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 flexion-extension tasks that varied a hand-held weight (10kg and 0kg), and flexion-extension velocity (free-paced and 20 degrees/sec). MAIN OUTCOME MEASURE: 3D lumbar spine kinematics and normalized, linear enveloped electromyogram (EMG) of trunk muscles. RESULTS: The motion time histories were illustrated graphically. Consistent spinal kinematics and EMG activation patterns during each task across subjects were seen. Peak displacement values between tasks, using one-way analysis of variance, showed no significant difference. CONCLUSION: A database of healthy spine kinematics and normalized linear enveloped trunk muscle activation patterns were developed for future comparison of elderly and pathological subjects.
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 flexion-extension tasks that varied a hand-held weight (10kg and 0kg), and flexion-extension velocity (free-paced and 20 degrees/sec). MAIN OUTCOME MEASURE: 3D lumbar spine kinematics and normalized, linear enveloped electromyogram (EMG) of trunk muscles. RESULTS: The motion time histories were illustrated graphically. Consistent spinal kinematics and EMG activation patterns during each task across subjects were seen. Peak displacement values between tasks, using one-way analysis of variance, showed no significant difference. CONCLUSION: A database of healthy spine kinematics and normalized linear enveloped trunk muscle activation patterns were developed for future comparison of elderly and pathological subjects.
Authors: Masoud Malakoutian; C Antonio Sanchez; Stephen H M Brown; John Street; Sidney Fels; Thomas R Oxland Journal: Front Bioeng Biotechnol Date: 2022-06-02