Which GRF component is represented by the Y-axis?

Which GRF component is represented by the Y-axis?

• A. Vertical
• B. Medial-lateral
• C. Anterior-posterior
• D. Transverse

Answer: (C)

In ground-reaction force analysis, three perpendicular axes represent the forces: vertical, anterior-posterior, and medial-lateral. In this convention, the forward–backward direction is assigned to the Y-axis. So the force component you’re looking at along the Y-axis corresponds to the anterior-posterior component of the GRF, capturing propulsion or braking as you move. The vertical component lies along the vertical axis (up–down) and the medial-lateral component lies along the side-to-side axis. The transverse plane represents rotation, not a primary GRF direction in this framework. Remember that axis labeling can vary by lab, so always align with the coordinate system being used.

In ground-reaction force analysis, three perpendicular axes represent the forces: vertical, anterior-posterior, and medial-lateral. In this convention, the forward–backward direction is assigned to the Y-axis. So the force component you’re looking at along the Y-axis corresponds to the anterior-posterior component of the GRF, capturing propulsion or braking as you move.

The vertical component lies along the vertical axis (up–down) and the medial-lateral component lies along the side-to-side axis. The transverse plane represents rotation, not a primary GRF direction in this framework. Remember that axis labeling can vary by lab, so always align with the coordinate system being used.