Figure 3.

The principle of data analysis process of Vicon data for trunk flexion movement: (i) The erect sitting posture with knees in 90 degrees flexion and feet flat on the floor. For measuring flexion angle (ii-a) segments C7, S1, and the midline connecting the left knee (LK) and right knee (RK), (ii-b) an axis connecting the C7, S1 segments with a perpendicular line through the middle of the knees, (ii-c) flexion movement was performed, and angle measured in degrees (θ). The participant was allowed to take the required time to successfully and independently complete the movement. Similarly, measurements for other movements are presented in the Supplementary Materials (Supplementary Figure S1).