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首页> 外文期刊>Journal of Biomechanics >Human calf muscle responses during repeated isometric plantarflexions
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Human calf muscle responses during repeated isometric plantarflexions

机译：反复等距足屈期间的小腿肌肉反应

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摘要

In the present study, we measured the contraction-induced shortening (dL) of individual synergistic human muscles in a repeated motor task to assess their contractile behaviour. Ultrasonography was used to obtain dL measurements in the gastrocnemius (GS) and soleus (SOL) muscles of six men performing 1 I consecutive isometric plantarflexions. Contractions 1 and 11 were performed with maximal effort, and contractions 2-4, 5-7 and 8-10 were performed with efforts generating 50, 70 and 90%, respectively, of the plantarflexion moment produced in contraction 1. In contractions 5-10, the SOL muscle dL was similar (p > 0.05) to that produced in contraction 1 (similar to 6mm), indicating that the SOL muscle became fully activated at 70% of the maximum plantarflexion moment. The GS muscle dL in contractions 10 and 1 1 exceeded by similar to 0.5 mm (p < 0.05) and 1.3 mm (p < 0.01), respectively, that generated in contraction 1 (similar to 10mm), despite evidence obtained by superimposed stimulation that contraction I was produced with full motor unit activation. The consequent paradox that the GS muscle would produce in contractions 10 and 11 a greater activation and therefore more force than its actual potential is resolved when considering the interaction between the time-dependent tensile response of tendon and the performance of muscle as dictated by the sliding filament mechanism of contraction. (c) 2005 Elsevier Ltd. All rights reserved.
机译：在本研究中，我们在重复的运动任务中测量了单个协同人体肌肉的收缩诱导缩短（dL），以评估其收缩行为。超声用于获得六名进行1 I连续等距ometric屈的男性腓肠肌（GS）和比目鱼肌（SOL）的dL测量值。收缩1和11的力气最大，收缩2-4、5-7和8-10的力气分别产生收缩1中产生的the屈力矩的50％，70％和90％。在收缩5中如图10所示，SOL肌肉的dL与收缩1（近似6mm）中产生的dL相似（p> 0.05），表明SOL肌肉在最大plant屈力矩的70％时被完全激活。尽管通过叠加刺激获得的证据表明，收缩10和1 1中的GS肌肉dL分别超过收缩1中（类似于10mm）产生的0.5 mm（p <0.05）和1.3 mm（p <0.01）相似。收缩I是在完全激活马达的情况下产生的。考虑到随时间变化的肌腱拉伸响应和滑动所决定的肌肉性能之间的相互作用，可以解决GS肌肉在收缩10和11中产生的随之而来的悖论，即其更大的激活力，因此比其实际潜力更大的力细丝的收缩机制。 （c）2005 Elsevier Ltd.保留所有权利。

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