EVALUATING THE EFFECT OF COCONTRACTION IN OPTIMIZATION MODELS

被引:50
作者
HUGHES, RE [1 ]
BEAN, JC [1 ]
CHAFFIN, DB [1 ]
机构
[1] UNIV MICHIGAN,DEPT IND & OPERAT ENGN,ANN ARBOR,MI 48109
关键词
OPTIMIZATION; COCONTRACTION; SPINE; ANTAGONIST;
D O I
10.1016/0021-9290(95)95277-C
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
The effect of co-contraction of antagonist muscles on spinal compression force is estimated using Karush-Kuhn-Tucker (K-K-T) multipliers. Go-contraction is modelled as an incremental increase in the lower bounds on the allowable muscle forces in an optimization model formation. The K-K-T multipliers associated with each lower bound provide an estimate of the partial derivate of the optimal objective function value with respect to a change in the lower bound. A model whose objective function is spinal compression Force is analyzed to estimate the effect of co-contraction on spinal compression force. While the effect depends on the specific muscle and task under consideration, the marginal effect of co-contraction on spinal compression force can be as high as 5.52 N additional spinal compression force for every additional N of muscle force. Paradoxically, the co-contraction may slightly decrease predicted spinal compression in special circumstances.
引用
收藏
页码:875 / 878
页数:4
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