Modular control of human walking: a simulation study.
Modular control of human walking: a simulation study.
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DOI：
10.1016/j.jbiomech.2009.03.009
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发表时间：
2009-06-19
影响因子：
2.4
通讯作者：
Kautz SA
中科院分区：
文献类型：
--
作者：
Neptune RR;Clark DJ;Kautz SA
最近的证据表明，复杂的运动任务，如步行，可以通过简单的协同活动肌肉或“模块”的潜在组织来完成，这些肌肉被认为是为了执行特定任务的生物力学功能而构建的。然而，没有研究明确测试过这些模块是否真的能产生与之相关的生物力学功能，甚至是否能产生协调良好的运动。在这项研究中，我们使用肌肉激活模块（使用非负矩阵分解识别）作为肌肉控制输入，生成正常行走的肌肉驱动前向动力学模拟，以确定每个模块对行走的生物力学子任务（即身体支撑，向前推进和腿部摆动）的贡献。仿真分析表明，一个包含五个肌肉激活模块的简单神经控制策略足以完成步行的基本子任务。模块1（臀中肌、股直肌）主要作用于站立早期的身体支撑，模块2（比目鱼肌和腓肠肌）主要作用于站立后期的身体支撑和推进。模块3（股直肌和胫骨前肌）在摆动的早期和后期对腿部进行减速，同时在整个摆动过程中向躯干产生能量。模块4（腿筋）的作用是在摇摆后期吸收腿部能量（即减速），而在立姿早期增加腿部能量。事后分析揭示了一个额外的模块（模块5：髂腰肌）在摆动前和早期加速腿部向前。这些结果提供了证据，表明所识别的模块可以作为基本的神经控制元件，产生特定任务的生物力学功能，以产生协调良好的行走。
Recent evidence suggests that performance of complex locomotor tasks such as walking may be accomplished using a simple underlying organization of co-active muscles, or “modules”, which have been assumed to be structured to perform task-specific biomechanical functions. However, no study has explicitly tested whether the modules would actually produce the biomechanical functions associated with them or even produce a well-coordinated movement. In this study, we generated muscle-actuated forward dynamics simulations of normal walking using muscle activation modules (identified using non-negative matrix factorization) as the muscle control inputs to identify the contributions of each module to the biomechanical sub-tasks of walking (i.e., body support, forward propulsion and leg swing). The simulation analysis showed a simple neural control strategy involving five muscle activation modules was sufficient to perform the basic sub-tasks of walking. Module 1 (gluteus medius, vasti and rectus femoris) primarily contributed to body support in early stance while Module 2 (soleus and gastrocnemius) contributed to both body support and propulsion in late stance. Module 3 (rectus femoris and tibialis anterior) acted to decelerate the leg in early and late swing while generating energy to the trunk throughout swing. Module 4 (hamstrings) acted to absorb leg energy (i.e., decelerate it) in late swing while increasing the leg energy in early stance. Post-hoc analysis revealed an additional module (Module 5: iliopsoas) acted to accelerate the leg forward in pre- and early swing. These results provide evidence that the identified modules can act as basic neural control elements that generate task-specific biomechanical functions to produce well-coordinated walking.
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影响因子：
2.5
作者：
Tresch, MC;Cheung, VCK;d'Avella, A
通讯作者：
d'Avella, A
影响因子：
2.4
作者：
Neptune, Richard R.;Sasaki, Kotaro;Kautz, Steven A.
通讯作者：
Kautz, Steven A.
影响因子：
5.5
作者：
Ivanenko, YP;Poppele, RE;Lacquaniti, F
通讯作者：
Lacquaniti, F
影响因子：
5.3
作者：
Ivanenko, Yuri P.;Cappellini, Germana;Lacquaniti, Francesco
通讯作者：
Lacquaniti, Francesco
影响因子：
2.5
作者：
Ting, LH;Macpherson, JM
通讯作者：
Macpherson, JM