Effect of optimization criterion on spinal force estimates during asymmetric lifting.
Optimization-based muscle force prediction models of the lumbar region are used in research and ergonomic practice, usually as a subroutine of a job analysis software package. Various optimization criteria have been put forward for use in rationally selecting a set of muscle forces to satisfy moment equilibrium, including the sum of cubed muscle contraction intensities and a double linear programming procedure for minimizing the spinal compression force and maximum muscle contraction intensity. A laboratory study was conducted to determine whether these two model formulations produce significantly different estimates of spinal forces for a dynamic asymmetric lift. Although statistically significant differences were found between the predictions of the two models, the difference in peak spinal compression force was only 1.1%.
Hughes
R E
RE
Department of Surgery, University of Michigan, Ann Arbor 48109-0486, USA. rehughes@umich.edu
D000328:Adult; D019245:Compressive Strength; D005260:Female; D005544:Forecasting; D006801:Humans; D008161:Lumbosacral Region; D008297:Male; D009119:Muscle Contraction / Q000502:physiology; D018482:Muscle, Skeletal / Q000502:physiology; D013131:Spine / Q000502:physiology*; D014891:Weight Lifting / Q000502:physiology*