Sudden Loading During a Dynamic Lifting Task: A Simulation Study

[+] Author and Article Information
T. Bull Andersen, E. B. Simonsen

Institute of Medical Anatomy C, University of Copenhagen, Denmark

J Biomech Eng 127(1), 108-113 (Mar 08, 2005) (6 pages) doi:10.1115/1.1835357 History: Received February 19, 2004; Revised September 09, 2004; Online March 08, 2005
Copyright © 2005 by ASME
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Screenshot of the model at the time of load application. Each muscle is represented by a line and the width of the line indicates the activity in the muscle. Bone graphics is only used for illustrative purposes.
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Input to each simulation was three stimulation levels (x1-3) between 0 and 1 and two timing parameters (x4-5) between 0 s and 0.5 s or between 0.25 s and 0.5 s
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Comparison of the joint angles during a video analyzed lifting motion and the optimal simulated motion
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Objective function value (cost function or error) as a function of the external applied load
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Maximal compression in the direction of the spine at the L4L5 joint as a function of external applied load
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Optimal muscle activations during the optimal motion without external loading, and with either the application of a load corresponding to 10 kg upwards (−) or downwards (+)



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