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Three-dimensional kinematics and trunk muscle myoelectric activity in the young lumbar spine: a database
J P Peach1, C G Sutarno, S M McGill
1Musculoskeletal Research Laboratory, University of Vermont, Burlington, USA.
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.