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High density EMG investigation of h-reflex distribution over the soleus muscle

The spatial distribution of H-reflexes over soleus muscle was investigated through High-Density EMG in five healthy subjects. The posterior tibial nerve was stimulated with a staircase current envelope with 1mA steps. The regions where the incremental responses (incremental H-reflexes) occurred were identified for each stimulation step with a validated segmentation algorithm. The average centroid of the segmented areas was located over the Achilles tendon, 5 cm below the myo-tendinous junction of the medial gastrocnemius. The average dimension of these regions corresponded to 28% of the surface covered by the grid of electrodes. The amplitude of H-reflexes recorded in the segmented areas was higher than the average amplitude computed over the entire detection system as well as the H-reflex recorded by the electrode positioned according to SENIAM guidelines. These preliminary results suggest that: i) H-reflex detected from a specific soleus region unlikely reflects the whole muscle volume and ii) H-reflexes with greatest amplitude can be recorded over the Achilles tendon.