School of Sport Science, Exercise and Health, The University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Australia; School of Physiotherapy, Curtin University, Australia.
Hum Mov Sci. 2013 Oct;32(5):1176-85. doi: 10.1016/j.humov.2012.12.011. Epub 2013 Mar 5.
The trunk muscle transversus abdominis (TrA) is thought to be controlled independently of the global trunk muscles. Methodological issues in the 1990s research such as unilateral electromyography and a limited range of arm movements justify a re-examination of this theory. The hypothesis tested is that TrA bilateral co-contraction is a typical muscle synergy during arm movement. The activity of 6 pairs of trunk and lower limb muscles was recorded using bilateral electromyography during anticipatory postural adjustments (APAs) associated with the arm movements. The integrated APA electromyographical signals were analyzed for muscle synergy using Principle Component Analysis. TrA does not typically bilaterally co-contract during arm movements (1 out of 6 participants did). APA muscle activity of all muscles during asymmetrical arm movements typically reflected a direction specific diagonal pattern incorporating a twisting motion to transfer energy from the ground up. This finding is not consistent with the hypothesis that TrA plays a unique role providing bilateral, feedforward, multidirectional stiffening of the spine. This has significant implications to the theories underlying the role of TrA in back pain and in the training of isolated bilateral co-contraction of TrA in the prophylaxis of back pain.
横突腹直肌（TrA）被认为可以独立于全身躯干肌肉进行控制。20 世纪 90 年代的研究中存在一些方法学问题，如单侧肌电图和手臂运动范围有限，这使得有理由重新检验这一理论。本研究旨在检验以下假设：在手臂运动过程中，TrA 双侧协同收缩是一种典型的肌肉协同作用。在与手臂运动相关的预期姿势调整（APAs）期间，使用双侧肌电图记录了 6 对躯干和下肢肌肉的活动。使用主成分分析（PCA）对 APA 肌电图信号进行肌肉协同分析。手臂运动过程中 TrA 通常不会双侧协同收缩（6 名参与者中有 1 名会）。在非对称手臂运动期间，所有肌肉的 APA 肌肉活动通常反映了一种特定于方向的对角线模式，其中包含扭转运动，以将能量从地面向上传递。这一发现与 TrA 在提供脊柱双侧、前馈、多方向僵硬方面发挥独特作用的假设不一致。这对 TrA 在腰痛中的作用以及在预防腰痛中训练 TrA 双侧协同收缩的理论有重要影响。
