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Fig. 5. Example rectified EMG vs time during hopping at 2.2 Hz on the 81, 27 and 11 kN m-1 surfaces for the (A–C) soleus (SOL), (D–F) vastus medialis (VM), (G–I) vastus lateralis (VL) and (J–L) rectus femoris (RF). All traces begin at touchdown and end at the following touchdown. First and second dashed lines indicate the times of peak force and takeoff, respectively. Hoppers had the least extensor muscle activity on a moderately stiff surface (27 kN m-1) and more activity on the softer and stiffer surfaces.





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