... experimental activations at three ankle angles (−20, 0 and 20 deg) with the knee flexed to approximately 20 deg: MG stimulation (STIM MG ), SOL stimulation (STIM SOL ), combined stimulation, and volitional contraction. At 20 deg plantarflexion, STIM SOL elicited 49% larger tendon non-uniformity (SOL–MG...

...Anthony G. Schache; Adrian K. M. Lai; Nicholas A. T. Brown; Kay M. Crossley; Marcus G. Pandy ABSTRACT We explored how humans adjust the stance phase mechanical function of their major lower-limb joints (hip, knee, ankle) during maximum acceleration sprinting. Experimental data [motion capture...

...% (1.50 m s –1 ) and 140% (1.75 m s –1 ) of their preferred step length (L * ) at 1.25 m s –1 . In each condition subjects donned robotic ankle exoskeletons on both legs. The exoskeletons were powered by artificial pneumatic muscles and controlled using soleus electromyography (i.e. proportional...

...Gregory S. Sawicki; Daniel P. Ferris SUMMARY We examined healthy human subjects wearing robotic ankle exoskeletons to study the metabolic cost of ankle muscle–tendon work during uphill walking. The exoskeletons were powered by artificial pneumatic muscles and controlled by the user's soleus...

...Gregory S. Sawicki; Daniel P. Ferris SUMMARY Robotic lower limb exoskeletons that can alter joint mechanical power output are novel tools for studying the relationship between the mechanics and energetics of human locomotion. We built pneumatically powered ankle exoskeletons controlled...