Fig. 3.

Average experimentally measured and processed EMG for 11 muscles for subjects walking at four speeds and running at four speeds (N=5). We collected surface EMG for 11 lower limb muscles: gastrocnemius lateralis, gastrocnemius medialis, soleus, tibialis anterior, biceps femoris long head (LH), semitendinosus, rectus femoris, gluteus maximus, gluteus medius, vastus lateralis and vastus medialis. The raw signal was high-pass filtered at 30 Hz, rectified, and low-pass filtered at 10 Hz. Each subject's filtered EMG measurements were normalized to the maximum value detected for each muscle across all speeds.