Objective: To document the three-dimensional (3D) kinematics of the lumbar spine and the
myoelectric activity of trunk muscles throughout the range of motion in selected tasks
performed by healthy subjects. Design: A survey of a single population. Setting: A research
laboratory in a university setting. Participants: Twenty-four men and women, university-age,
with no history of chronic lower back pain volunteered for this study. Interventions: The
selected tasks consisted of lateral bend and axial twists to the right and left plus four different …