A plumb line was positioned in the background.
The starting position was standardized by placing the subject in an upright posture which was defined as a vertical pelvic position (no anterior or posterior tilt) with the assumption of a lumbar lordosis and thoracic kyphosis.23 Subjects were asked to maintain the position while they were distracted by playing the game of Solitaire on the computer for 10 minutes.
Subjects used the mouse with their dominant hand and the other hand rested motionless on the desk in front of them.