The effect of strict muscle stress limits on abdominal muscle force predictions for combined torsion and extension loadings.
The effect of strict muscle stress limits on abdominal muscle force predictions for combined torsion and extension loadings.
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严格的肌肉应力限制对组合扭转和伸展载荷的腹部肌肉力预测的影响。
DOI：
10.1016/0021-9290(94)00110-p
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发表时间：
1995
影响因子：
2.4
通讯作者：
Chaffin,DB
中科院分区：
文献类型：
--
作者：
Hughes,RE;Chaffin,DB
这项研究的目的是确定中枢神经系统在多大程度上激活躯干肌肉，以平衡最大的肌肉应力。建立了两个不同处理大肌肉应力的优化模型。一种模型以尽可能低的肌肉应力极限来最小化脊椎压缩力，另一种模型最小化肌肉应力的总和。确定了两种模型进行不同肌力预测的实验条件。具体地说，这些模型预测了不同的腹直肌活动水平，包括扭力和伸展力矩负荷。表面肌电信号被用来评估模型预测。选择外加载荷以确保腹直肌肌电超过30%MVC。方差分析表明，在具有90%功率的统计设计中，在p<；0.05的显著水平上，腹直肌活动不受扭转载荷的影响，这与最小化立方肌肉应力总和的模型的预测一致。因此，得出结论，在所研究的任务中，平衡最大肌肉应力不是中枢神经系统的最高目标。
The objective of this study was to determine to what extent the central nervous system activates torso muscles so as to equalize the largest muscle stresses. Two optimization models that treat large muscle stresses differently were formulated. One model minimized spinal compression force subject to the lowest possible muscle stress limit, and the other model minimized the sum of cubed muscle stresses. Experimental conditions were determined for which the two models made different muscle force predictions. Specifically, the models predicted different rectus abdominis activity levels for tasks involving torsion and extension moment loadings. Surface electromyography was used to evaluate the model predictions. Applied loads were chosen to assure that the rectus abdominis EMG exceeded 30% MVC. Analysis of variance indicated that rectus abdominis activity was not affected by torsion loading at the p < 0.05 level of significance in a statistical design having 90% power, which was consistent with the predictions of the model that minimized the sum of cubed muscle stresses. Thus, it was concluded that equalization of the largest muscles stress was not the paramount objective of the central nervous system in the tasks studied.
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影响因子：
3
作者：
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DOI：
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发表时间：
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期刊：
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影响因子：
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作者：
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作者：
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