Figure 3. Sitting positions for measurements of dependent variables. (a) Flexed position for measurements of torque–angle relationship and isometric muscle force: Each participant was seated on a chair with the seat maximally tilted and a wedge-shaped cushion inserted between the trunk and the backrest. (b) Horizontal position for the measurements of isometric and concentric muscle force: Each participant was seated on a chair with the seat adjusted parallel to the floor and a wedge-shaped cushion inserted between the trunk and the backrest.