Interaction between elastic energy utilization and active state development within the work enhancing mechanism during countermovement
Interaction between elastic energy utilization and active state development within the work enhancing mechanism during countermovement
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DOI：
10.1016/j.jelekin.2009.04.004
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发表时间：
2010-04-01
影响因子：
2.5
通讯作者：
Fukashiro, Senshi
中科院分区：
文献类型：
--
作者：
Arakawa, Hiroshi;Nagano, Akinori;Fukashiro, Senshi
本研究的目的是研究反运动中弹性能量利用与活跃状态形成时间之间的相互作用，并从定量的角度确定这些因素对提高功输出的贡献。重点研究了串联弹性单元长度变化的影响和活跃态的发展速度。建立了肌腱复合体(MTC)的Hill模型。研究了SEE长度的范围(在收缩元件的最佳长度的0.625到10倍之间)和有源状态发展速率的范围。正向动力学模拟被用来评估同心(CO)和反运动(CM)条件下身高增加的原因。模拟结果表明，对于较短的SEE肌肉，可用于活动状态发育的时间的贡献大于弹性能量利用的贡献。另一方面，弹性能量利用对SEE较长的肌肉的贡献较大。此外，由于提高了活动状态开发的速度，CM中SEE的功输出显著增加。作为结果，得到了两个主要发现。首先，定量地讨论了弹性能量利用和可用于活跃状态发展的时间如何在工作增强机制内作出贡献。其次，研究发现，弹性能量利用率和主动发展的时间在反运动过程中具有协同效应。(C)2009爱思唯尔有限公司。保留所有权利。
The purpose of this study was to investigate the interaction between elastic energy utilization and the time available for active state development during countermovement, and to determine the contributions of these factors in enhancing work output from a quantitative standpoint. Especially, we focused on the effect of length variation of the series elastic element (SEE) and the speed of active state development. A Hill-type model of the muscle tendon complex (MTC) was constructed. A range of SEE lengths (between 0.625 and 10 times the optimal length of the contractile element) and a range of active state development rates were investigated. Forward dynamics simulations were performed to evaluate the causal factors for the gain in height during concentric (CO) and countermovement (CM) conditions. Simulated outputs suggested that the contribution of the time available for active state development was larger than the contribution of elastic energy utilization for a shorter SEE muscle. On the other hand, the contribution of the elastic energy utilization was larger for a longer SEE muscle. Additionally, the work output of the SEE in CM was considerably augmented due to increasing the speed of active state development. As results, two main findings were obtained. First, a quantitative discussion was developed regarding how the elastic energy utilization and the time available for active state development are contributing within the work enhancing mechanism. Second, it was found that elastic energy utilization and the time available for active state development have a synergistic effect during countermovement. (C) 2009 Elsevier Ltd. All rights reserved.