Myofascial Loads Can Occur without Fascicle Length Changes.
Myofascial Loads Can Occur without Fascicle Length Changes.
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肌筋膜负荷可以在不改变肌筋膜长度的情况下发生。
DOI：
10.1093/icb/icy049
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发表时间：
2018
影响因子：
2.6
通讯作者：
Maas,Huub
中科院分区：
文献类型：
--
作者：
Tijs,Chris;Bernabei,Michel;vanDieën,JaapH;Maas,Huub
许多研究表明，结缔组织连接可以在协同肌肉之间传递力，这种力传递取决于这些肌肉之间的相对位置及其肌肉间结缔组织的性质。据报道，相邻肌肉的移动会导致保持恒定肌肉-肌腱单位(MTU)长度的被动肌肉(例如比目鱼肌[SO])内的纵向变形，但没有直接测量肌力。变形不提供肌肉之间传递的力的直接测量。我们结合两种不同的肌肉准备来评估相邻肌肉施加的肌筋膜负荷是否会导致SO束长度的变化。我们研究了两个关节的腓肠肌(GA)和足底(PL)肌近端MTU长度的变化对(1)完整肌室和(2)可同时测量SO肌束长度和远端肌腱张力的单关节SO肌束长度的影响。因此，将声学测量晶体植入Wistar大鼠(n=5)的肌腹中。在三种动物中，SO和GA+PL之间的连接性增强。在所有足底屈肌最大兴奋前和最大兴奋期间进行测量。在两种情况下，GA+PL的MTU长度不影响SO束的长度，在被动和主动条件下也不影响。延长GA+PL肌腱远端肌腱张力分别增加43.3-97.8%(P<； 0.001)和27.5-182.6%(P<； 0.001)。这表明，SO和协同肌肉之间的肌筋膜力传递可以通过与SO肌节系列平行的结缔组织网络进行，而SO肌束的长度没有实质性的变化。
Many studies have shown that connective tissue linkages can transmit force between synergistic muscles and that such force transmission depends on the position of these muscles relative to each other and on properties of their intermuscular connective tissues. Moving neighboring muscles has been reported to cause longitudinal deformations within passive muscles held at a constant muscle–tendon unit (MTU) length (e.g., soleus [SO]), but muscle forces were not directly measured. Deformations do not provide a direct measure of the force transmitted between muscles. We combined two different muscle preparations to assess whether myofascial loads exerted by neighboring muscles result in length changes of SO fascicles. We investigated the effects of proximal MTU length changes of two-joint gastrocnemius (GA) and plantaris (PL) muscles on the fascicle length of the one-joint SO muscle within (1) an intact muscle compartment and (2) a disrupted compartment that allowed measurements of fascicle length and distal tendon force of SO simultaneously. SO muscle bellies of Wistar rats (n=5) were implanted with sonomicrometry crystals. In three animals, connectivity between SO and GA+PL was enhanced. Measurements were performed before and during maximal excitation of all plantar flexor muscles. In both setups, MTU length of GA+PL did not affect the length of SO fascicles, neither during passive nor active conditions. However, lengthening the MTU of GA+PL increased distal tendon force of SO by 43.3–97.8% (P< 0.001) and 27.5–182.6% (P< 0.001), respectively. This indicates that substantial myofascial force transmission between SO and synergistic muscle can occur via a connective tissue network running parallel to the series of SO sarcomeres without substantial length changes of SO fascicles.