Frontal Plane Biomechanics during Walking-Current Trends in Biomedical Engineering & Biosciences-Juniper Publishers

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Frontal Plane Biomechanics during Walking

Authored by Anne Schmitz,

The goal of this study was to test the assumption that the ground reaction force (GRF) passes through the whole body's center of mass (COM) in the frontal plane during walking. Whole body kinematics were analyzed for 17 subjects (7 male, 10 female, age 24±4 years old, height 1.71±0.07 m, mass 66.1±12.4 kg) walking at a self-selected speed (1.17±0.10 m/s) on an instrumented treadmill. The time rate of change of the angular momentum of the body in the frontal plane with respect to the lab coordinate system was calculated, along with the magnitude of the GRF in the frontal plane, and the moment arm of the GRF about the body's COM. The moment arm of the GRF about the COM in the frontal plane ranged from -33 to 27 mm during gait. This is contrary to what has been assumed previously in the literature where the GRF has been presumed to pass through the body's COM when describing the influence of trunk motion on lower limb joint loading. Our results suggest the relation between trunk motion and knee joint loading may require an alternative explanation than is currently presented in the literature.

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