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Direction of foot force for pushes against a fixed pedal: role of effort level
Kreg G Gruben1, Lynn M Rogers, Matthew W Schmidt
1Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, WI 53706-1189, USA.
Abstract:
Control of the force exerted by the foot on the ground is critical to human locomotion. During running on a treadmill and pushing against a fixed pedal, humans increased foot force in a linear manner in sagittal plane force space. However, for pushes against a moving pedal, force output was linear for some participants but slightly curved for others. A primary difference between the static and dynamic pedaling studies was that the dynamic study required participants to push with varying peak effort levels, whereas a constant peak effort level was used for the fixed pedal pushes. The present study evaluated the possibility that force direction varied with level of effort. Seated humans pushed against a fixed pedal to a series of force magnitude targets. The force direction varied systematically with effort level consistent with the force path curvature observed for dynamic pedaling.
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