Modular control of muscle coordination patterns during various stride time and stride length combinations
Modular control of muscle coordination patterns during various stride time and stride length combinations
复制标题
各种步幅时间和步幅长度组合期间肌肉协调模式的模块化控制
DOI：
10.1016/j.gaitpost.2021.04.006
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Kouzaki Motoki
中科院分区：
文献类型：
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作者：
Kibushi Benio;Moritani Toshio;Kouzaki Motoki
背景肌肉控制中的模块化组织通常被指定为层级组织的协同肌群。关于模块化组织对步行速度的调节，关于模块化组织是否在不同步行速度之间相对一致，存在着相互矛盾的观点。这种冲突可能源于不同的步幅时间(一步的时间)和步长组合，以达到相同的步行速度。研究问题模块化组织的调节是否依赖于步幅时间和步长(步长)组合？方法10名健康男性在跑步机上以中速(无因次速度 = 0.4%)以5种不同的步长组合(极短、短、首选、长和很长)进行步行。记录躯干和下肢16块肌肉的表面肌电信号。模块化组织被建模为肌肉协同效应，代表了一组同步激活的肌肉。肌肉协同作用是用分解技术提取的。结果在偏爱和准偏爱条件下(中位数：4.5[短]、4.5[首选]、5[长])，协同作用数是一致的，而在极端条件下(中位数：4[很短]和6[很长]；0.02 ≤p≤为0.0 9)。步态参数(步态时间、步长、站立时间、摆动时间和双站立时间)在首选和准首选条件下有显著差异(p<； 0.03)。显著意义我们的结果为步行过程中模块化控制的灵活性提供了额外的见解，即即使在一个步行速度内，协同作用或激活的次数也是微调的。我们的发现表明，除了极端的步行模式外，通过一致的协同效应可以实现各种步行模式。
BackgroundModular organization in muscular control is generally specified as synergistic muscle groups that are hierarchically organized. There are conflicting perspectives regarding modular organization for regulation of walking speeds, with regard to whether modular organization is relatively consistent across walking speeds. This conflict might arise from different stride time (time for one stride) and stride length combinations for achieving the same walking speed.Research questionDoes the regulation of the modular organization depend on stride time and stride length (stride time-length) combinations?MethodsTen healthy men walked at a moderate speed (nondimensional speed = 0.4) on a treadmill at five different stride time-length combinations (very short, short, preferred, long, and very long). Surface electromyograms from 16 muscles in the trunk and lower limb were recorded. The modular organization was modeled as muscle synergies, which represent groups of synchronously activated muscles. Muscle synergies were extracted using a decomposition technique. The number of synergies and their activation durations were analyzed.ResultsThe number of synergies was consistent in the preferred and quasi-preferred condition (median: 4.5 [short], 4.5 [preferred], 5 [long]), while it varied in the extreme condition (median: 4 [very short] and 6 [very long]; 0.02 ≤p≤ 0.09). Gait parameters (stride time, stride length, stance time, swing time, and double stance time) were significantly different for preferred and quasi-preferred conditions (p< 0.03).SignificanceOur results provide additional insights on the flexibility of modular control during walking, namely that the number of synergies or activations are fine-tuned even within one walking speed. Our finding implies that a variety of walking patterns can be achieved by consistent synergies except for extreme walking patterns.