumbosacral radiculopathy
Control H-reflex recruitment curves and relative mean values. A,B,C: Normalized bilateral H (empty symbols) and M (filled symbols) recruitment curves in three different healthy subjects. The amplitude of H- and M- responses, both expressed as a percentage of the maximal M-wave amplitude, are plotted as a function of the stimulus intensity, expressed as a multiple of the M-wave threshold. Squares and triangles represent left and right side, respectively. D: mean values of H-amplitude measured at motor threshold (left diagonal bar), and of H- (right diagonal bar) and M-amplitude measured at 1.5 × motor threshold (crossed bar) in the healthy subjects. All values are expressed as a percentage of the maximal M-wave size. Vertical bars indicate 1 S.D. E: mean values of H-threshold (empty bar) and interside threshold difference (filled bar) in the healthy subjects. All values are expressed as a multiple of the M-wave threshold. Vertical bars indicate 1 S.D.