Movement Analysis Practice Test

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Which GRF component is represented by the X-axis?

Vertical

Sagittal

Anterior-posterior

Medial-lateral

The X-axis is defined as the side-to-side direction, so the component of the ground reaction force along this axis captures medial-lateral loading. In gait analysis, the vertical component measures up-down forces, and the anterior-posterior component captures forward-backward forces. The term sagittal refers to a plane (left-right division) rather than a specific axis, so it isn’t a GRF component along an axis. Hence, the X-axis corresponds to the medial-lateral GRF.

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