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Simulating Ideal Assistive Devices to Reduce the Metabolic Cost of Running

Fig 7

Activations of three representative muscles crossing the hip when running at 5 m/s with various hip assistive devices.

Mean activations are shown for the gluteus maximus (left), rectus femoris (center), and psoas (right) on the right leg when running without assistance (black) and with four combinations of three hip actuators: flexion/extension only (red), flexion/extension with abduction/adduction (green), flexion/extension with internal/external rotation (blue), and all three actuators (orange). These results suggest that the gluteus maximus is particularly effective at generating a hip abduction moment because its activation decreased dramatically when the abduction/adduction actuator was added (e.g., compare the blue and orange curves). The rectus femoris does not appear to be especially favorable for generating a hip rotation moment because its activation was similar regardless of whether the internal/external rotation actuator was present (i.e., the red and blue curves are approximately equal, as are the green and orange curves).

Fig 7