Functional muscle synergies constrain force production during postural tasks
Functional muscle synergies constrain force production during postural tasks
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DOI：
10.1016/j.jbiomech.2007.09.012
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发表时间：
2008-01-01
影响因子：
2.4
通讯作者：
Ting, Lena H.
中科院分区：
文献类型：
--
作者：
McKay, J. Lucas;Ting, Lena H.
我们最近证明，一组五个功能性肌肉协同作用足以表征猫站立在多种姿势配置的自动姿势反应过程中的后肢肌肉活动和主动力量。这一特征的关键取决于假设的端点力矢量（协同力矢量）的激活产生的每个肌肉协同肢体轴旋转的后肢姿势在矢状面变化。在这里，我们使用了一个详细的，3D静态模型的后肢，以确认这一假设是生物力学合理的：当我们改变模型的姿势，模拟协同力矢量单调旋转的肢体轴在parastrophic平面（r（2）= 0.94 +/- 0.08）。然后，我们测试了使用这五种功能性肌肉协同作用的神经策略是否提供了与单独控制31块肌肉中的每一块肌肉相同的力量产生能力。我们比较了可行的力量集（FFS）的模型与肌肉协同组织。FFS体积随着肌肉协同组织的增加而显著减少（F= 1556.01，p
We recently demonstrated that a set of five functional muscle synergies were sufficient to characterize both hindlimb muscle activity and active forces during automatic postural responses in cats standing at multiple postural configurations. This characterization depended critically upon the assumption that the endpoint force vector (synergy force vector) produced by the activation of each muscle synergy rotated with the limb axis as the hindlimb posture varied in the sagittal plane. Here, we used a detailed, 3D static model of the hindlimb to confirm that this assumption is biomechanically plausible: as we varied the model posture, simulated synergy force vectors rotated monotonically with the limb axis in the parasagittal plane (r(2) = 0.94 +/- 0.08). We then tested whether a neural strategy of using these five functional muscle synergies provides the same force-generating capability as controlling each of the 31 muscles individually. We compared feasible force sets (FFSs) from the model with and without a muscle synergy organization. FFS volumes were significantly reduced with the muscle synergy organization (F= 1556.01, p