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Figure 4


Fig. 4. Orientation and body angles used in the present study. The heading angle ({psi}) was defined as the angle between the projection of the longitudinal axis of the body on the horizontal plane (Xg–Yg) and the Xg axis; the elevation angle ({theta}) was defined as the angle between the longitudinal axis of the body and the horizontal plane (Xg–Yg); and the bank angle ({phi}) was defined as the angle between the line connecting both chest markers and the horizontal plane (Xg–Yg) (see inset). Body angles were defined as the deviation around the body-fixed axes in a body coordinate system. Arrows define the positive rotation direction of the body angles. Rotations about the body-centered XbYbZb axes were designated roll, pitch and yaw, respectively. XbYbZb, dynamic, body-based coordinate system, centered on the hip.





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