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Fig. 1. Experimental apparatus. Subject performed swinging of one leg while
securely strapped to a rigid frame. Leg angle 
was measured using an
optical encoder. Subjects attempted to swing at a target amplitude, displayed
through visual feedback. The target amplitude was varied with frequency to
maintain a constant average rate of positive mechanical work on the leg. A
force plate measured ground reaction forces, which were used with to
calculate the leg torque about the hip. Electromyographic (EMG) activity of
the medial hamstring was also recorded to assess duration of muscle force
production. Oxygen consumption was measured to provide indirect calorimetry of
metabolic energy expenditure.
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