Muscle synergies reveal impaired trunk muscle coordination strategies in individuals with thoracic spinal cord injury
Muscle synergies reveal impaired trunk muscle coordination strategies in individuals with thoracic spinal cord injury
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DOI：
10.1016/j.jelekin.2017.06.007
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发表时间：
2017-10-01
影响因子：
2.5
通讯作者：
Gagnon, Dany H.
中科院分区：
文献类型：
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作者：
Milosevic, Matija;Yokoyama, Hikaru;Gagnon, Dany H.
脊髓损伤（SCI）可导致躯干肌肉瘫痪，从而影响坐姿平衡。本研究的目的是分析胸部脊髓损伤患者的躯干肌肉协调能力，并将其与身体健全者进行比较。总共招募了27名个体，并将其细分为：（a）高位胸部SCI;（B）低位胸部SCI;和（c）身体健全组。参与者坐着，并被要求将躯干向八个方向倾斜，同时记录躯干肌肉的活动。使用非负矩阵因子分解（NMF）方法提取肌肉模块（协同躯干肌肉激活）及其定向激活模式来评估肌肉协调性。我们的研究结果表明，与身体健全的人相比，SCI患者使用的肌肉模块更少，共同收缩更多，定向调整更少。这些结果表明，受损和简化的肌肉协调由于脊髓损伤后脊髓上输入的损失。观察到的SCI组内肌肉协调的变化也表明，其他机制，如痉挛和肌肉拉伸反射或个人因素，如经验和训练，有助于姿势肌肉协同作用。总的来说，肌肉协调缺陷揭示受损的神经肌肉策略，这为SCI后坐着平衡过程中躯干肌肉的康复提供了启示。(C)2017爱思唯尔有限公司版权所有
Spinal cord injury (SCI) can result in paralysis of trunk muscles, which can affect sitting balance. The objective of this study was to analyze trunk muscle coordination of individuals with thoracic SCI and compare it to able-body individuals. A total of 27 individuals were recruited and subdivided into: (a) high thoracic SCI; (b) low thoracic SCI; and (c) able-body groups. Participants were seated and asked to lean their trunk in eight directions while trunk muscle activity was recorded. Muscle coordination was assessed using the non-negative matrix factorization (NMF) method to extract muscle modules, which are the synergistic trunk muscle activations, and their directional activation patterns. Our results showed that individuals with SCI used less muscle modules, more co-contractions, and less directional tuning, compared to able-bodied people. These results suggest impaired and simplified muscle coordination due to the loss of supraspinal input after SCI. Observed variability in muscle coordination within SCI groups also suggests that other mechanisms such as spasticity and muscle stretch reflexes or individual factors such as experience and training contributed to the postural muscle synergies. Overall, muscle coordination deficits revealed impaired neuromuscular strategies which provide implications for rehabilitation of trunk muscles during sitting balance after SCI. (C) 2017 Elsevier Ltd. All rights reserved.